http://git-wip-us.apache.org/repos/asf/hbase-site/blob/33bc9e06/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/FavoredStochasticBalancer.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/FavoredStochasticBalancer.html b/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/FavoredStochasticBalancer.html index b5f351a..de70e5b 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/FavoredStochasticBalancer.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/FavoredStochasticBalancer.html @@ -51,700 +51,703 @@ <span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.favored.FavoredNodesPlan;<a name="line.43"></a> <span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.favored.FavoredNodesPlan.Position;<a name="line.44"></a> <span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.favored.FavoredNodesPromoter;<a name="line.45"></a> -<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.master.MasterServices;<a name="line.46"></a> -<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.master.RegionPlan;<a name="line.47"></a> -<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.48"></a> -<span class="sourceLineNo">049</span><a name="line.49"></a> -<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Lists;<a name="line.50"></a> -<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Maps;<a name="line.51"></a> -<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Sets;<a name="line.52"></a> -<span class="sourceLineNo">053</span><a name="line.53"></a> -<span class="sourceLineNo">054</span>/**<a name="line.54"></a> -<span class="sourceLineNo">055</span> * An implementation of the {@link org.apache.hadoop.hbase.master.LoadBalancer} that<a name="line.55"></a> -<span class="sourceLineNo">056</span> * assigns favored nodes for each region. There is a Primary RegionServer that hosts<a name="line.56"></a> -<span class="sourceLineNo">057</span> * the region, and then there is Secondary and Tertiary RegionServers. Currently, the<a name="line.57"></a> -<span class="sourceLineNo">058</span> * favored nodes information is used in creating HDFS files - the Primary RegionServer<a name="line.58"></a> -<span class="sourceLineNo">059</span> * passes the primary, secondary, tertiary node addresses as hints to the<a name="line.59"></a> -<span class="sourceLineNo">060</span> * DistributedFileSystem API for creating files on the filesystem. These nodes are<a name="line.60"></a> -<span class="sourceLineNo">061</span> * treated as hints by the HDFS to place the blocks of the file. This alleviates the<a name="line.61"></a> -<span class="sourceLineNo">062</span> * problem to do with reading from remote nodes (since we can make the Secondary<a name="line.62"></a> -<span class="sourceLineNo">063</span> * RegionServer as the new Primary RegionServer) after a region is recovered. This<a name="line.63"></a> -<span class="sourceLineNo">064</span> * should help provide consistent read latencies for the regions even when their<a name="line.64"></a> -<span class="sourceLineNo">065</span> * primary region servers die. This provides two<a name="line.65"></a> -<span class="sourceLineNo">066</span> * {@link org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.CandidateGenerator}<a name="line.66"></a> -<span class="sourceLineNo">067</span> *<a name="line.67"></a> -<span class="sourceLineNo">068</span> */<a name="line.68"></a> -<span class="sourceLineNo">069</span>public class FavoredStochasticBalancer extends StochasticLoadBalancer implements<a name="line.69"></a> -<span class="sourceLineNo">070</span> FavoredNodesPromoter {<a name="line.70"></a> -<span class="sourceLineNo">071</span><a name="line.71"></a> -<span class="sourceLineNo">072</span> private static final Log LOG = LogFactory.getLog(FavoredStochasticBalancer.class);<a name="line.72"></a> -<span class="sourceLineNo">073</span> private FavoredNodesManager fnm;<a name="line.73"></a> -<span class="sourceLineNo">074</span><a name="line.74"></a> -<span class="sourceLineNo">075</span> @Override<a name="line.75"></a> -<span class="sourceLineNo">076</span> public void initialize() throws HBaseIOException {<a name="line.76"></a> -<span class="sourceLineNo">077</span> configureGenerators();<a name="line.77"></a> -<span class="sourceLineNo">078</span> super.initialize();<a name="line.78"></a> -<span class="sourceLineNo">079</span> }<a name="line.79"></a> -<span class="sourceLineNo">080</span><a name="line.80"></a> -<span class="sourceLineNo">081</span> protected void configureGenerators() {<a name="line.81"></a> -<span class="sourceLineNo">082</span> List<CandidateGenerator> fnPickers = new ArrayList<>(2);<a name="line.82"></a> -<span class="sourceLineNo">083</span> fnPickers.add(new FavoredNodeLoadPicker());<a name="line.83"></a> -<span class="sourceLineNo">084</span> fnPickers.add(new FavoredNodeLocalityPicker());<a name="line.84"></a> -<span class="sourceLineNo">085</span> setCandidateGenerators(fnPickers);<a name="line.85"></a> -<span class="sourceLineNo">086</span> }<a name="line.86"></a> -<span class="sourceLineNo">087</span><a name="line.87"></a> -<span class="sourceLineNo">088</span> @Override<a name="line.88"></a> -<span class="sourceLineNo">089</span> public void setMasterServices(MasterServices masterServices) {<a name="line.89"></a> -<span class="sourceLineNo">090</span> super.setMasterServices(masterServices);<a name="line.90"></a> -<span class="sourceLineNo">091</span> fnm = masterServices.getFavoredNodesManager();<a name="line.91"></a> -<span class="sourceLineNo">092</span> }<a name="line.92"></a> -<span class="sourceLineNo">093</span><a name="line.93"></a> -<span class="sourceLineNo">094</span> /*<a name="line.94"></a> -<span class="sourceLineNo">095</span> * Round robin assignment: Segregate the regions into two types:<a name="line.95"></a> -<span class="sourceLineNo">096</span> *<a name="line.96"></a> -<span class="sourceLineNo">097</span> * 1. The regions that have favored node assignment where at least one of the favored node<a name="line.97"></a> -<span class="sourceLineNo">098</span> * is still alive. In this case, try to adhere to the current favored nodes assignment as<a name="line.98"></a> -<span class="sourceLineNo">099</span> * much as possible - i.e., if the current primary is gone, then make the secondary or<a name="line.99"></a> -<span class="sourceLineNo">100</span> * tertiary as the new host for the region (based on their current load). Note that we don't<a name="line.100"></a> -<span class="sourceLineNo">101</span> * change the favored node assignments here (even though one or more favored node is<a name="line.101"></a> -<span class="sourceLineNo">102</span> * currently down). That will be done by the admin operations.<a name="line.102"></a> -<span class="sourceLineNo">103</span> *<a name="line.103"></a> -<span class="sourceLineNo">104</span> * 2. The regions that currently don't have favored node assignments. Generate favored nodes<a name="line.104"></a> -<span class="sourceLineNo">105</span> * for them and then assign. Generate the primary fn in round robin fashion and generate<a name="line.105"></a> -<span class="sourceLineNo">106</span> * secondary and tertiary as per favored nodes constraints.<a name="line.106"></a> -<span class="sourceLineNo">107</span> */<a name="line.107"></a> -<span class="sourceLineNo">108</span> @Override<a name="line.108"></a> -<span class="sourceLineNo">109</span> public Map<ServerName, List<HRegionInfo>> roundRobinAssignment(List<HRegionInfo> regions,<a name="line.109"></a> -<span class="sourceLineNo">110</span> List<ServerName> servers) throws HBaseIOException {<a name="line.110"></a> -<span class="sourceLineNo">111</span><a name="line.111"></a> -<span class="sourceLineNo">112</span> metricsBalancer.incrMiscInvocations();<a name="line.112"></a> -<span class="sourceLineNo">113</span><a name="line.113"></a> -<span class="sourceLineNo">114</span> Set<HRegionInfo> regionSet = Sets.newHashSet(regions);<a name="line.114"></a> -<span class="sourceLineNo">115</span> Map<ServerName, List<HRegionInfo>> assignmentMap = assignMasterRegions(regions, servers);<a name="line.115"></a> -<span class="sourceLineNo">116</span> if (assignmentMap != null && !assignmentMap.isEmpty()) {<a name="line.116"></a> -<span class="sourceLineNo">117</span> servers = new ArrayList<>(servers);<a name="line.117"></a> -<span class="sourceLineNo">118</span> // Guarantee not to put other regions on master<a name="line.118"></a> -<span class="sourceLineNo">119</span> servers.remove(masterServerName);<a name="line.119"></a> -<span class="sourceLineNo">120</span> List<HRegionInfo> masterRegions = assignmentMap.get(masterServerName);<a name="line.120"></a> -<span class="sourceLineNo">121</span> if (!masterRegions.isEmpty()) {<a name="line.121"></a> -<span class="sourceLineNo">122</span> for (HRegionInfo region: masterRegions) {<a name="line.122"></a> -<span class="sourceLineNo">123</span> regionSet.remove(region);<a name="line.123"></a> -<span class="sourceLineNo">124</span> }<a name="line.124"></a> -<span class="sourceLineNo">125</span> }<a name="line.125"></a> -<span class="sourceLineNo">126</span> }<a name="line.126"></a> -<span class="sourceLineNo">127</span><a name="line.127"></a> -<span class="sourceLineNo">128</span> if (regionSet.isEmpty()) {<a name="line.128"></a> -<span class="sourceLineNo">129</span> return assignmentMap;<a name="line.129"></a> -<span class="sourceLineNo">130</span> }<a name="line.130"></a> -<span class="sourceLineNo">131</span><a name="line.131"></a> -<span class="sourceLineNo">132</span> try {<a name="line.132"></a> -<span class="sourceLineNo">133</span> FavoredNodeAssignmentHelper helper =<a name="line.133"></a> -<span class="sourceLineNo">134</span> new FavoredNodeAssignmentHelper(servers, fnm.getRackManager());<a name="line.134"></a> -<span class="sourceLineNo">135</span> helper.initialize();<a name="line.135"></a> -<span class="sourceLineNo">136</span><a name="line.136"></a> -<span class="sourceLineNo">137</span> Set<HRegionInfo> systemRegions = FavoredNodesManager.filterNonFNApplicableRegions(regionSet);<a name="line.137"></a> -<span class="sourceLineNo">138</span> regionSet.removeAll(systemRegions);<a name="line.138"></a> -<span class="sourceLineNo">139</span><a name="line.139"></a> -<span class="sourceLineNo">140</span> // Assign all system regions<a name="line.140"></a> -<span class="sourceLineNo">141</span> Map<ServerName, List<HRegionInfo>> systemAssignments =<a name="line.141"></a> -<span class="sourceLineNo">142</span> super.roundRobinAssignment(Lists.newArrayList(systemRegions), servers);<a name="line.142"></a> -<span class="sourceLineNo">143</span><a name="line.143"></a> -<span class="sourceLineNo">144</span> // Segregate favored and non-favored nodes regions and assign accordingly.<a name="line.144"></a> -<span class="sourceLineNo">145</span> Pair<Map<ServerName,List<HRegionInfo>>, List<HRegionInfo>> segregatedRegions =<a name="line.145"></a> -<span class="sourceLineNo">146</span> segregateRegionsAndAssignRegionsWithFavoredNodes(regionSet, servers);<a name="line.146"></a> -<span class="sourceLineNo">147</span> Map<ServerName, List<HRegionInfo>> regionsWithFavoredNodesMap = segregatedRegions.getFirst();<a name="line.147"></a> -<span class="sourceLineNo">148</span> Map<ServerName, List<HRegionInfo>> regionsWithoutFN =<a name="line.148"></a> -<span class="sourceLineNo">149</span> generateFNForRegionsWithoutFN(helper, segregatedRegions.getSecond());<a name="line.149"></a> -<span class="sourceLineNo">150</span><a name="line.150"></a> -<span class="sourceLineNo">151</span> // merge the assignment maps<a name="line.151"></a> -<span class="sourceLineNo">152</span> mergeAssignmentMaps(assignmentMap, systemAssignments);<a name="line.152"></a> -<span class="sourceLineNo">153</span> mergeAssignmentMaps(assignmentMap, regionsWithFavoredNodesMap);<a name="line.153"></a> -<span class="sourceLineNo">154</span> mergeAssignmentMaps(assignmentMap, regionsWithoutFN);<a name="line.154"></a> -<span class="sourceLineNo">155</span><a name="line.155"></a> -<span class="sourceLineNo">156</span> } catch (Exception ex) {<a name="line.156"></a> -<span class="sourceLineNo">157</span> throw new HBaseIOException("Encountered exception while doing favored-nodes assignment "<a name="line.157"></a> -<span class="sourceLineNo">158</span> + ex + " Falling back to regular assignment", ex);<a name="line.158"></a> -<span class="sourceLineNo">159</span> }<a name="line.159"></a> -<span class="sourceLineNo">160</span> return assignmentMap;<a name="line.160"></a> -<span class="sourceLineNo">161</span> }<a name="line.161"></a> -<span class="sourceLineNo">162</span><a name="line.162"></a> -<span class="sourceLineNo">163</span> private void mergeAssignmentMaps(Map<ServerName, List<HRegionInfo>> assignmentMap,<a name="line.163"></a> -<span class="sourceLineNo">164</span> Map<ServerName, List<HRegionInfo>> otherAssignments) {<a name="line.164"></a> -<span class="sourceLineNo">165</span><a name="line.165"></a> -<span class="sourceLineNo">166</span> if (otherAssignments == null || otherAssignments.isEmpty()) {<a name="line.166"></a> -<span class="sourceLineNo">167</span> return;<a name="line.167"></a> -<span class="sourceLineNo">168</span> }<a name="line.168"></a> -<span class="sourceLineNo">169</span><a name="line.169"></a> -<span class="sourceLineNo">170</span> for (Entry<ServerName, List<HRegionInfo>> entry : otherAssignments.entrySet()) {<a name="line.170"></a> -<span class="sourceLineNo">171</span> ServerName sn = entry.getKey();<a name="line.171"></a> -<span class="sourceLineNo">172</span> List<HRegionInfo> regionsList = entry.getValue();<a name="line.172"></a> -<span class="sourceLineNo">173</span> if (assignmentMap.get(sn) == null) {<a name="line.173"></a> -<span class="sourceLineNo">174</span> assignmentMap.put(sn, Lists.newArrayList(regionsList));<a name="line.174"></a> -<span class="sourceLineNo">175</span> } else {<a name="line.175"></a> -<span class="sourceLineNo">176</span> assignmentMap.get(sn).addAll(regionsList);<a name="line.176"></a> -<span class="sourceLineNo">177</span> }<a name="line.177"></a> -<span class="sourceLineNo">178</span> }<a name="line.178"></a> -<span class="sourceLineNo">179</span> }<a name="line.179"></a> -<span class="sourceLineNo">180</span><a name="line.180"></a> -<span class="sourceLineNo">181</span> private Map<ServerName, List<HRegionInfo>> generateFNForRegionsWithoutFN(<a name="line.181"></a> -<span class="sourceLineNo">182</span> FavoredNodeAssignmentHelper helper, List<HRegionInfo> regions) throws IOException {<a name="line.182"></a> -<span class="sourceLineNo">183</span><a name="line.183"></a> -<span class="sourceLineNo">184</span> Map<ServerName, List<HRegionInfo>> assignmentMap = Maps.newHashMap();<a name="line.184"></a> -<span class="sourceLineNo">185</span> Map<HRegionInfo, List<ServerName>> regionsNoFNMap;<a name="line.185"></a> -<span class="sourceLineNo">186</span><a name="line.186"></a> -<span class="sourceLineNo">187</span> if (regions.size() > 0) {<a name="line.187"></a> -<span class="sourceLineNo">188</span> regionsNoFNMap = helper.generateFavoredNodesRoundRobin(assignmentMap, regions);<a name="line.188"></a> -<span class="sourceLineNo">189</span> fnm.updateFavoredNodes(regionsNoFNMap);<a name="line.189"></a> -<span class="sourceLineNo">190</span> }<a name="line.190"></a> -<span class="sourceLineNo">191</span> return assignmentMap;<a name="line.191"></a> -<span class="sourceLineNo">192</span> }<a name="line.192"></a> -<span class="sourceLineNo">193</span><a name="line.193"></a> -<span class="sourceLineNo">194</span> /*<a name="line.194"></a> -<span class="sourceLineNo">195</span> * Return a pair - one with assignments when favored nodes are present and another with regions<a name="line.195"></a> -<span class="sourceLineNo">196</span> * without favored nodes.<a name="line.196"></a> -<span class="sourceLineNo">197</span> */<a name="line.197"></a> -<span class="sourceLineNo">198</span> private Pair<Map<ServerName, List<HRegionInfo>>, List<HRegionInfo>><a name="line.198"></a> -<span class="sourceLineNo">199</span> segregateRegionsAndAssignRegionsWithFavoredNodes(Collection<HRegionInfo> regions,<a name="line.199"></a> -<span class="sourceLineNo">200</span> List<ServerName> onlineServers) throws HBaseIOException {<a name="line.200"></a> -<span class="sourceLineNo">201</span><a name="line.201"></a> -<span class="sourceLineNo">202</span> // Since we expect FN to be present most of the time, lets create map with same size<a name="line.202"></a> -<span class="sourceLineNo">203</span> Map<ServerName, List<HRegionInfo>> assignmentMapForFavoredNodes =<a name="line.203"></a> -<span class="sourceLineNo">204</span> new HashMap<>(onlineServers.size());<a name="line.204"></a> -<span class="sourceLineNo">205</span> List<HRegionInfo> regionsWithNoFavoredNodes = new ArrayList<>();<a name="line.205"></a> -<span class="sourceLineNo">206</span><a name="line.206"></a> -<span class="sourceLineNo">207</span> for (HRegionInfo region : regions) {<a name="line.207"></a> -<span class="sourceLineNo">208</span> List<ServerName> favoredNodes = fnm.getFavoredNodes(region);<a name="line.208"></a> -<span class="sourceLineNo">209</span> ServerName primaryHost = null;<a name="line.209"></a> -<span class="sourceLineNo">210</span> ServerName secondaryHost = null;<a name="line.210"></a> -<span class="sourceLineNo">211</span> ServerName tertiaryHost = null;<a name="line.211"></a> -<span class="sourceLineNo">212</span><a name="line.212"></a> -<span class="sourceLineNo">213</span> if (favoredNodes != null && !favoredNodes.isEmpty()) {<a name="line.213"></a> -<span class="sourceLineNo">214</span> for (ServerName s : favoredNodes) {<a name="line.214"></a> -<span class="sourceLineNo">215</span> ServerName serverWithLegitStartCode = getServerFromFavoredNode(onlineServers, s);<a name="line.215"></a> -<span class="sourceLineNo">216</span> if (serverWithLegitStartCode != null) {<a name="line.216"></a> -<span class="sourceLineNo">217</span> FavoredNodesPlan.Position position =<a name="line.217"></a> -<span class="sourceLineNo">218</span> FavoredNodesPlan.getFavoredServerPosition(favoredNodes, s);<a name="line.218"></a> -<span class="sourceLineNo">219</span> if (Position.PRIMARY.equals(position)) {<a name="line.219"></a> -<span class="sourceLineNo">220</span> primaryHost = serverWithLegitStartCode;<a name="line.220"></a> -<span class="sourceLineNo">221</span> } else if (Position.SECONDARY.equals(position)) {<a name="line.221"></a> -<span class="sourceLineNo">222</span> secondaryHost = serverWithLegitStartCode;<a name="line.222"></a> -<span class="sourceLineNo">223</span> } else if (Position.TERTIARY.equals(position)) {<a name="line.223"></a> -<span class="sourceLineNo">224</span> tertiaryHost = serverWithLegitStartCode;<a name="line.224"></a> -<span class="sourceLineNo">225</span> }<a name="line.225"></a> -<span class="sourceLineNo">226</span> }<a name="line.226"></a> -<span class="sourceLineNo">227</span> }<a name="line.227"></a> -<span class="sourceLineNo">228</span> assignRegionToAvailableFavoredNode(assignmentMapForFavoredNodes, region, primaryHost,<a name="line.228"></a> -<span class="sourceLineNo">229</span> secondaryHost, tertiaryHost);<a name="line.229"></a> -<span class="sourceLineNo">230</span> } else {<a name="line.230"></a> -<span class="sourceLineNo">231</span> regionsWithNoFavoredNodes.add(region);<a name="line.231"></a> -<span class="sourceLineNo">232</span> }<a name="line.232"></a> -<span class="sourceLineNo">233</span> }<a name="line.233"></a> -<span class="sourceLineNo">234</span> return new Pair<>(assignmentMapForFavoredNodes, regionsWithNoFavoredNodes);<a name="line.234"></a> -<span class="sourceLineNo">235</span> }<a name="line.235"></a> -<span class="sourceLineNo">236</span><a name="line.236"></a> -<span class="sourceLineNo">237</span> private void addRegionToMap(Map<ServerName, List<HRegionInfo>> assignmentMapForFavoredNodes,<a name="line.237"></a> -<span class="sourceLineNo">238</span> HRegionInfo region, ServerName host) {<a name="line.238"></a> -<span class="sourceLineNo">239</span><a name="line.239"></a> -<span class="sourceLineNo">240</span> List<HRegionInfo> regionsOnServer;<a name="line.240"></a> -<span class="sourceLineNo">241</span> if ((regionsOnServer = assignmentMapForFavoredNodes.get(host)) == null) {<a name="line.241"></a> -<span class="sourceLineNo">242</span> regionsOnServer = Lists.newArrayList();<a name="line.242"></a> -<span class="sourceLineNo">243</span> assignmentMapForFavoredNodes.put(host, regionsOnServer);<a name="line.243"></a> -<span class="sourceLineNo">244</span> }<a name="line.244"></a> -<span class="sourceLineNo">245</span> regionsOnServer.add(region);<a name="line.245"></a> -<span class="sourceLineNo">246</span> }<a name="line.246"></a> -<span class="sourceLineNo">247</span><a name="line.247"></a> -<span class="sourceLineNo">248</span> /*<a name="line.248"></a> -<span class="sourceLineNo">249</span> * Get the ServerName for the FavoredNode. Since FN's startcode is -1, we could want to get the<a name="line.249"></a> -<span class="sourceLineNo">250</span> * ServerName with the correct start code from the list of provided servers.<a name="line.250"></a> -<span class="sourceLineNo">251</span> */<a name="line.251"></a> -<span class="sourceLineNo">252</span> private ServerName getServerFromFavoredNode(List<ServerName> servers, ServerName fn) {<a name="line.252"></a> -<span class="sourceLineNo">253</span> for (ServerName server : servers) {<a name="line.253"></a> -<span class="sourceLineNo">254</span> if (ServerName.isSameHostnameAndPort(fn, server)) {<a name="line.254"></a> -<span class="sourceLineNo">255</span> return server;<a name="line.255"></a> -<span class="sourceLineNo">256</span> }<a name="line.256"></a> -<span class="sourceLineNo">257</span> }<a name="line.257"></a> -<span class="sourceLineNo">258</span> return null;<a name="line.258"></a> -<span class="sourceLineNo">259</span> }<a name="line.259"></a> -<span class="sourceLineNo">260</span><a name="line.260"></a> -<span class="sourceLineNo">261</span> /*<a name="line.261"></a> -<span class="sourceLineNo">262</span> * Assign the region to primary if its available. If both secondary and tertiary are available,<a name="line.262"></a> -<span class="sourceLineNo">263</span> * assign to the host which has less load. Else assign to secondary or tertiary whichever is<a name="line.263"></a> -<span class="sourceLineNo">264</span> * available (in that order).<a name="line.264"></a> -<span class="sourceLineNo">265</span> */<a name="line.265"></a> -<span class="sourceLineNo">266</span> private void assignRegionToAvailableFavoredNode(<a name="line.266"></a> -<span class="sourceLineNo">267</span> Map<ServerName, List<HRegionInfo>> assignmentMapForFavoredNodes, HRegionInfo region,<a name="line.267"></a> -<span class="sourceLineNo">268</span> ServerName primaryHost, ServerName secondaryHost, ServerName tertiaryHost) {<a name="line.268"></a> -<span class="sourceLineNo">269</span><a name="line.269"></a> -<span class="sourceLineNo">270</span> if (primaryHost != null) {<a name="line.270"></a> -<span class="sourceLineNo">271</span> addRegionToMap(assignmentMapForFavoredNodes, region, primaryHost);<a name="line.271"></a> -<span class="sourceLineNo">272</span><a name="line.272"></a> -<span class="sourceLineNo">273</span> } else if (secondaryHost != null && tertiaryHost != null) {<a name="line.273"></a> -<span class="sourceLineNo">274</span><a name="line.274"></a> -<span class="sourceLineNo">275</span> // Assign the region to the one with a lower load (both have the desired hdfs blocks)<a name="line.275"></a> -<span class="sourceLineNo">276</span> ServerName s;<a name="line.276"></a> -<span class="sourceLineNo">277</span> ServerLoad tertiaryLoad = super.services.getServerManager().getLoad(tertiaryHost);<a name="line.277"></a> -<span class="sourceLineNo">278</span> ServerLoad secondaryLoad = super.services.getServerManager().getLoad(secondaryHost);<a name="line.278"></a> -<span class="sourceLineNo">279</span> if (secondaryLoad != null && tertiaryLoad != null) {<a name="line.279"></a> -<span class="sourceLineNo">280</span> if (secondaryLoad.getLoad() < tertiaryLoad.getLoad()) {<a name="line.280"></a> -<span class="sourceLineNo">281</span> s = secondaryHost;<a name="line.281"></a> -<span class="sourceLineNo">282</span> } else {<a name="line.282"></a> -<span class="sourceLineNo">283</span> s = tertiaryHost;<a name="line.283"></a> -<span class="sourceLineNo">284</span> }<a name="line.284"></a> -<span class="sourceLineNo">285</span> } else {<a name="line.285"></a> -<span class="sourceLineNo">286</span> // We don't have one/more load, lets just choose a random node<a name="line.286"></a> -<span class="sourceLineNo">287</span> s = RANDOM.nextBoolean() ? secondaryHost : tertiaryHost;<a name="line.287"></a> -<span class="sourceLineNo">288</span> }<a name="line.288"></a> -<span class="sourceLineNo">289</span> addRegionToMap(assignmentMapForFavoredNodes, region, s);<a name="line.289"></a> -<span class="sourceLineNo">290</span> } else if (secondaryHost != null) {<a name="line.290"></a> -<span class="sourceLineNo">291</span> addRegionToMap(assignmentMapForFavoredNodes, region, secondaryHost);<a name="line.291"></a> -<span class="sourceLineNo">292</span> } else if (tertiaryHost != null) {<a name="line.292"></a> -<span class="sourceLineNo">293</span> addRegionToMap(assignmentMapForFavoredNodes, region, tertiaryHost);<a name="line.293"></a> -<span class="sourceLineNo">294</span> } else {<a name="line.294"></a> -<span class="sourceLineNo">295</span> // No favored nodes are online, lets assign to BOGUS server<a name="line.295"></a> -<span class="sourceLineNo">296</span> addRegionToMap(assignmentMapForFavoredNodes, region, BOGUS_SERVER_NAME);<a name="line.296"></a> -<span class="sourceLineNo">297</span> }<a name="line.297"></a> -<span class="sourceLineNo">298</span> }<a name="line.298"></a> -<span class="sourceLineNo">299</span><a name="line.299"></a> -<span class="sourceLineNo">300</span> /*<a name="line.300"></a> -<span class="sourceLineNo">301</span> * If we have favored nodes for a region, we will return one of the FN as destination. If<a name="line.301"></a> -<span class="sourceLineNo">302</span> * favored nodes are not present for a region, we will generate and return one of the FN as<a name="line.302"></a> -<span class="sourceLineNo">303</span> * destination. If we can't generate anything, lets fallback.<a name="line.303"></a> -<span class="sourceLineNo">304</span> */<a name="line.304"></a> -<span class="sourceLineNo">305</span> @Override<a name="line.305"></a> -<span class="sourceLineNo">306</span> public ServerName randomAssignment(HRegionInfo regionInfo, List<ServerName> servers)<a name="line.306"></a> -<span class="sourceLineNo">307</span> throws HBaseIOException {<a name="line.307"></a> -<span class="sourceLineNo">308</span><a name="line.308"></a> -<span class="sourceLineNo">309</span> if (servers != null && servers.contains(masterServerName)) {<a name="line.309"></a> -<span class="sourceLineNo">310</span> if (shouldBeOnMaster(regionInfo)) {<a name="line.310"></a> -<span class="sourceLineNo">311</span> metricsBalancer.incrMiscInvocations();<a name="line.311"></a> -<span class="sourceLineNo">312</span> return masterServerName;<a name="line.312"></a> -<span class="sourceLineNo">313</span> }<a name="line.313"></a> -<span class="sourceLineNo">314</span> servers = new ArrayList<>(servers);<a name="line.314"></a> -<span class="sourceLineNo">315</span> // Guarantee not to put other regions on master<a name="line.315"></a> -<span class="sourceLineNo">316</span> servers.remove(masterServerName);<a name="line.316"></a> -<span class="sourceLineNo">317</span> }<a name="line.317"></a> -<span class="sourceLineNo">318</span><a name="line.318"></a> -<span class="sourceLineNo">319</span> ServerName destination = null;<a name="line.319"></a> -<span class="sourceLineNo">320</span> if (!FavoredNodesManager.isFavoredNodeApplicable(regionInfo)) {<a name="line.320"></a> -<span class="sourceLineNo">321</span> return super.randomAssignment(regionInfo, servers);<a name="line.321"></a> -<span class="sourceLineNo">322</span> }<a name="line.322"></a> -<span class="sourceLineNo">323</span><a name="line.323"></a> -<span class="sourceLineNo">324</span> metricsBalancer.incrMiscInvocations();<a name="line.324"></a> -<span class="sourceLineNo">325</span><a name="line.325"></a> -<span class="sourceLineNo">326</span> List<ServerName> favoredNodes = fnm.getFavoredNodes(regionInfo);<a name="line.326"></a> -<span class="sourceLineNo">327</span> if (favoredNodes == null || favoredNodes.isEmpty()) {<a name="line.327"></a> -<span class="sourceLineNo">328</span> // Generate new favored nodes and return primary<a name="line.328"></a> -<span class="sourceLineNo">329</span> FavoredNodeAssignmentHelper helper = new FavoredNodeAssignmentHelper(servers, getConf());<a name="line.329"></a> -<span class="sourceLineNo">330</span> helper.initialize();<a name="line.330"></a> -<span class="sourceLineNo">331</span> try {<a name="line.331"></a> -<span class="sourceLineNo">332</span> favoredNodes = helper.generateFavoredNodes(regionInfo);<a name="line.332"></a> -<span class="sourceLineNo">333</span> updateFavoredNodesForRegion(regionInfo, favoredNodes);<a name="line.333"></a> -<span class="sourceLineNo">334</span><a name="line.334"></a> -<span class="sourceLineNo">335</span> } catch (IOException e) {<a name="line.335"></a> -<span class="sourceLineNo">336</span> LOG.warn("Encountered exception while doing favored-nodes (random)assignment " + e);<a name="line.336"></a> -<span class="sourceLineNo">337</span> throw new HBaseIOException(e);<a name="line.337"></a> -<span class="sourceLineNo">338</span> }<a name="line.338"></a> -<span class="sourceLineNo">339</span> }<a name="line.339"></a> -<span class="sourceLineNo">340</span><a name="line.340"></a> -<span class="sourceLineNo">341</span> List<ServerName> onlineServers = getOnlineFavoredNodes(servers, favoredNodes);<a name="line.341"></a> -<span class="sourceLineNo">342</span> if (onlineServers.size() > 0) {<a name="line.342"></a> -<span class="sourceLineNo">343</span> destination = onlineServers.get(RANDOM.nextInt(onlineServers.size()));<a name="line.343"></a> -<span class="sourceLineNo">344</span> }<a name="line.344"></a> -<span class="sourceLineNo">345</span><a name="line.345"></a> -<span class="sourceLineNo">346</span> boolean alwaysAssign = getConf().getBoolean(FAVORED_ALWAYS_ASSIGN_REGIONS, true);<a name="line.346"></a> -<span class="sourceLineNo">347</span> if (destination == null && alwaysAssign) {<a name="line.347"></a> -<span class="sourceLineNo">348</span> LOG.warn("Can't generate FN for region: " + regionInfo + " falling back");<a name="line.348"></a> -<span class="sourceLineNo">349</span> destination = super.randomAssignment(regionInfo, servers);<a name="line.349"></a> -<span class="sourceLineNo">350</span> }<a name="line.350"></a> -<span class="sourceLineNo">351</span> return destination;<a name="line.351"></a> -<span class="sourceLineNo">352</span> }<a name="line.352"></a> -<span class="sourceLineNo">353</span><a name="line.353"></a> -<span class="sourceLineNo">354</span> private void updateFavoredNodesForRegion(HRegionInfo regionInfo, List<ServerName> newFavoredNodes)<a name="line.354"></a> -<span class="sourceLineNo">355</span> throws IOException {<a name="line.355"></a> -<span class="sourceLineNo">356</span> Map<HRegionInfo, List<ServerName>> regionFNMap = Maps.newHashMap();<a name="line.356"></a> -<span class="sourceLineNo">357</span> regionFNMap.put(regionInfo, newFavoredNodes);<a name="line.357"></a> -<span class="sourceLineNo">358</span> fnm.updateFavoredNodes(regionFNMap);<a name="line.358"></a> -<span class="sourceLineNo">359</span> }<a name="line.359"></a> -<span class="sourceLineNo">360</span><a name="line.360"></a> -<span class="sourceLineNo">361</span> /*<a name="line.361"></a> -<span class="sourceLineNo">362</span> * Reuse BaseLoadBalancer's retainAssignment, but generate favored nodes when its missing.<a name="line.362"></a> -<span class="sourceLineNo">363</span> */<a name="line.363"></a> -<span class="sourceLineNo">364</span> @Override<a name="line.364"></a> -<span class="sourceLineNo">365</span> public Map<ServerName, List<HRegionInfo>> retainAssignment(Map<HRegionInfo, ServerName> regions,<a name="line.365"></a> -<span class="sourceLineNo">366</span> List<ServerName> servers) throws HBaseIOException {<a name="line.366"></a> -<span class="sourceLineNo">367</span><a name="line.367"></a> -<span class="sourceLineNo">368</span> Map<ServerName, List<HRegionInfo>> assignmentMap = Maps.newHashMap();<a name="line.368"></a> -<span class="sourceLineNo">369</span> Map<ServerName, List<HRegionInfo>> result = super.retainAssignment(regions, servers);<a name="line.369"></a> -<span class="sourceLineNo">370</span> if (result == null || result.isEmpty()) {<a name="line.370"></a> -<span class="sourceLineNo">371</span> LOG.warn("Nothing to assign to, probably no servers or no regions");<a name="line.371"></a> -<span class="sourceLineNo">372</span> return null;<a name="line.372"></a> -<span class="sourceLineNo">373</span> }<a name="line.373"></a> -<span class="sourceLineNo">374</span><a name="line.374"></a> -<span class="sourceLineNo">375</span> // Guarantee not to put other regions on master<a name="line.375"></a> -<span class="sourceLineNo">376</span> if (servers != null && servers.contains(masterServerName)) {<a name="line.376"></a> -<span class="sourceLineNo">377</span> servers = new ArrayList<>(servers);<a name="line.377"></a> -<span class="sourceLineNo">378</span> servers.remove(masterServerName);<a name="line.378"></a> -<span class="sourceLineNo">379</span> }<a name="line.379"></a> -<span class="sourceLineNo">380</span><a name="line.380"></a> -<span class="sourceLineNo">381</span> // Lets check if favored nodes info is in META, if not generate now.<a name="line.381"></a> -<span class="sourceLineNo">382</span> FavoredNodeAssignmentHelper helper = new FavoredNodeAssignmentHelper(servers, getConf());<a name="line.382"></a> -<span class="sourceLineNo">383</span> helper.initialize();<a name="line.383"></a> -<span class="sourceLineNo">384</span><a name="line.384"></a> -<span class="sourceLineNo">385</span> LOG.debug("Generating favored nodes for regions missing them.");<a name="line.385"></a> -<span class="sourceLineNo">386</span> Map<HRegionInfo, List<ServerName>> regionFNMap = Maps.newHashMap();<a name="line.386"></a> +<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.master.LoadBalancer;<a name="line.46"></a> +<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.master.MasterServices;<a name="line.47"></a> +<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.master.RegionPlan;<a name="line.48"></a> +<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.49"></a> +<span class="sourceLineNo">050</span><a name="line.50"></a> +<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Lists;<a name="line.51"></a> +<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Maps;<a name="line.52"></a> +<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Sets;<a name="line.53"></a> +<span class="sourceLineNo">054</span><a name="line.54"></a> +<span class="sourceLineNo">055</span>/**<a name="line.55"></a> +<span class="sourceLineNo">056</span> * An implementation of the {@link org.apache.hadoop.hbase.master.LoadBalancer} that<a name="line.56"></a> +<span class="sourceLineNo">057</span> * assigns favored nodes for each region. There is a Primary RegionServer that hosts<a name="line.57"></a> +<span class="sourceLineNo">058</span> * the region, and then there is Secondary and Tertiary RegionServers. Currently, the<a name="line.58"></a> +<span class="sourceLineNo">059</span> * favored nodes information is used in creating HDFS files - the Primary RegionServer<a name="line.59"></a> +<span class="sourceLineNo">060</span> * passes the primary, secondary, tertiary node addresses as hints to the<a name="line.60"></a> +<span class="sourceLineNo">061</span> * DistributedFileSystem API for creating files on the filesystem. These nodes are<a name="line.61"></a> +<span class="sourceLineNo">062</span> * treated as hints by the HDFS to place the blocks of the file. This alleviates the<a name="line.62"></a> +<span class="sourceLineNo">063</span> * problem to do with reading from remote nodes (since we can make the Secondary<a name="line.63"></a> +<span class="sourceLineNo">064</span> * RegionServer as the new Primary RegionServer) after a region is recovered. This<a name="line.64"></a> +<span class="sourceLineNo">065</span> * should help provide consistent read latencies for the regions even when their<a name="line.65"></a> +<span class="sourceLineNo">066</span> * primary region servers die. This provides two<a name="line.66"></a> +<span class="sourceLineNo">067</span> * {@link org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.CandidateGenerator}<a name="line.67"></a> +<span class="sourceLineNo">068</span> *<a name="line.68"></a> +<span class="sourceLineNo">069</span> */<a name="line.69"></a> +<span class="sourceLineNo">070</span>public class FavoredStochasticBalancer extends StochasticLoadBalancer implements<a name="line.70"></a> +<span class="sourceLineNo">071</span> FavoredNodesPromoter {<a name="line.71"></a> +<span class="sourceLineNo">072</span><a name="line.72"></a> +<span class="sourceLineNo">073</span> private static final Log LOG = LogFactory.getLog(FavoredStochasticBalancer.class);<a name="line.73"></a> +<span class="sourceLineNo">074</span> private FavoredNodesManager fnm;<a name="line.74"></a> +<span class="sourceLineNo">075</span><a name="line.75"></a> +<span class="sourceLineNo">076</span> @Override<a name="line.76"></a> +<span class="sourceLineNo">077</span> public void initialize() throws HBaseIOException {<a name="line.77"></a> +<span class="sourceLineNo">078</span> configureGenerators();<a name="line.78"></a> +<span class="sourceLineNo">079</span> super.initialize();<a name="line.79"></a> +<span class="sourceLineNo">080</span> }<a name="line.80"></a> +<span class="sourceLineNo">081</span><a name="line.81"></a> +<span class="sourceLineNo">082</span> protected void configureGenerators() {<a name="line.82"></a> +<span class="sourceLineNo">083</span> List<CandidateGenerator> fnPickers = new ArrayList<>(2);<a name="line.83"></a> +<span class="sourceLineNo">084</span> fnPickers.add(new FavoredNodeLoadPicker());<a name="line.84"></a> +<span class="sourceLineNo">085</span> fnPickers.add(new FavoredNodeLocalityPicker());<a name="line.85"></a> +<span class="sourceLineNo">086</span> setCandidateGenerators(fnPickers);<a name="line.86"></a> +<span class="sourceLineNo">087</span> }<a name="line.87"></a> +<span class="sourceLineNo">088</span><a name="line.88"></a> +<span class="sourceLineNo">089</span> @Override<a name="line.89"></a> +<span class="sourceLineNo">090</span> public void setMasterServices(MasterServices masterServices) {<a name="line.90"></a> +<span class="sourceLineNo">091</span> super.setMasterServices(masterServices);<a name="line.91"></a> +<span class="sourceLineNo">092</span> fnm = masterServices.getFavoredNodesManager();<a name="line.92"></a> +<span class="sourceLineNo">093</span> }<a name="line.93"></a> +<span class="sourceLineNo">094</span><a name="line.94"></a> +<span class="sourceLineNo">095</span> /*<a name="line.95"></a> +<span class="sourceLineNo">096</span> * Round robin assignment: Segregate the regions into two types:<a name="line.96"></a> +<span class="sourceLineNo">097</span> *<a name="line.97"></a> +<span class="sourceLineNo">098</span> * 1. The regions that have favored node assignment where at least one of the favored node<a name="line.98"></a> +<span class="sourceLineNo">099</span> * is still alive. In this case, try to adhere to the current favored nodes assignment as<a name="line.99"></a> +<span class="sourceLineNo">100</span> * much as possible - i.e., if the current primary is gone, then make the secondary or<a name="line.100"></a> +<span class="sourceLineNo">101</span> * tertiary as the new host for the region (based on their current load). Note that we don't<a name="line.101"></a> +<span class="sourceLineNo">102</span> * change the favored node assignments here (even though one or more favored node is<a name="line.102"></a> +<span class="sourceLineNo">103</span> * currently down). That will be done by the admin operations.<a name="line.103"></a> +<span class="sourceLineNo">104</span> *<a name="line.104"></a> +<span class="sourceLineNo">105</span> * 2. The regions that currently don't have favored node assignments. Generate favored nodes<a name="line.105"></a> +<span class="sourceLineNo">106</span> * for them and then assign. Generate the primary fn in round robin fashion and generate<a name="line.106"></a> +<span class="sourceLineNo">107</span> * secondary and tertiary as per favored nodes constraints.<a name="line.107"></a> +<span class="sourceLineNo">108</span> */<a name="line.108"></a> +<span class="sourceLineNo">109</span> @Override<a name="line.109"></a> +<span class="sourceLineNo">110</span> public Map<ServerName, List<HRegionInfo>> roundRobinAssignment(List<HRegionInfo> regions,<a name="line.110"></a> +<span class="sourceLineNo">111</span> List<ServerName> servers) throws HBaseIOException {<a name="line.111"></a> +<span class="sourceLineNo">112</span><a name="line.112"></a> +<span class="sourceLineNo">113</span> metricsBalancer.incrMiscInvocations();<a name="line.113"></a> +<span class="sourceLineNo">114</span><a name="line.114"></a> +<span class="sourceLineNo">115</span> Set<HRegionInfo> regionSet = Sets.newHashSet(regions);<a name="line.115"></a> +<span class="sourceLineNo">116</span> Map<ServerName, List<HRegionInfo>> assignmentMap = assignMasterSystemRegions(regions, servers);<a name="line.116"></a> +<span class="sourceLineNo">117</span> if (assignmentMap != null && !assignmentMap.isEmpty()) {<a name="line.117"></a> +<span class="sourceLineNo">118</span> servers = new ArrayList<>(servers);<a name="line.118"></a> +<span class="sourceLineNo">119</span> // Guarantee not to put other regions on master<a name="line.119"></a> +<span class="sourceLineNo">120</span> servers.remove(masterServerName);<a name="line.120"></a> +<span class="sourceLineNo">121</span> List<HRegionInfo> masterRegions = assignmentMap.get(masterServerName);<a name="line.121"></a> +<span class="sourceLineNo">122</span> if (!masterRegions.isEmpty()) {<a name="line.122"></a> +<span class="sourceLineNo">123</span> for (HRegionInfo region: masterRegions) {<a name="line.123"></a> +<span class="sourceLineNo">124</span> regionSet.remove(region);<a name="line.124"></a> +<span class="sourceLineNo">125</span> }<a name="line.125"></a> +<span class="sourceLineNo">126</span> }<a name="line.126"></a> +<span class="sourceLineNo">127</span> }<a name="line.127"></a> +<span class="sourceLineNo">128</span><a name="line.128"></a> +<span class="sourceLineNo">129</span> if (regionSet.isEmpty()) {<a name="line.129"></a> +<span class="sourceLineNo">130</span> return assignmentMap;<a name="line.130"></a> +<span class="sourceLineNo">131</span> }<a name="line.131"></a> +<span class="sourceLineNo">132</span><a name="line.132"></a> +<span class="sourceLineNo">133</span> try {<a name="line.133"></a> +<span class="sourceLineNo">134</span> FavoredNodeAssignmentHelper helper =<a name="line.134"></a> +<span class="sourceLineNo">135</span> new FavoredNodeAssignmentHelper(servers, fnm.getRackManager());<a name="line.135"></a> +<span class="sourceLineNo">136</span> helper.initialize();<a name="line.136"></a> +<span class="sourceLineNo">137</span><a name="line.137"></a> +<span class="sourceLineNo">138</span> Set<HRegionInfo> systemRegions = FavoredNodesManager.filterNonFNApplicableRegions(regionSet);<a name="line.138"></a> +<span class="sourceLineNo">139</span> regionSet.removeAll(systemRegions);<a name="line.139"></a> +<span class="sourceLineNo">140</span><a name="line.140"></a> +<span class="sourceLineNo">141</span> // Assign all system regions<a name="line.141"></a> +<span class="sourceLineNo">142</span> Map<ServerName, List<HRegionInfo>> systemAssignments =<a name="line.142"></a> +<span class="sourceLineNo">143</span> super.roundRobinAssignment(Lists.newArrayList(systemRegions), servers);<a name="line.143"></a> +<span class="sourceLineNo">144</span><a name="line.144"></a> +<span class="sourceLineNo">145</span> // Segregate favored and non-favored nodes regions and assign accordingly.<a name="line.145"></a> +<span class="sourceLineNo">146</span> Pair<Map<ServerName,List<HRegionInfo>>, List<HRegionInfo>> segregatedRegions =<a name="line.146"></a> +<span class="sourceLineNo">147</span> segregateRegionsAndAssignRegionsWithFavoredNodes(regionSet, servers);<a name="line.147"></a> +<span class="sourceLineNo">148</span> Map<ServerName, List<HRegionInfo>> regionsWithFavoredNodesMap = segregatedRegions.getFirst();<a name="line.148"></a> +<span class="sourceLineNo">149</span> Map<ServerName, List<HRegionInfo>> regionsWithoutFN =<a name="line.149"></a> +<span class="sourceLineNo">150</span> generateFNForRegionsWithoutFN(helper, segregatedRegions.getSecond());<a name="line.150"></a> +<span class="sourceLineNo">151</span><a name="line.151"></a> +<span class="sourceLineNo">152</span> // merge the assignment maps<a name="line.152"></a> +<span class="sourceLineNo">153</span> mergeAssignmentMaps(assignmentMap, systemAssignments);<a name="line.153"></a> +<span class="sourceLineNo">154</span> mergeAssignmentMaps(assignmentMap, regionsWithFavoredNodesMap);<a name="line.154"></a> +<span class="sourceLineNo">155</span> mergeAssignmentMaps(assignmentMap, regionsWithoutFN);<a name="line.155"></a> +<span class="sourceLineNo">156</span><a name="line.156"></a> +<span class="sourceLineNo">157</span> } catch (Exception ex) {<a name="line.157"></a> +<span class="sourceLineNo">158</span> throw new HBaseIOException("Encountered exception while doing favored-nodes assignment "<a name="line.158"></a> +<span class="sourceLineNo">159</span> + ex + " Falling back to regular assignment", ex);<a name="line.159"></a> +<span class="sourceLineNo">160</span> }<a name="line.160"></a> +<span class="sourceLineNo">161</span> return assignmentMap;<a name="line.161"></a> +<span class="sourceLineNo">162</span> }<a name="line.162"></a> +<span class="sourceLineNo">163</span><a name="line.163"></a> +<span class="sourceLineNo">164</span> private void mergeAssignmentMaps(Map<ServerName, List<HRegionInfo>> assignmentMap,<a name="line.164"></a> +<span class="sourceLineNo">165</span> Map<ServerName, List<HRegionInfo>> otherAssignments) {<a name="line.165"></a> +<span class="sourceLineNo">166</span><a name="line.166"></a> +<span class="sourceLineNo">167</span> if (otherAssignments == null || otherAssignments.isEmpty()) {<a name="line.167"></a> +<span class="sourceLineNo">168</span> return;<a name="line.168"></a> +<span class="sourceLineNo">169</span> }<a name="line.169"></a> +<span class="sourceLineNo">170</span><a name="line.170"></a> +<span class="sourceLineNo">171</span> for (Entry<ServerName, List<HRegionInfo>> entry : otherAssignments.entrySet()) {<a name="line.171"></a> +<span class="sourceLineNo">172</span> ServerName sn = entry.getKey();<a name="line.172"></a> +<span class="sourceLineNo">173</span> List<HRegionInfo> regionsList = entry.getValue();<a name="line.173"></a> +<span class="sourceLineNo">174</span> if (assignmentMap.get(sn) == null) {<a name="line.174"></a> +<span class="sourceLineNo">175</span> assignmentMap.put(sn, Lists.newArrayList(regionsList));<a name="line.175"></a> +<span class="sourceLineNo">176</span> } else {<a name="line.176"></a> +<span class="sourceLineNo">177</span> assignmentMap.get(sn).addAll(regionsList);<a name="line.177"></a> +<span class="sourceLineNo">178</span> }<a name="line.178"></a> +<span class="sourceLineNo">179</span> }<a name="line.179"></a> +<span class="sourceLineNo">180</span> }<a name="line.180"></a> +<span class="sourceLineNo">181</span><a name="line.181"></a> +<span class="sourceLineNo">182</span> private Map<ServerName, List<HRegionInfo>> generateFNForRegionsWithoutFN(<a name="line.182"></a> +<span class="sourceLineNo">183</span> FavoredNodeAssignmentHelper helper, List<HRegionInfo> regions) throws IOException {<a name="line.183"></a> +<span class="sourceLineNo">184</span><a name="line.184"></a> +<span class="sourceLineNo">185</span> Map<ServerName, List<HRegionInfo>> assignmentMap = Maps.newHashMap();<a name="line.185"></a> +<span class="sourceLineNo">186</span> Map<HRegionInfo, List<ServerName>> regionsNoFNMap;<a name="line.186"></a> +<span class="sourceLineNo">187</span><a name="line.187"></a> +<span class="sourceLineNo">188</span> if (regions.size() > 0) {<a name="line.188"></a> +<span class="sourceLineNo">189</span> regionsNoFNMap = helper.generateFavoredNodesRoundRobin(assignmentMap, regions);<a name="line.189"></a> +<span class="sourceLineNo">190</span> fnm.updateFavoredNodes(regionsNoFNMap);<a name="line.190"></a> +<span class="sourceLineNo">191</span> }<a name="line.191"></a> +<span class="sourceLineNo">192</span> return assignmentMap;<a name="line.192"></a> +<span class="sourceLineNo">193</span> }<a name="line.193"></a> +<span class="sourceLineNo">194</span><a name="line.194"></a> +<span class="sourceLineNo">195</span> /*<a name="line.195"></a> +<span class="sourceLineNo">196</span> * Return a pair - one with assignments when favored nodes are present and another with regions<a name="line.196"></a> +<span class="sourceLineNo">197</span> * without favored nodes.<a name="line.197"></a> +<span class="sourceLineNo">198</span> */<a name="line.198"></a> +<span class="sourceLineNo">199</span> private Pair<Map<ServerName, List<HRegionInfo>>, List<HRegionInfo>><a name="line.199"></a> +<span class="sourceLineNo">200</span> segregateRegionsAndAssignRegionsWithFavoredNodes(Collection<HRegionInfo> regions,<a name="line.200"></a> +<span class="sourceLineNo">201</span> List<ServerName> onlineServers) throws HBaseIOException {<a name="line.201"></a> +<span class="sourceLineNo">202</span><a name="line.202"></a> +<span class="sourceLineNo">203</span> // Since we expect FN to be present most of the time, lets create map with same size<a name="line.203"></a> +<span class="sourceLineNo">204</span> Map<ServerName, List<HRegionInfo>> assignmentMapForFavoredNodes =<a name="line.204"></a> +<span class="sourceLineNo">205</span> new HashMap<>(onlineServers.size());<a name="line.205"></a> +<span class="sourceLineNo">206</span> List<HRegionInfo> regionsWithNoFavoredNodes = new ArrayList<>();<a name="line.206"></a> +<span class="sourceLineNo">207</span><a name="line.207"></a> +<span class="sourceLineNo">208</span> for (HRegionInfo region : regions) {<a name="line.208"></a> +<span class="sourceLineNo">209</span> List<ServerName> favoredNodes = fnm.getFavoredNodes(region);<a name="line.209"></a> +<span class="sourceLineNo">210</span> ServerName primaryHost = null;<a name="line.210"></a> +<span class="sourceLineNo">211</span> ServerName secondaryHost = null;<a name="line.211"></a> +<span class="sourceLineNo">212</span> ServerName tertiaryHost = null;<a name="line.212"></a> +<span class="sourceLineNo">213</span><a name="line.213"></a> +<span class="sourceLineNo">214</span> if (favoredNodes != null && !favoredNodes.isEmpty()) {<a name="line.214"></a> +<span class="sourceLineNo">215</span> for (ServerName s : favoredNodes) {<a name="line.215"></a> +<span class="sourceLineNo">216</span> ServerName serverWithLegitStartCode = getServerFromFavoredNode(onlineServers, s);<a name="line.216"></a> +<span class="sourceLineNo">217</span> if (serverWithLegitStartCode != null) {<a name="line.217"></a> +<span class="sourceLineNo">218</span> FavoredNodesPlan.Position position =<a name="line.218"></a> +<span class="sourceLineNo">219</span> FavoredNodesPlan.getFavoredServerPosition(favoredNodes, s);<a name="line.219"></a> +<span class="sourceLineNo">220</span> if (Position.PRIMARY.equals(position)) {<a name="line.220"></a> +<span class="sourceLineNo">221</span> primaryHost = serverWithLegitStartCode;<a name="line.221"></a> +<span class="sourceLineNo">222</span> } else if (Position.SECONDARY.equals(position)) {<a name="line.222"></a> +<span class="sourceLineNo">223</span> secondaryHost = serverWithLegitStartCode;<a name="line.223"></a> +<span class="sourceLineNo">224</span> } else if (Position.TERTIARY.equals(position)) {<a name="line.224"></a> +<span class="sourceLineNo">225</span> tertiaryHost = serverWithLegitStartCode;<a name="line.225"></a> +<span class="sourceLineNo">226</span> }<a name="line.226"></a> +<span class="sourceLineNo">227</span> }<a name="line.227"></a> +<span class="sourceLineNo">228</span> }<a name="line.228"></a> +<span class="sourceLineNo">229</span> assignRegionToAvailableFavoredNode(assignmentMapForFavoredNodes, region, primaryHost,<a name="line.229"></a> +<span class="sourceLineNo">230</span> secondaryHost, tertiaryHost);<a name="line.230"></a> +<span class="sourceLineNo">231</span> } else {<a name="line.231"></a> +<span class="sourceLineNo">232</span> regionsWithNoFavoredNodes.add(region);<a name="line.232"></a> +<span class="sourceLineNo">233</span> }<a name="line.233"></a> +<span class="sourceLineNo">234</span> }<a name="line.234"></a> +<span class="sourceLineNo">235</span> return new Pair<>(assignmentMapForFavoredNodes, regionsWithNoFavoredNodes);<a name="line.235"></a> +<span class="sourceLineNo">236</span> }<a name="line.236"></a> +<span class="sourceLineNo">237</span><a name="line.237"></a> +<span class="sourceLineNo">238</span> private void addRegionToMap(Map<ServerName, List<HRegionInfo>> assignmentMapForFavoredNodes,<a name="line.238"></a> +<span class="sourceLineNo">239</span> HRegionInfo region, ServerName host) {<a name="line.239"></a> +<span class="sourceLineNo">240</span><a name="line.240"></a> +<span class="sourceLineNo">241</span> List<HRegionInfo> regionsOnServer;<a name="line.241"></a> +<span class="sourceLineNo">242</span> if ((regionsOnServer = assignmentMapForFavoredNodes.get(host)) == null) {<a name="line.242"></a> +<span class="sourceLineNo">243</span> regionsOnServer = Lists.newArrayList();<a name="line.243"></a> +<span class="sourceLineNo">244</span> assignmentMapForFavoredNodes.put(host, regionsOnServer);<a name="line.244"></a> +<span class="sourceLineNo">245</span> }<a name="line.245"></a> +<span class="sourceLineNo">246</span> regionsOnServer.add(region);<a name="line.246"></a> +<span class="sourceLineNo">247</span> }<a name="line.247"></a> +<span class="sourceLineNo">248</span><a name="line.248"></a> +<span class="sourceLineNo">249</span> /*<a name="line.249"></a> +<span class="sourceLineNo">250</span> * Get the ServerName for the FavoredNode. Since FN's startcode is -1, we could want to get the<a name="line.250"></a> +<span class="sourceLineNo">251</span> * ServerName with the correct start code from the list of provided servers.<a name="line.251"></a> +<span class="sourceLineNo">252</span> */<a name="line.252"></a> +<span class="sourceLineNo">253</span> private ServerName getServerFromFavoredNode(List<ServerName> servers, ServerName fn) {<a name="line.253"></a> +<span class="sourceLineNo">254</span> for (ServerName server : servers) {<a name="line.254"></a> +<span class="sourceLineNo">255</span> if (ServerName.isSameHostnameAndPort(fn, server)) {<a name="line.255"></a> +<span class="sourceLineNo">256</span> return server;<a name="line.256"></a> +<span class="sourceLineNo">257</span> }<a name="line.257"></a> +<span class="sourceLineNo">258</span> }<a name="line.258"></a> +<span class="sourceLineNo">259</span> return null;<a name="line.259"></a> +<span class="sourceLineNo">260</span> }<a name="line.260"></a> +<span class="sourceLineNo">261</span><a name="line.261"></a> +<span class="sourceLineNo">262</span> /*<a name="line.262"></a> +<span class="sourceLineNo">263</span> * Assign the region to primary if its available. If both secondary and tertiary are available,<a name="line.263"></a> +<span class="sourceLineNo">264</span> * assign to the host which has less load. Else assign to secondary or tertiary whichever is<a name="line.264"></a> +<span class="sourceLineNo">265</span> * available (in that order).<a name="line.265"></a> +<span class="sourceLineNo">266</span> */<a name="line.266"></a> +<span class="sourceLineNo">267</span> private void assignRegionToAvailableFavoredNode(<a name="line.267"></a> +<span class="sourceLineNo">268</span> Map<ServerName, List<HRegionInfo>> assignmentMapForFavoredNodes, HRegionInfo region,<a name="line.268"></a> +<span class="sourceLineNo">269</span> ServerName primaryHost, ServerName secondaryHost, ServerName tertiaryHost) {<a name="line.269"></a> +<span class="sourceLineNo">270</span><a name="line.270"></a> +<span class="sourceLineNo">271</span> if (primaryHost != null) {<a name="line.271"></a> +<span class="sourceLineNo">272</span> addRegionToMap(assignmentMapForFavoredNodes, region, primaryHost);<a name="line.272"></a> +<span class="sourceLineNo">273</span><a name="line.273"></a> +<span class="sourceLineNo">274</span> } else if (secondaryHost != null && tertiaryHost != null) {<a name="line.274"></a> +<span class="sourceLineNo">275</span><a name="line.275"></a> +<span class="sourceLineNo">276</span> // Assign the region to the one with a lower load (both have the desired hdfs blocks)<a name="line.276"></a> +<span class="sourceLineNo">277</span> ServerName s;<a name="line.277"></a> +<span class="sourceLineNo">278</span> ServerLoad tertiaryLoad = super.services.getServerManager().getLoad(tertiaryHost);<a name="line.278"></a> +<span class="sourceLineNo">279</span> ServerLoad secondaryLoad = super.services.getServerManager().getLoad(secondaryHost);<a name="line.279"></a> +<span class="sourceLineNo">280</span> if (secondaryLoad != null && tertiaryLoad != null) {<a name="line.280"></a> +<span class="sourceLineNo">281</span> if (secondaryLoad.getLoad() < tertiaryLoad.getLoad()) {<a name="line.281"></a> +<span class="sourceLineNo">282</span> s = secondaryHost;<a name="line.282"></a> +<span class="sourceLineNo">283</span> } else {<a name="line.283"></a> +<span class="sourceLineNo">284</span> s = tertiaryHost;<a name="line.284"></a> +<span class="sourceLineNo">285</span> }<a name="line.285"></a> +<span class="sourceLineNo">286</span> } else {<a name="line.286"></a> +<span class="sourceLineNo">287</span> // We don't have one/more load, lets just choose a random node<a name="line.287"></a> +<span class="sourceLineNo">288</span> s = RANDOM.nextBoolean() ? secondaryHost : tertiaryHost;<a name="line.288"></a> +<span class="sourceLineNo">289</span> }<a name="line.289"></a> +<span class="sourceLineNo">290</span> addRegionToMap(assignmentMapForFavoredNodes, region, s);<a name="line.290"></a> +<span class="sourceLineNo">291</span> } else if (secondaryHost != null) {<a name="line.291"></a> +<span class="sourceLineNo">292</span> addRegionToMap(assignmentMapForFavoredNodes, region, secondaryHost);<a name="line.292"></a> +<span class="sourceLineNo">293</span> } else if (tertiaryHost != null) {<a name="line.293"></a> +<span class="sourceLineNo">294</span> addRegionToMap(assignmentMapForFavoredNodes, region, tertiaryHost);<a name="line.294"></a> +<span class="sourceLineNo">295</span> } else {<a name="line.295"></a> +<span class="sourceLineNo">296</span> // No favored nodes are online, lets assign to BOGUS server<a name="line.296"></a> +<span class="sourceLineNo">297</span> addRegionToMap(assignmentMapForFavoredNodes, region, BOGUS_SERVER_NAME);<a name="line.297"></a> +<span class="sourceLineNo">298</span> }<a name="line.298"></a> +<span class="sourceLineNo">299</span> }<a name="line.299"></a> +<span class="sourceLineNo">300</span><a name="line.300"></a> +<span class="sourceLineNo">301</span> /*<a name="line.301"></a> +<span class="sourceLineNo">302</span> * If we have favored nodes for a region, we will return one of the FN as destination. If<a name="line.302"></a> +<span class="sourceLineNo">303</span> * favored nodes are not present for a region, we will generate and return one of the FN as<a name="line.303"></a> +<span class="sourceLineNo">304</span> * destination. If we can't generate anything, lets fallback.<a name="line.304"></a> +<span class="sourceLineNo">305</span> */<a name="line.305"></a> +<span class="sourceLineNo">306</span> @Override<a name="line.306"></a> +<span class="sourceLineNo">307</span> public ServerName randomAssignment(HRegionInfo regionInfo, List<ServerName> servers)<a name="line.307"></a> +<span class="sourceLineNo">308</span> throws HBaseIOException {<a name="line.308"></a> +<span class="sourceLineNo">309</span><a name="line.309"></a> +<span class="sourceLineNo">310</span> if (servers != null && servers.contains(masterServerName)) {<a name="line.310"></a> +<span class="sourceLineNo">311</span> if (shouldBeOnMaster(regionInfo)) {<a name="line.311"></a> +<span class="sourceLineNo">312</span> metricsBalancer.incrMiscInvocations();<a name="line.312"></a> +<span class="sourceLineNo">313</span> return masterServerName;<a name="line.313"></a> +<span class="sourceLineNo">314</span> }<a name="line.314"></a> +<span class="sourceLineNo">315</span> if (!LoadBalancer.isTablesOnMaster(getConf())) {<a name="line.315"></a> +<span class="sourceLineNo">316</span> // Guarantee we do not put any regions on master<a name="line.316"></a> +<span class="sourceLineNo">317</span> servers = new ArrayList<>(servers);<a name="line.317"></a> +<span class="sourceLineNo">318</span> servers.remove(masterServerName);<a name="line.318"></a> +<span class="sourceLineNo">319</span> }<a name="line.319"></a> +<span class="sourceLineNo">320</span> }<a name="line.320"></a> +<span class="sourceLineNo">321</span><a name="line.321"></a> +<span class="sourceLineNo">322</span> ServerName destination = null;<a name="line.322"></a> +<span class="sourceLineNo">323</span> if (!FavoredNodesManager.isFavoredNodeApplicable(regionInfo)) {<a name="line.323"></a> +<span class="sourceLineNo">324</span> return super.randomAssignment(regionInfo, servers);<a name="line.324"></a> +<span class="sourceLineNo">325</span> }<a name="line.325"></a> +<span class="sourceLineNo">326</span><a name="line.326"></a> +<span class="sourceLineNo">327</span> metricsBalancer.incrMiscInvocations();<a name="line.327"></a> +<span class="sourceLineNo">328</span><a name="line.328"></a> +<span class="sourceLineNo">329</span> List<ServerName> favoredNodes = fnm.getFavoredNodes(regionInfo);<a name="line.329"></a> +<span class="sourceLineNo">330</span> if (favoredNodes == null || favoredNodes.isEmpty()) {<a name="line.330"></a> +<span class="sourceLineNo">331</span> // Generate new favored nodes and return primary<a name="line.331"></a> +<span class="sourceLineNo">332</span> FavoredNodeAssignmentHelper helper = new FavoredNodeAssignmentHelper(servers, getConf());<a name="line.332"></a> +<span class="sourceLineNo">333</span> helper.initialize();<a name="line.333"></a> +<span class="sourceLineNo">334</span> try {<a name="line.334"></a> +<span class="sourceLineNo">335</span> favoredNodes = helper.generateFavoredNodes(regionInfo);<a name="line.335"></a> +<span class="sourceLineNo">336</span> updateFavoredNodesForRegion(regionInfo, favoredNodes);<a name="line.336"></a> +<span class="sourceLineNo">337</span><a name="line.337"></a> +<span class="sourceLineNo">338</span> } catch (IOException e) {<a name="line.338"></a> +<span class="sourceLineNo">339</span> LOG.warn("Encountered exception while doing favored-nodes (random)assignment " + e);<a name="line.339"></a> +<span class="sourceLineNo">340</span> throw new HBaseIOException(e);<a name="line.340"></a> +<span class="sourceLineNo">341</span> }<a name="line.341"></a> +<span class="sourceLineNo">342</span> }<a name="line.342"></a> +<span class="sourceLineNo">343</span><a name="line.343"></a> +<span class="sourceLineNo">344</span> List<ServerName> onlineServers = getOnlineFavoredNodes(servers, favoredNodes);<a name="line.344"></a> +<span class="sourceLineNo">345</span> if (onlineServers.size() > 0) {<a name="line.345"></a> +<span class="sourceLineNo">346</span> destination = onlineServers.get(RANDOM.nextInt(onlineServers.size()));<a name="line.346"></a> +<span class="sourceLineNo">347</span> }<a name="line.347"></a> +<span class="sourceLineNo">348</span><a name="line.348"></a> +<span class="sourceLineNo">349</span> boolean alwaysAssign = getConf().getBoolean(FAVORED_ALWAYS_ASSIGN_REGIONS, true);<a name="line.349"></a> +<span class="sourceLineNo">350</span> if (destination == null && alwaysAssign) {<a name="line.350"></a> +<span class="sourceLineNo">351</span> LOG.warn("Can't generate FN for region: " + regionInfo + " falling back");<a name="line.351"></a> +<span class="sourceLineNo">352</span> destination = super.randomAssignment(regionInfo, servers);<a name="line.352"></a> +<span class="sourceLineNo">353</span> }<a name="line.353"></a> +<span class="sourceLineNo">354</span> return destination;<a name="line.354"></a> +<span class="sourceLineNo">355</span> }<a name="line.355"></a> +<span class="sourceLineNo">356</span><a name="line.356"></a> +<span class="sourceLineNo">357</span> private void updateFavoredNodesForRegion(HRegionInfo regionInfo, List<ServerName> newFavoredNodes)<a name="line.357"></a> +<span class="sourceLineNo">358</span> throws IOException {<a name="line.358"></a> +<span class="sourceLineNo">359</span> Map<HRegionInfo, List<ServerName>> regionFNMap = Maps.newHashMap();<a name="line.359"></a> +<span class="sourceLineNo">360</span> regionFNMap.put(regionInfo, newFavoredNodes);<a name="line.360"></a> +<span class="sourceLineNo">361</span> fnm.updateFavoredNodes(regionFNMap);<a name="line.361"></a> +<span class="sourceLineNo">362</span> }<a name="line.362"></a> +<span class="sourceLineNo">363</span><a name="line.363"></a> +<span class="sourceLineNo">364</span> /*<a name="line.364"></a> +<span class="sourceLineNo">365</span> * Reuse BaseLoadBalancer's retainAssignment, but generate favored nodes when its missing.<a name="line.365"></a> +<span class="sourceLineNo">366</span> */<a name="line.366"></a> +<span class="sourceLineNo">367</span> @Override<a name="line.367"></a> +<span class="sourceLineNo">368</span> public Map<ServerName, List<HRegionInfo>> retainAssignment(Map<HRegionInfo, ServerName> regions,<a name="line.368"></a> +<span class="sourceLineNo">369</span> List<ServerName> servers) throws HBaseIOException {<a name="line.369"></a> +<span class="sourceLineNo">370</span><a name="line.370"></a> +<span class="sourceLineNo">371</span> Map<ServerName, List<HRegionInfo>> assignmentMap = Maps.newHashMap();<a name="line.371"></a> +<span class="sourceLineNo">372</span> Map<ServerName, List<HRegionInfo>> result = super.retainAssignment(regions, servers);<a name="line.372"></a> +<span class="sourceLineNo">373</span> if (result == null || result.isEmpty()) {<a name="line.373"></a> +<span class="sourceLineNo">374</span> LOG.warn("Nothing to assign to, probably no servers or no regions");<a name="line.374"></a> +<span class="sourceLineNo">375</span> return null;<a name="line.375"></a> +<span class="sourceLineNo">376</span> }<a name="line.376"></a> +<span class="sourceLineNo">377</span><a name="line.377"></a> +<span class="sourceLineNo">378</span> // Guarantee not to put other regions on master<a name="line.378"></a> +<span class="sourceLineNo">379</span> if (servers != null && servers.contains(masterServerName)) {<a name="line.379"></a> +<span class="sourceLineNo">380</span> servers = new ArrayList<>(servers);<a name="line.380"></a> +<span class="sourceLineNo">381</span> servers.remove(masterServerName);<a name="line.381"></a> +<span class="sourceLineNo">382</span> }<a name="line.382"></a> +<span class="sourceLineNo">383</span><a name="line.383"></a> +<span class="sourceLineNo">384</span> // Lets check if favored nodes info is in META, if not generate now.<a name="line.384"></a> +<span class="sourceLineNo">385</span> FavoredNodeAssignmentHelper helper = new FavoredNodeAssignmentHelper(servers, getConf());<a name="line.385"></a> +<span class="sourceLineNo">386</span> helper.initialize();<a name="line.386"></a> <span class="sourceLineNo">387</span><a name="line.387"></a> -<span class="sourceLineNo">388</span> try {<a name="line.388"></a> -<span class="sourceLineNo">389</span> for (Entry<ServerName, List<HRegionInfo>> entry : result.entrySet()) {<a name="line.389"></a> +<span class="sourceLineNo">388</span> LOG.debug("Generating favored nodes for regions missing them.");<a name="line.388"></a> +<span class="sourceLineNo">389</span> Map<HRegionInfo, List<ServerName>> regionFNMap = Maps.newHashMap();<a name="line.389"></a> <span class="sourceLineNo">390</span><a name="line.390"></a> -<span class="sourceLineNo">391</span> ServerName sn = entry.getKey();<a name="line.391"></a> -<span class="sourceLineNo">392</span> ServerName primary = ServerName.valueOf(sn.getHostname(), sn.getPort(), NON_STARTCODE);<a name="line.392"></a> +<span class="sourceLineNo">391</span> try {<a name="line.391"></a> +<span class="sourceLineNo">392</span> for (Entry<ServerName, List<HRegionInfo>> entry : result.entrySet()) {<a name="line.392"></a> <span class="sourceLineNo">393</span><a name="line.393"></a> -<span class="sourceLineNo">394</span> for (HRegionInfo hri : entry.getValue()) {<a name="line.394"></a> -<span class="sourceLineNo">395</span><a name="line.395"></a> -<span class="sourceLineNo">396</span> if (FavoredNodesManager.isFavoredNodeApplicable(hri)) {<a name="line.396"></a> -<span class="sourceLineNo">397</span> List<ServerName> favoredNodes = fnm.getFavoredNodes(hri);<a name="line.397"></a> -<span class="sourceLineNo">398</span> if (favoredNodes == null || favoredNodes.size() < FAVORED_NODES_NUM) {<a name="line.398"></a> -<span class="sourceLineNo">399</span><a name="line.399"></a> -<span class="sourceLineNo">400</span> LOG.debug("Generating favored nodes for: " + hri + " with primary: " + primary);<a name="line.400"></a> -<span class="sourceLineNo">401</span> ServerName[] secondaryAndTertiaryNodes = helper.getSecondaryAndTertiary(hri, primary);<a name="line.401"></a> -<span class="sourceLineNo">402</span> if (secondaryAndTertiaryNodes != null && secondaryAndTertiaryNodes.length == 2) {<a name="line.402"></a> -<span class="sourceLineNo">403</span> List<ServerName> newFavoredNodes = Lists.newArrayList();<a name="line.403"></a> -<span class="sourceLineNo">404</span> newFavoredNodes.add(primary);<a name="line.404"></a> -<span class="sourceLineNo">405</span> newFavoredNodes.add(ServerName.valueOf(secondaryAndTertiaryNodes[0].getHostname(),<a name="line.405"></a> -<span class="sourceLineNo">406</span> secondaryAndTertiaryNodes[0].getPort(), NON_STARTCODE));<a name="line.406"></a> -<span class="sourceLineNo">407</span> newFavoredNodes.add(ServerName.valueOf(secondaryAndTertiaryNodes[1].getHostname(),<a name="line.407"></a> -<span class="sourceLineNo">408</span> secondaryAndTertiaryNodes[1].getPort(), NON_STARTCODE));<a name="line.408"></a> -<span class="sourceLineNo">409</span> regionFNMap.put(hri, newFavoredNodes);<a name="line.409"></a> -<span class="sourceLineNo">410</span> addRegionToMap(assignmentMap, hri, sn);<a name="line.410"></a> -<span class="sourceLineNo">411</span><a name="line.411"></a> -<span class="sourceLineNo">412</span> } else {<a name="line.412"></a> -<span class="sourceLineNo">413</span> throw new HBaseIOException("Cannot generate secondary/tertiary FN for " + hri<a name="line.413"></a> -<span class="sourceLineNo">414</span> + " generated "<a name="line.414"></a> -<span class="sourceLineNo">415</span> + (secondaryAndTertiaryNodes != null ? secondaryAndTertiaryNodes : " nothing"));<a name="line.415"></a> -<span class="sourceLineNo">416</span> }<a name="line.416"></a> -<span class="sourceLineNo">417</span> } else {<a name="line.417"></a> -<span class="sourceLineNo">418</span> List<ServerName> onlineFN = getOnlineFavoredNodes(servers, favoredNodes);<a name="line.418"></a> -<span class="sourceLineNo">419</span> if (onlineFN.isEmpty()) {<a name="line.419"></a> -<span class="sourceLineNo">420</span> // All favored nodes are dead, lets assign it to BOGUS<a name="line.420"></a> -<span class="sourceLineNo">421</span> addRegionToMap(assignmentMap, hri, BOGUS_SERVER_NAME);<a name="line.421"></a> -<span class="sourceLineNo">422</span> } else {<a name="line.422"></a> -<span class="sourceLineNo">423</span> // Is primary not on FN? Less likely, but we can still take care of this.<a name="line.423"></a> -<span class="sourceLineNo">424</span> if (FavoredNodesPlan.getFavoredServerPosition(favoredNodes, sn) != null) {<a name="line.424"></a> -<span class="sourceLineNo">425</span> addRegionToMap(assignmentMap, hri, sn);<a name="line.425"></a> -<span class="sourceLineNo">426</span> } else {<a name="line.426"></a> -<span class="sourceLineNo">427</span> ServerName destination = onlineFN.get(RANDOM.nextInt(onlineFN.size()));<a name="line.427"></a> -<span class="sourceLineNo">428</span> LOG.warn("Region: " + hri + " not hosted on favored nodes: " + favoredNodes<a name="line.428"></a> -<span class="sourceLineNo">429</span> + " current: " + sn + " moving to: " + destination);<a name="line.429"></a> -<span class="sourceLineNo">430</span> addRegionToMap(assignmentMap, hri, destination);<a name="line.430"></a> -<span class="sourceLineNo">431</span> }<a name="line.431"></a> -<span class="sourceLineNo">432</span> }<a name="line.432"></a> -<span class="sourceLineNo">433</span> }<a name="line.433"></a> -<span class="sourceLineNo">434</span> } else {<a name="line.434"></a> -<span class="sourceLineNo">435</span> addRegionToMap(assignmentMap, hri, sn);<a name="line.435"></a> -<span class="sourceLineNo">436</span> }<a name="line.436"></a> -<span class="sourceLineNo">437</span> }<a name="line.437"></a> -<span class="sourceLineNo">438</span> }<a name="line.438"></a> -<span class="sourceLineNo">439</span><a name="line.439"></a> -<span class="sourceLineNo">440</span> if (!regionFNMap.isEmpty()) {<a name="line.440"></a> -<span class="sourceLineNo">441</span> LOG.debug("Updating FN in meta for missing regions, count: " + regionFNMap.size());<a name="line.441"></a> -<span class="sourceLineNo">442</span> fnm.updateFavoredNodes(regionFNMap);<a name="line.442"></a> -<span class="sourceLineNo">443</span> }<a name="line.443"></a> -<span class="sourceLineNo">444</span><a name="line.444"></a> -<span class="sourceLineNo">445</span> } catch (IOException e) {<a name="line.445"></a> -<span class="sourceLineNo">446</span> throw new HBaseIOException("Cannot generate/update FN for regions: " + regionFNMap.keySet());<a name="line.446"></a> -<span class="sourceLineNo">447</span> }<a name="line.447"></a> -<span class="sourceLineNo">448</span><a name="line.448"></a> -<span class="sourceLineNo">449</span> return assignmentMap;<a name="line.449"></a> -<span class="sourceLineNo">450</span> }<a name="line.450"></a> +<span class="sourceLineNo">394</span> ServerName sn = entry.getKey();<a name="line.394"></a> +<span class="sourceLineNo">395</span> ServerName primary = ServerName.valueOf(sn.getHostname(), sn.getPort(), NON_STARTCODE);<a name="line.395"></a> +<span class="sourceLineNo">396</span><a name="line.396"></a> +<span class="sourceLineNo">397</span> for (HRegionInfo hri : entry.getValue()) {<a name="line.397"></a> +<span class="sourceLineNo">398</span><a name="line.398"></a> +<span class="sourceLineNo">399</span> if (FavoredNodesManager.isFavoredNodeApplicable(hri)) {<a name="line.399"></a> +<span class="sourceLineNo">400</span> List<ServerName> favoredNodes = fnm.getFavoredNodes(hri);<a name="line.400"></a> +<span class="sourceLineNo">401</span> if (favoredNodes == null || favoredNodes.size() < FAVORED_NODES_NUM) {<a name="line.401"></a> +<span class="sourceLineNo">402</span><a name="line.402"></a> +<span class="sourceLineNo">403</span> LOG.debug("Generating favored nodes for: " + hri + " with primary: " + primary);<a name="line.403"></a> +<span class="sourceLineNo">404</span> ServerName[] secondaryAndTertiaryNodes = helper.getSecondaryAndTertiary(hri, primary);<a name="line.404"></a> +<span class="sourceLineNo">405</span> if (secondaryAndTertiaryNodes != null && secondaryAndTertiaryNodes.length == 2) {<a name="line.405"></a> +<span class="sourceLineNo">406</span> List<ServerName> newFavoredNodes = Lists.newArrayList();<a name="line.406"></a> +<span class="sourceLineNo">407</span> newFavoredNodes.add(primary);<a name="line.407"></a> +<span class="sourceLineNo">408</span> newFavoredNodes.add(ServerName.valueOf(secondaryAndTertiaryNodes[0].getHostname(),<a name="line.408"></a> +<span class="sourceLineNo">409</span> secondaryAndTertiaryNodes[0].getPort(), NON_STARTCODE));<a name="line.409"></a> +<span class="sourceLineNo">410</span> newFavoredNodes.add(ServerName.valueOf(secondaryAndTertiaryNodes[1].getHostname(),<a name="line.410"></a> +<span class="sourceLineNo">411</span> secondaryAndTertiaryNodes[1].getPort(), NON_STARTCODE));<a name="line.411"></a> +<span class="sourceLineNo">412</span> regionFNMap.put(hri, newFavoredNodes);<a name="line.412"></a> +<span class="sourceLineNo">413</span> addRegionToMap(assignmentMap, hri, sn);<a name="line.413"></a> +<span class="sourceLineNo">414</span><a name="line.414"></a> +<span class="sourceLineNo">415</span> } else {<a name="line.415"></a> +<span class="sourceLineNo">416</span> throw new 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class="sourceLineNo">426</span> // Is primary not on FN? Less likely, but we can still take care of this.<a name="line.426"></a> +<span class="sourceLineNo">427</span> if (FavoredNodesPlan.getFavoredServerPosition(favoredNodes, sn) != null) {<a name="line.427"></a> +<span class="sourceLineNo">428</span> addRegionToMap(assignmentMap, hri, sn);<a name="line.428"></a> +<span class="sourceLineNo">429</span> } else {<a name="line.429"></a> +<span class="sourceLineNo">430</span> ServerName destination = onlineFN.get(RANDOM.nextInt(onlineFN.size()));<a name="line.430"></a> +<span class="sourceLineNo">431</span> LOG.warn("Region: " + hri + " not hosted on favored nodes: " + favoredNodes<a name="line.431"></a> +<span class="sourceLineNo">432</span> + " current: " + sn + " moving to: " + destination);<a name="line.432"></a> +<span class="sourceLineNo">433</span> addRegionToMap(assignmentMap, hri, destination);<a name="line.433"></a> +<span class="sourceLineNo">434</span> }<a name="line.434"></a> +<span class="sourceLineNo">435</span> }<a name="line.435"></a> +<span class="sourceLineNo">436</span> }<a name="line.436"></a> +<span class="sourceLineNo">437</span> } else {<a name="line.437"></a> +<span class="sourceLineNo">438</span> addRegionToMap(assignmentMap, hri, sn);<a name="line.438"></a> +<span class="sourceLineNo">439</span> }<a name="line.439"></a> +<span class="sourceLineNo">440</span> }<a name="line.440"></a> +<span class="sourceLineNo">441</span> }<a name="line.441"></a> +<span class="sourceLineNo">442</span><a name="line.442"></a> +<span class="sourceLineNo">443</span> if (!regionFNMap.isEmpty()) {<a name="line.443"></a> +<span class="sourceLineNo">444</span> LOG.debug("Updating FN in meta for missing regions, count: " + regionFNMap.size());<a name="line.444"></a> +<span class="sourceLineNo">445</span> fnm.updateFavoredNodes(regionFNMap);<a name="line.445"></a> +<span class="sourceLineNo">446</span> }<a name="line.446"></a> +<span class="sourceLineNo">447</span><a name="line.447"></a> +<span class="sourceLineNo">448</span> } catch (IOException e) {<a name="line.448"></a> +<span class="sourceLineNo">449</span> throw new HBaseIOException("Cannot generate/update FN for regions: " + regionFNMap.keySet());<a name="line.449"></a> +<span class="sourceLineNo">450</span> }<a name="line.450"></a> <span class="sourceLineNo">451</span><a name="line.451"></a> -<span class="sourceLineNo">452</span> /*<a name="line.452"></a> -<span class="sourceLineNo">453</span> * Return list of favored nodes that are online.<a name="line.453"></a> -<span class="sourceLineNo">454</span> */<a name="line.454"></a> -<span class="sourceLineNo">455</span> private List<ServerName> getOnlineFavoredNodes(List<ServerName> onlineServers,<a name="line.455"></a> -<span class="sourceLineNo">456</span> List<ServerName> serversWithoutStartCodes) {<a name="line.456"></a> -<span class="sourceLineNo">457</span> if (serversWithoutStartCodes == null) {<a name="line.457"></a> -<span class="sourceLineNo">458</span> return null;<a name="line.458"></a> -<span class="sourceLineNo">459</span> } else {<a name="line.459"></a> -<span class="sourceLineNo">460</span> List<ServerName> result = Lists.newArrayList();<a name="line.460"></a> -<span class="sourceLineNo">461</span> for (ServerName sn : serversWithoutStartCodes) {<a name="line.461"></a> -<span class="sourceLineNo">462</span> for (ServerName online : onlineServers) {<a name="line.462"></a> -<span class="sourceLineNo">463</span> if (ServerName.isSameHostnameAndPort(sn, online)) {<a name="line.463"></a> -<span class="sourceLineNo">464</span> result.add(online);<a name="line.464"></a> -<span class="sourceLineNo">465</span> }<a name="line.465"></a> -<span class="sourceLineNo">466</span> }<a name="line.466"></a> -<span class="sourceLineNo">467</span> }<a name="line.467"></a> -<span class="sourceLineNo">468</span> return result;<a name="line.468"></a> -<span class="sourceLineNo">469</span> }<a name="line.469"></a> -<span class="sourceLineNo">470</span> }<a name="line.470"></a> -<span class="sourceLineNo">471</span><a name="line.471"></a> -<span class="sourceLineNo">472</span> public synchronized List<ServerName> getFavoredNodes(HRegionInfo regionInfo) {<a name="line.472"></a> -<span class="sourceLineNo">473</span> return this.fnm.getFavoredNodes(regionInfo);<a name="line.473"></a> -<span class="sourceLineNo">474</span> }<a name="line.474"></a> -<span class="sourceLineNo">475</span><a name="line.475"></a> -<span class="sourceLineNo">476</span> /*<a name="line.476"></a> -<span class="sourceLineNo">477</span> * Generate Favored Nodes for daughters during region split.<a name="line.477"></a> -<span class="sourceLineNo">478</span> *<a name="line.478"></a> -<span class="sourceLineNo">479</span> * If the parent does not have FN, regenerates them for the daughters.<a name="line.479"></a> -<span class="sourceLineNo">480</span> *<a name="line.480"></a> -<span class="sourceLineNo">481</span> * If the parent has FN, inherit two FN from parent for each daughter and generate the remaining.<a name="line.481"></a> -<span class="sourceLineNo">482</span> * The primary FN for both the daughters should be the same as parent. 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<TRUNCATED>
