http://git-wip-us.apache.org/repos/asf/hbase-site/blob/1576543b/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.WALEntryStreamRuntimeException.html
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diff --git
a/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.WALEntryStreamRuntimeException.html
b/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.WALEntryStreamRuntimeException.html
index 03b72df..745d53a 100644
---
a/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.WALEntryStreamRuntimeException.html
+++
b/devapidocs/src-html/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.WALEntryStreamRuntimeException.html
@@ -49,374 +49,382 @@
<span class="sourceLineNo">041</span>import
org.apache.hadoop.hbase.wal.WAL.Entry;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import
org.apache.hadoop.hbase.wal.WAL.Reader;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import
org.apache.hadoop.hbase.wal.WALFactory;<a name="line.43"></a>
-<span class="sourceLineNo">044</span><a name="line.44"></a>
-<span class="sourceLineNo">045</span>/**<a name="line.45"></a>
-<span class="sourceLineNo">046</span> * Streaming access to WAL entries. This
class is given a queue of WAL {@link Path}, and continually<a
name="line.46"></a>
-<span class="sourceLineNo">047</span> * iterates through all the WAL {@link
Entry} in the queue. When it's done reading from a Path, it<a
name="line.47"></a>
-<span class="sourceLineNo">048</span> * dequeues it and starts reading from
the next.<a name="line.48"></a>
-<span class="sourceLineNo">049</span> */<a name="line.49"></a>
-<span class="sourceLineNo">050</span>@InterfaceAudience.Private<a
name="line.50"></a>
-<span class="sourceLineNo">051</span>@InterfaceStability.Evolving<a
name="line.51"></a>
-<span class="sourceLineNo">052</span>public class WALEntryStream implements
Iterator<Entry>, Closeable, Iterable<Entry> {<a name="line.52"></a>
-<span class="sourceLineNo">053</span> private static final Log LOG =
LogFactory.getLog(WALEntryStream.class);<a name="line.53"></a>
-<span class="sourceLineNo">054</span><a name="line.54"></a>
-<span class="sourceLineNo">055</span> private Reader reader;<a
name="line.55"></a>
-<span class="sourceLineNo">056</span> private Path currentPath;<a
name="line.56"></a>
-<span class="sourceLineNo">057</span> // cache of next entry for hasNext()<a
name="line.57"></a>
-<span class="sourceLineNo">058</span> private Entry currentEntry;<a
name="line.58"></a>
-<span class="sourceLineNo">059</span> // position after reading current
entry<a name="line.59"></a>
-<span class="sourceLineNo">060</span> private long currentPosition = 0;<a
name="line.60"></a>
-<span class="sourceLineNo">061</span> private
PriorityBlockingQueue<Path> logQueue;<a name="line.61"></a>
-<span class="sourceLineNo">062</span> private FileSystem fs;<a
name="line.62"></a>
-<span class="sourceLineNo">063</span> private Configuration conf;<a
name="line.63"></a>
-<span class="sourceLineNo">064</span> private MetricsSource metrics;<a
name="line.64"></a>
-<span class="sourceLineNo">065</span><a name="line.65"></a>
-<span class="sourceLineNo">066</span> /**<a name="line.66"></a>
-<span class="sourceLineNo">067</span> * Create an entry stream over the
given queue<a name="line.67"></a>
-<span class="sourceLineNo">068</span> * @param logQueue the queue of WAL
paths<a name="line.68"></a>
-<span class="sourceLineNo">069</span> * @param fs {@link FileSystem} to use
to create {@link Reader} for this stream<a name="line.69"></a>
-<span class="sourceLineNo">070</span> * @param conf {@link Configuration} to
use to create {@link Reader} for this stream<a name="line.70"></a>
-<span class="sourceLineNo">071</span> * @param metrics replication metrics<a
name="line.71"></a>
-<span class="sourceLineNo">072</span> * @throws IOException<a
name="line.72"></a>
-<span class="sourceLineNo">073</span> */<a name="line.73"></a>
-<span class="sourceLineNo">074</span> public
WALEntryStream(PriorityBlockingQueue<Path> logQueue, FileSystem fs,
Configuration conf,<a name="line.74"></a>
-<span class="sourceLineNo">075</span> MetricsSource metrics)<a
name="line.75"></a>
-<span class="sourceLineNo">076</span> throws IOException {<a
name="line.76"></a>
-<span class="sourceLineNo">077</span> this(logQueue, fs, conf, 0,
metrics);<a name="line.77"></a>
-<span class="sourceLineNo">078</span> }<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> * Create an entry stream over the
given queue at the given start position<a name="line.81"></a>
-<span class="sourceLineNo">082</span> * @param logQueue the queue of WAL
paths<a name="line.82"></a>
-<span class="sourceLineNo">083</span> * @param fs {@link FileSystem} to use
to create {@link Reader} for this stream<a name="line.83"></a>
-<span class="sourceLineNo">084</span> * @param conf {@link Configuration} to
use to create {@link Reader} for this stream<a name="line.84"></a>
-<span class="sourceLineNo">085</span> * @param startPosition the position in
the first WAL to start reading at<a name="line.85"></a>
-<span class="sourceLineNo">086</span> * @param metrics replication metrics<a
name="line.86"></a>
-<span class="sourceLineNo">087</span> * @throws IOException<a
name="line.87"></a>
-<span class="sourceLineNo">088</span> */<a name="line.88"></a>
-<span class="sourceLineNo">089</span> public
WALEntryStream(PriorityBlockingQueue<Path> logQueue, FileSystem fs,
Configuration conf,<a name="line.89"></a>
-<span class="sourceLineNo">090</span> long startPosition, MetricsSource
metrics) throws IOException {<a name="line.90"></a>
-<span class="sourceLineNo">091</span> this.logQueue = logQueue;<a
name="line.91"></a>
-<span class="sourceLineNo">092</span> this.fs = fs;<a name="line.92"></a>
-<span class="sourceLineNo">093</span> this.conf = conf;<a
name="line.93"></a>
-<span class="sourceLineNo">094</span> this.currentPosition =
startPosition;<a name="line.94"></a>
-<span class="sourceLineNo">095</span> this.metrics = metrics;<a
name="line.95"></a>
-<span class="sourceLineNo">096</span> }<a name="line.96"></a>
-<span class="sourceLineNo">097</span><a name="line.97"></a>
-<span class="sourceLineNo">098</span> /**<a name="line.98"></a>
-<span class="sourceLineNo">099</span> * @return true if there is another WAL
{@link Entry}<a name="line.99"></a>
-<span class="sourceLineNo">100</span> * @throws
WALEntryStreamRuntimeException if there was an Exception while reading<a
name="line.100"></a>
-<span class="sourceLineNo">101</span> */<a name="line.101"></a>
-<span class="sourceLineNo">102</span> @Override<a name="line.102"></a>
-<span class="sourceLineNo">103</span> public boolean hasNext() {<a
name="line.103"></a>
-<span class="sourceLineNo">104</span> if (currentEntry == null) {<a
name="line.104"></a>
-<span class="sourceLineNo">105</span> try {<a name="line.105"></a>
-<span class="sourceLineNo">106</span> tryAdvanceEntry();<a
name="line.106"></a>
-<span class="sourceLineNo">107</span> } catch (Exception e) {<a
name="line.107"></a>
-<span class="sourceLineNo">108</span> throw new
WALEntryStreamRuntimeException(e);<a name="line.108"></a>
-<span class="sourceLineNo">109</span> }<a name="line.109"></a>
-<span class="sourceLineNo">110</span> }<a name="line.110"></a>
-<span class="sourceLineNo">111</span> return currentEntry != null;<a
name="line.111"></a>
-<span class="sourceLineNo">112</span> }<a name="line.112"></a>
-<span class="sourceLineNo">113</span><a name="line.113"></a>
-<span class="sourceLineNo">114</span> /**<a name="line.114"></a>
-<span class="sourceLineNo">115</span> * @return the next WAL entry in this
stream<a name="line.115"></a>
-<span class="sourceLineNo">116</span> * @throws
WALEntryStreamRuntimeException if there was an IOException<a
name="line.116"></a>
-<span class="sourceLineNo">117</span> * @throws NoSuchElementException if no
more entries in the stream.<a name="line.117"></a>
-<span class="sourceLineNo">118</span> */<a name="line.118"></a>
-<span class="sourceLineNo">119</span> @Override<a name="line.119"></a>
-<span class="sourceLineNo">120</span> public Entry next() {<a
name="line.120"></a>
-<span class="sourceLineNo">121</span> if (!hasNext()) throw new
NoSuchElementException();<a name="line.121"></a>
-<span class="sourceLineNo">122</span> Entry save = currentEntry;<a
name="line.122"></a>
-<span class="sourceLineNo">123</span> currentEntry = null; // gets reloaded
by hasNext()<a name="line.123"></a>
-<span class="sourceLineNo">124</span> return save;<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> * Not supported.<a name="line.128"></a>
-<span class="sourceLineNo">129</span> */<a name="line.129"></a>
-<span class="sourceLineNo">130</span> @Override<a name="line.130"></a>
-<span class="sourceLineNo">131</span> public void remove() {<a
name="line.131"></a>
-<span class="sourceLineNo">132</span> throw new
UnsupportedOperationException();<a name="line.132"></a>
-<span class="sourceLineNo">133</span> }<a name="line.133"></a>
-<span class="sourceLineNo">134</span><a name="line.134"></a>
-<span class="sourceLineNo">135</span> /**<a name="line.135"></a>
-<span class="sourceLineNo">136</span> * {@inheritDoc}<a name="line.136"></a>
-<span class="sourceLineNo">137</span> */<a name="line.137"></a>
-<span class="sourceLineNo">138</span> @Override<a name="line.138"></a>
-<span class="sourceLineNo">139</span> public void close() throws IOException
{<a name="line.139"></a>
-<span class="sourceLineNo">140</span> closeReader();<a name="line.140"></a>
-<span class="sourceLineNo">141</span> }<a name="line.141"></a>
-<span class="sourceLineNo">142</span><a name="line.142"></a>
-<span class="sourceLineNo">143</span> /**<a name="line.143"></a>
-<span class="sourceLineNo">144</span> * @return the iterator over WAL
entries in the queue.<a name="line.144"></a>
-<span class="sourceLineNo">145</span> */<a name="line.145"></a>
-<span class="sourceLineNo">146</span> @Override<a name="line.146"></a>
-<span class="sourceLineNo">147</span> public Iterator<Entry> iterator()
{<a name="line.147"></a>
-<span class="sourceLineNo">148</span> return this;<a name="line.148"></a>
-<span class="sourceLineNo">149</span> }<a name="line.149"></a>
-<span class="sourceLineNo">150</span><a name="line.150"></a>
-<span class="sourceLineNo">151</span> /**<a name="line.151"></a>
-<span class="sourceLineNo">152</span> * @return the position of the last
Entry returned by next()<a name="line.152"></a>
-<span class="sourceLineNo">153</span> */<a name="line.153"></a>
-<span class="sourceLineNo">154</span> public long getPosition() {<a
name="line.154"></a>
-<span class="sourceLineNo">155</span> return currentPosition;<a
name="line.155"></a>
-<span class="sourceLineNo">156</span> }<a name="line.156"></a>
-<span class="sourceLineNo">157</span><a name="line.157"></a>
-<span class="sourceLineNo">158</span> /**<a name="line.158"></a>
-<span class="sourceLineNo">159</span> * @return the {@link Path} of the
current WAL<a name="line.159"></a>
-<span class="sourceLineNo">160</span> */<a name="line.160"></a>
-<span class="sourceLineNo">161</span> public Path getCurrentPath() {<a
name="line.161"></a>
-<span class="sourceLineNo">162</span> return currentPath;<a
name="line.162"></a>
-<span class="sourceLineNo">163</span> }<a name="line.163"></a>
-<span class="sourceLineNo">164</span><a name="line.164"></a>
-<span class="sourceLineNo">165</span> private String getCurrentPathStat() {<a
name="line.165"></a>
-<span class="sourceLineNo">166</span> StringBuilder sb = new
StringBuilder();<a name="line.166"></a>
-<span class="sourceLineNo">167</span> if (currentPath != null) {<a
name="line.167"></a>
-<span class="sourceLineNo">168</span> sb.append("currently replicating
from: ").append(currentPath).append(" at position: ")<a name="line.168"></a>
-<span class="sourceLineNo">169</span>
.append(currentPosition).append("\n");<a name="line.169"></a>
-<span class="sourceLineNo">170</span> } else {<a name="line.170"></a>
-<span class="sourceLineNo">171</span> sb.append("no replication ongoing,
waiting for new log");<a name="line.171"></a>
-<span class="sourceLineNo">172</span> }<a name="line.172"></a>
-<span class="sourceLineNo">173</span> return sb.toString();<a
name="line.173"></a>
-<span class="sourceLineNo">174</span> }<a name="line.174"></a>
-<span class="sourceLineNo">175</span><a name="line.175"></a>
-<span class="sourceLineNo">176</span> /**<a name="line.176"></a>
-<span class="sourceLineNo">177</span> * Should be called if the stream is to
be reused (i.e. used again after hasNext() has returned<a name="line.177"></a>
-<span class="sourceLineNo">178</span> * false)<a name="line.178"></a>
-<span class="sourceLineNo">179</span> * @throws IOException<a
name="line.179"></a>
-<span class="sourceLineNo">180</span> */<a name="line.180"></a>
-<span class="sourceLineNo">181</span> public void reset() throws IOException
{<a name="line.181"></a>
-<span class="sourceLineNo">182</span> if (reader != null &&
currentPath != null) {<a name="line.182"></a>
-<span class="sourceLineNo">183</span> resetReader();<a
name="line.183"></a>
-<span class="sourceLineNo">184</span> }<a name="line.184"></a>
-<span class="sourceLineNo">185</span> }<a name="line.185"></a>
-<span class="sourceLineNo">186</span><a name="line.186"></a>
-<span class="sourceLineNo">187</span> private void setPosition(long position)
{<a name="line.187"></a>
-<span class="sourceLineNo">188</span> currentPosition = position;<a
name="line.188"></a>
-<span class="sourceLineNo">189</span> }<a name="line.189"></a>
-<span class="sourceLineNo">190</span><a name="line.190"></a>
-<span class="sourceLineNo">191</span> private void setCurrentPath(Path path)
{<a name="line.191"></a>
-<span class="sourceLineNo">192</span> this.currentPath = path;<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> private void tryAdvanceEntry() throws
IOException {<a name="line.195"></a>
-<span class="sourceLineNo">196</span> if (checkReader()) {<a
name="line.196"></a>
-<span class="sourceLineNo">197</span> readNextEntryAndSetPosition();<a
name="line.197"></a>
-<span class="sourceLineNo">198</span> if (currentEntry == null) { // no
more entries in this log file - see if log was rolled<a name="line.198"></a>
-<span class="sourceLineNo">199</span> if (logQueue.size() > 1) { //
log was rolled<a name="line.199"></a>
-<span class="sourceLineNo">200</span> // Before dequeueing, we should
always get one more attempt at reading.<a name="line.200"></a>
-<span class="sourceLineNo">201</span> // This is in case more entries
came in after we opened the reader,<a name="line.201"></a>
-<span class="sourceLineNo">202</span> // and a new log was enqueued
while we were reading. See HBASE-6758<a name="line.202"></a>
-<span class="sourceLineNo">203</span> resetReader();<a
name="line.203"></a>
-<span class="sourceLineNo">204</span>
readNextEntryAndSetPosition();<a name="line.204"></a>
-<span class="sourceLineNo">205</span> if (currentEntry == null) {<a
name="line.205"></a>
-<span class="sourceLineNo">206</span> if (checkAllBytesParsed()) {
// now we're certain we're done with this log file<a name="line.206"></a>
-<span class="sourceLineNo">207</span> dequeueCurrentLog();<a
name="line.207"></a>
-<span class="sourceLineNo">208</span> if (openNextLog()) {<a
name="line.208"></a>
-<span class="sourceLineNo">209</span>
readNextEntryAndSetPosition();<a name="line.209"></a>
-<span class="sourceLineNo">210</span> }<a name="line.210"></a>
-<span class="sourceLineNo">211</span> }<a name="line.211"></a>
-<span class="sourceLineNo">212</span> }<a name="line.212"></a>
-<span class="sourceLineNo">213</span> } // no other logs, we've simply
hit the end of the current open log. Do nothing<a name="line.213"></a>
-<span class="sourceLineNo">214</span> }<a name="line.214"></a>
-<span class="sourceLineNo">215</span> }<a name="line.215"></a>
-<span class="sourceLineNo">216</span> // do nothing if we don't have a WAL
Reader (e.g. if there's no logs in queue)<a name="line.216"></a>
-<span class="sourceLineNo">217</span> }<a name="line.217"></a>
-<span class="sourceLineNo">218</span><a name="line.218"></a>
-<span class="sourceLineNo">219</span> // HBASE-15984 check to see we have in
fact parsed all data in a cleanly closed file<a name="line.219"></a>
-<span class="sourceLineNo">220</span> private boolean checkAllBytesParsed()
throws IOException {<a name="line.220"></a>
-<span class="sourceLineNo">221</span> // -1 means the wal wasn't closed
cleanly.<a name="line.221"></a>
-<span class="sourceLineNo">222</span> final long trailerSize =
currentTrailerSize();<a name="line.222"></a>
-<span class="sourceLineNo">223</span> FileStatus stat = null;<a
name="line.223"></a>
-<span class="sourceLineNo">224</span> try {<a name="line.224"></a>
-<span class="sourceLineNo">225</span> stat =
fs.getFileStatus(this.currentPath);<a name="line.225"></a>
-<span class="sourceLineNo">226</span> } catch (IOException exception) {<a
name="line.226"></a>
-<span class="sourceLineNo">227</span> LOG.warn("Couldn't get file length
information about log " + this.currentPath + ", it "<a name="line.227"></a>
-<span class="sourceLineNo">228</span> + (trailerSize < 0 ? "was
not" : "was") + " closed cleanly " + getCurrentPathStat());<a
name="line.228"></a>
-<span class="sourceLineNo">229</span>
metrics.incrUnknownFileLengthForClosedWAL();<a name="line.229"></a>
-<span class="sourceLineNo">230</span> }<a name="line.230"></a>
-<span class="sourceLineNo">231</span> if (stat != null) {<a
name="line.231"></a>
-<span class="sourceLineNo">232</span> if (trailerSize < 0) {<a
name="line.232"></a>
-<span class="sourceLineNo">233</span> if (currentPosition <
stat.getLen()) {<a name="line.233"></a>
-<span class="sourceLineNo">234</span> final long skippedBytes =
stat.getLen() - currentPosition;<a name="line.234"></a>
-<span class="sourceLineNo">235</span> LOG.info("Reached the end of
WAL file '" + currentPath<a name="line.235"></a>
-<span class="sourceLineNo">236</span> + "'. It was not closed
cleanly, so we did not parse " + skippedBytes<a name="line.236"></a>
-<span class="sourceLineNo">237</span> + " bytes of data.");<a
name="line.237"></a>
-<span class="sourceLineNo">238</span>
metrics.incrUncleanlyClosedWALs();<a name="line.238"></a>
-<span class="sourceLineNo">239</span>
metrics.incrBytesSkippedInUncleanlyClosedWALs(skippedBytes);<a
name="line.239"></a>
-<span class="sourceLineNo">240</span> }<a name="line.240"></a>
-<span class="sourceLineNo">241</span> } else if (currentPosition +
trailerSize < stat.getLen()) {<a name="line.241"></a>
-<span class="sourceLineNo">242</span> LOG.warn("Processing end of WAL
file '" + currentPath + "'. At position " + currentPosition<a
name="line.242"></a>
-<span class="sourceLineNo">243</span> + ", which is too far away
from reported file length " + stat.getLen()<a name="line.243"></a>
-<span class="sourceLineNo">244</span> + ". Restarting WAL reading
(see HBASE-15983 for details). " + getCurrentPathStat());<a name="line.244"></a>
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name="line.245"></a>
-<span class="sourceLineNo">246</span> resetReader();<a
name="line.246"></a>
-<span class="sourceLineNo">247</span>
metrics.incrRestartedWALReading();<a name="line.247"></a>
-<span class="sourceLineNo">248</span>
metrics.incrRepeatedFileBytes(currentPosition);<a name="line.248"></a>
-<span class="sourceLineNo">249</span> return false;<a
name="line.249"></a>
-<span class="sourceLineNo">250</span> }<a name="line.250"></a>
-<span class="sourceLineNo">251</span> }<a name="line.251"></a>
-<span class="sourceLineNo">252</span> if (LOG.isTraceEnabled()) {<a
name="line.252"></a>
-<span class="sourceLineNo">253</span> LOG.trace("Reached the end of log "
+ this.currentPath + ", and the length of the file is "<a name="line.253"></a>
-<span class="sourceLineNo">254</span> + (stat == null ? "N/A" :
stat.getLen()));<a name="line.254"></a>
-<span class="sourceLineNo">255</span> }<a name="line.255"></a>
-<span class="sourceLineNo">256</span> metrics.incrCompletedWAL();<a
name="line.256"></a>
-<span class="sourceLineNo">257</span> return true;<a name="line.257"></a>
-<span class="sourceLineNo">258</span> }<a name="line.258"></a>
-<span class="sourceLineNo">259</span><a name="line.259"></a>
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IOException {<a name="line.260"></a>
-<span class="sourceLineNo">261</span> if (LOG.isDebugEnabled()) {<a
name="line.261"></a>
-<span class="sourceLineNo">262</span> LOG.debug("Reached the end of log "
+ currentPath);<a name="line.262"></a>
-<span class="sourceLineNo">263</span> }<a name="line.263"></a>
-<span class="sourceLineNo">264</span> closeReader();<a name="line.264"></a>
-<span class="sourceLineNo">265</span> logQueue.remove();<a
name="line.265"></a>
-<span class="sourceLineNo">266</span> setPosition(0);<a name="line.266"></a>
-<span class="sourceLineNo">267</span> metrics.decrSizeOfLogQueue();<a
name="line.267"></a>
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-<span class="sourceLineNo">269</span><a name="line.269"></a>
-<span class="sourceLineNo">270</span> private void
readNextEntryAndSetPosition() throws IOException {<a name="line.270"></a>
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name="line.271"></a>
-<span class="sourceLineNo">272</span> long readerPos =
reader.getPosition();<a name="line.272"></a>
-<span class="sourceLineNo">273</span> if (readEntry != null) {<a
name="line.273"></a>
-<span class="sourceLineNo">274</span> metrics.incrLogEditsRead();<a
name="line.274"></a>
-<span class="sourceLineNo">275</span>
metrics.incrLogReadInBytes(readerPos - currentPosition);<a name="line.275"></a>
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waiting for new log");<a name="line.172"></a>
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+<span class="sourceLineNo">176</span><a name="line.176"></a>
+<span class="sourceLineNo">177</span> /**<a name="line.177"></a>
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be reused (i.e. used again after hasNext() has returned<a name="line.178"></a>
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name="line.180"></a>
+<span class="sourceLineNo">181</span> */<a name="line.181"></a>
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{<a name="line.182"></a>
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currentPath != null) {<a name="line.183"></a>
+<span class="sourceLineNo">184</span> resetReader();<a
name="line.184"></a>
+<span class="sourceLineNo">185</span> }<a name="line.185"></a>
+<span class="sourceLineNo">186</span> }<a name="line.186"></a>
+<span class="sourceLineNo">187</span><a name="line.187"></a>
+<span class="sourceLineNo">188</span> private void setPosition(long position)
{<a name="line.188"></a>
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name="line.189"></a>
+<span class="sourceLineNo">190</span> }<a name="line.190"></a>
+<span class="sourceLineNo">191</span><a name="line.191"></a>
+<span class="sourceLineNo">192</span> private void setCurrentPath(Path path)
{<a name="line.192"></a>
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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> private void tryAdvanceEntry() throws
IOException {<a name="line.196"></a>
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name="line.197"></a>
+<span class="sourceLineNo">198</span> readNextEntryAndSetPosition();<a
name="line.198"></a>
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more entries in this log file - see if log was rolled<a name="line.199"></a>
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log was rolled<a name="line.200"></a>
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always get one more attempt at reading.<a name="line.201"></a>
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came in after we opened the reader,<a name="line.202"></a>
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while we were reading. See HBASE-6758<a name="line.203"></a>
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name="line.204"></a>
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readNextEntryAndSetPosition();<a name="line.205"></a>
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name="line.206"></a>
+<span class="sourceLineNo">207</span> if (checkAllBytesParsed()) {
// now we're certain we're done with this log file<a name="line.207"></a>
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name="line.208"></a>
+<span class="sourceLineNo">209</span> if (openNextLog()) {<a
name="line.209"></a>
+<span class="sourceLineNo">210</span>
readNextEntryAndSetPosition();<a name="line.210"></a>
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+<span class="sourceLineNo">212</span> }<a name="line.212"></a>
+<span class="sourceLineNo">213</span> }<a name="line.213"></a>
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hit the end of the current open log. Do nothing<a name="line.214"></a>
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Reader (e.g. if there's no logs in queue)<a name="line.217"></a>
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+<span class="sourceLineNo">219</span><a name="line.219"></a>
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fact parsed all data in a cleanly closed file<a name="line.220"></a>
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throws IOException {<a name="line.221"></a>
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cleanly.<a name="line.222"></a>
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currentTrailerSize();<a name="line.223"></a>
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name="line.224"></a>
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+<span class="sourceLineNo">226</span> stat =
fs.getFileStatus(this.currentPath);<a name="line.226"></a>
+<span class="sourceLineNo">227</span> } catch (IOException exception) {<a
name="line.227"></a>
+<span class="sourceLineNo">228</span> LOG.warn("Couldn't get file length
information about log " + this.currentPath + ", it "<a name="line.228"></a>
+<span class="sourceLineNo">229</span> + (trailerSize < 0 ? "was
not" : "was") + " closed cleanly " + getCurrentPathStat());<a
name="line.229"></a>
+<span class="sourceLineNo">230</span>
metrics.incrUnknownFileLengthForClosedWAL();<a name="line.230"></a>
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stat.getLen()) {<a name="line.234"></a>
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stat.getLen() - currentPosition;<a name="line.235"></a>
+<span class="sourceLineNo">236</span> LOG.info("Reached the end of
WAL file '" + currentPath<a name="line.236"></a>
+<span class="sourceLineNo">237</span> + "'. It was not closed
cleanly, so we did not parse " + skippedBytes<a name="line.237"></a>
+<span class="sourceLineNo">238</span> + " bytes of data.");<a
name="line.238"></a>
+<span class="sourceLineNo">239</span>
metrics.incrUncleanlyClosedWALs();<a name="line.239"></a>
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metrics.incrBytesSkippedInUncleanlyClosedWALs(skippedBytes);<a
name="line.240"></a>
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+<span class="sourceLineNo">242</span> } else if (currentPosition +
trailerSize < stat.getLen()) {<a name="line.242"></a>
+<span class="sourceLineNo">243</span> LOG.warn("Processing end of WAL
file '" + currentPath + "'. At position " + currentPosition<a
name="line.243"></a>
+<span class="sourceLineNo">244</span> + ", which is too far away
from reported file length " + stat.getLen()<a name="line.244"></a>
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(see HBASE-15983 for details). " + getCurrentPathStat());<a name="line.245"></a>
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name="line.246"></a>
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name="line.247"></a>
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metrics.incrRestartedWALReading();<a name="line.248"></a>
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metrics.incrRepeatedFileBytes(currentPosition);<a name="line.249"></a>
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name="line.250"></a>
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+<span class="sourceLineNo">252</span> }<a name="line.252"></a>
+<span class="sourceLineNo">253</span> if (LOG.isTraceEnabled()) {<a
name="line.253"></a>
+<span class="sourceLineNo">254</span> LOG.trace("Reached the end of log "
+ this.currentPath + ", and the length of the file is "<a name="line.254"></a>
+<span class="sourceLineNo">255</span> + (stat == null ? "N/A" :
stat.getLen()));<a name="line.255"></a>
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name="line.257"></a>
+<span class="sourceLineNo">258</span> return true;<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>
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IOException {<a name="line.261"></a>
+<span class="sourceLineNo">262</span> if (LOG.isDebugEnabled()) {<a
name="line.262"></a>
+<span class="sourceLineNo">263</span> LOG.debug("Reached the end of log "
+ currentPath);<a name="line.263"></a>
+<span class="sourceLineNo">264</span> }<a name="line.264"></a>
+<span class="sourceLineNo">265</span> closeReader();<a name="line.265"></a>
+<span class="sourceLineNo">266</span> logQueue.remove();<a
name="line.266"></a>
+<span class="sourceLineNo">267</span> setPosition(0);<a name="line.267"></a>
+<span class="sourceLineNo">268</span> metrics.decrSizeOfLogQueue();<a
name="line.268"></a>
+<span class="sourceLineNo">269</span> }<a name="line.269"></a>
+<span class="sourceLineNo">270</span><a name="line.270"></a>
+<span class="sourceLineNo">271</span> private void
readNextEntryAndSetPosition() throws IOException {<a name="line.271"></a>
+<span class="sourceLineNo">272</span> Entry readEntry = reader.next();<a
name="line.272"></a>
+<span class="sourceLineNo">273</span> long readerPos =
reader.getPosition();<a name="line.273"></a>
+<span class="sourceLineNo">274</span> if (readEntry != null) {<a
name="line.274"></a>
+<span class="sourceLineNo">275</span> metrics.incrLogEditsRead();<a
name="line.275"></a>
+<span class="sourceLineNo">276</span>
metrics.incrLogReadInBytes(readerPos - currentPosition);<a name="line.276"></a>
+<span class="sourceLineNo">277</span> }<a name="line.277"></a>
+<span class="sourceLineNo">278</span> currentEntry = readEntry; // could be
null<a name="line.278"></a>
+<span class="sourceLineNo">279</span> setPosition(readerPos);<a
name="line.279"></a>
+<span class="sourceLineNo">280</span> }<a name="line.280"></a>
+<span class="sourceLineNo">281</span><a name="line.281"></a>
+<span class="sourceLineNo">282</span> private void closeReader() throws
IOException {<a name="line.282"></a>
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name="line.283"></a>
+<span class="sourceLineNo">284</span> reader.close();<a
name="line.284"></a>
+<span class="sourceLineNo">285</span> reader = null;<a
name="line.285"></a>
+<span class="sourceLineNo">286</span> }<a name="line.286"></a>
+<span class="sourceLineNo">287</span> }<a name="line.287"></a>
+<span class="sourceLineNo">288</span><a name="line.288"></a>
+<span class="sourceLineNo">289</span> // if we don't have a reader, open a
reader on the next log<a name="line.289"></a>
+<span class="sourceLineNo">290</span> private boolean checkReader() throws
IOException {<a name="line.290"></a>
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name="line.291"></a>
+<span class="sourceLineNo">292</span> return openNextLog();<a
name="line.292"></a>
+<span class="sourceLineNo">293</span> }<a name="line.293"></a>
+<span class="sourceLineNo">294</span> return true;<a name="line.294"></a>
+<span class="sourceLineNo">295</span> }<a name="line.295"></a>
+<span class="sourceLineNo">296</span><a name="line.296"></a>
+<span class="sourceLineNo">297</span> // open a reader on the next log in
queue<a name="line.297"></a>
+<span class="sourceLineNo">298</span> private boolean openNextLog() throws
IOException {<a name="line.298"></a>
+<span class="sourceLineNo">299</span> Path nextPath = logQueue.peek();<a
name="line.299"></a>
+<span class="sourceLineNo">300</span> if (nextPath != null) {<a
name="line.300"></a>
+<span class="sourceLineNo">301</span> openReader(nextPath);<a
name="line.301"></a>
+<span class="sourceLineNo">302</span> if (reader != null) return true;<a
name="line.302"></a>
+<span class="sourceLineNo">303</span> }<a name="line.303"></a>
+<span class="sourceLineNo">304</span> return false;<a name="line.304"></a>
+<span class="sourceLineNo">305</span> }<a name="line.305"></a>
+<span class="sourceLineNo">306</span><a name="line.306"></a>
+<span class="sourceLineNo">307</span> private Path getArchivedLog(Path path)
throws IOException {<a name="line.307"></a>
+<span class="sourceLineNo">308</span> Path rootDir =
FSUtils.getRootDir(conf);<a name="line.308"></a>
+<span class="sourceLineNo">309</span> Path oldLogDir = new Path(rootDir,
HConstants.HREGION_OLDLOGDIR_NAME);<a name="line.309"></a>
+<span class="sourceLineNo">310</span> Path archivedLogLocation = new
Path(oldLogDir, path.getName());<a name="line.310"></a>
+<span class="sourceLineNo">311</span> if (fs.exists(archivedLogLocation))
{<a name="line.311"></a>
+<span class="sourceLineNo">312</span> LOG.info("Log " + path + " was
moved to " + archivedLogLocation);<a name="line.312"></a>
+<span class="sourceLineNo">313</span> return archivedLogLocation;<a
name="line.313"></a>
+<span class="sourceLineNo">314</span> } else {<a name="line.314"></a>
+<span class="sourceLineNo">315</span> LOG.error("Couldn't locate log: " +
path);<a name="line.315"></a>
+<span class="sourceLineNo">316</span> return path;<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><a name="line.319"></a>
+<span class="sourceLineNo">320</span> private void handleFileNotFound(Path
path, FileNotFoundException fnfe) throws IOException {<a name="line.320"></a>
+<span class="sourceLineNo">321</span> // If the log was archived, continue
reading from there<a name="line.321"></a>
+<span class="sourceLineNo">322</span> Path archivedLog =
getArchivedLog(path);<a name="line.322"></a>
+<span class="sourceLineNo">323</span> if (!path.equals(archivedLog)) {<a
name="line.323"></a>
+<span class="sourceLineNo">324</span> openReader(archivedLog);<a
name="line.324"></a>
+<span class="sourceLineNo">325</span> } else {<a name="line.325"></a>
+<span class="sourceLineNo">326</span> throw fnfe;<a name="line.326"></a>
+<span class="sourceLineNo">327</span> }<a name="line.327"></a>
+<span class="sourceLineNo">328</span> }<a name="line.328"></a>
+<span class="sourceLineNo">329</span> private void openReader(Path path)
throws IOException {<a name="line.329"></a>
+<span class="sourceLineNo">330</span> try {<a name="line.330"></a>
+<span class="sourceLineNo">331</span> // Detect if this is a new file, if
so get a new reader else<a name="line.331"></a>
+<span class="sourceLineNo">332</span> // reset the current reader so that
we see the new data<a name="line.332"></a>
+<span class="sourceLineNo">333</span> if (reader == null ||
!getCurrentPath().equals(path)) {<a name="line.333"></a>
+<span class="sourceLineNo">334</span> closeReader();<a
name="line.334"></a>
+<span class="sourceLineNo">335</span> reader =
WALFactory.createReader(fs, path, conf);<a name="line.335"></a>
+<span class="sourceLineNo">336</span> seek();<a name="line.336"></a>
+<span class="sourceLineNo">337</span> setCurrentPath(path);<a
name="line.337"></a>
+<span class="sourceLineNo">338</span> } else {<a name="line.338"></a>
+<span class="sourceLineNo">339</span> resetReader();<a
name="line.339"></a>
+<span class="sourceLineNo">340</span> }<a name="line.340"></a>
+<span class="sourceLineNo">341</span> } catch (FileNotFoundException fnfe)
{<a name="line.341"></a>
+<span class="sourceLineNo">342</span> handleFileNotFound(path, fnfe);<a
name="line.342"></a>
+<span class="sourceLineNo">343</span> } catch (RemoteException re) {<a
name="line.343"></a>
+<span class="sourceLineNo">344</span> IOException ioe =
re.unwrapRemoteException(FileNotFoundException.class);<a name="line.344"></a>
+<span class="sourceLineNo">345</span> if (!(ioe instanceof
FileNotFoundException)) throw ioe;<a name="line.345"></a>
+<span class="sourceLineNo">346</span> handleFileNotFound(path,
(FileNotFoundException)ioe);<a name="line.346"></a>
+<span class="sourceLineNo">347</span> } catch (LeaseNotRecoveredException
lnre) {<a name="line.347"></a>
+<span class="sourceLineNo">348</span> // HBASE-15019 the WAL was not
closed due to some hiccup.<a name="line.348"></a>
+<span class="sourceLineNo">349</span> LOG.warn("Try to recover the WAL
lease " + currentPath, lnre);<a name="line.349"></a>
+<span class="sourceLineNo">350</span> recoverLease(conf, currentPath);<a
name="line.350"></a>
+<span class="sourceLineNo">351</span> reader = null;<a
name="line.351"></a>
+<span class="sourceLineNo">352</span> } catch (NullPointerException npe)
{<a name="line.352"></a>
+<span class="sourceLineNo">353</span> // Workaround for race condition in
HDFS-4380<a name="line.353"></a>
+<span class="sourceLineNo">354</span> // which throws a NPE if we open a
file before any data node has the most recent block<a name="line.354"></a>
+<span class="sourceLineNo">355</span> // Just sleep and retry. Will
require re-reading compressed WALs for compressionContext.<a
name="line.355"></a>
+<span class="sourceLineNo">356</span> LOG.warn("Got NPE opening reader,
will retry.");<a name="line.356"></a>
+<span class="sourceLineNo">357</span> reader = null;<a
name="line.357"></a>
+<span class="sourceLineNo">358</span> }<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> // For HBASE-15019<a
name="line.361"></a>
+<span class="sourceLineNo">362</span> private void recoverLease(final
Configuration conf, final Path path) {<a name="line.362"></a>
+<span class="sourceLineNo">363</span> try {<a name="line.363"></a>
+<span class="sourceLineNo">364</span> final FileSystem dfs =
FSUtils.getCurrentFileSystem(conf);<a name="line.364"></a>
+<span class="sourceLineNo">365</span> FSUtils fsUtils =
FSUtils.getInstance(dfs, conf);<a name="line.365"></a>
+<span class="sourceLineNo">366</span> fsUtils.recoverFileLease(dfs, path,
conf, new CancelableProgressable() {<a name="line.366"></a>
+<span class="sourceLineNo">367</span> @Override<a name="line.367"></a>
+<span class="sourceLineNo">368</span> public boolean progress() {<a
name="line.368"></a>
+<span class="sourceLineNo">369</span> LOG.debug("recover WAL lease: "
+ path);<a name="line.369"></a>
+<span class="sourceLineNo">370</span> return true;<a
name="line.370"></a>
+<span class="sourceLineNo">371</span> }<a name="line.371"></a>
+<span class="sourceLineNo">372</span> });<a name="line.372"></a>
+<span class="sourceLineNo">373</span> } catch (IOException e) {<a
name="line.373"></a>
+<span class="sourceLineNo">374</span> LOG.warn("unable to recover lease
for WAL: " + path, e);<a name="line.374"></a>
+<span class="sourceLineNo">375</span> }<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> private void resetReader() throws
IOException {<a name="line.378"></a>
+<span class="sourceLineNo">379</span> try {<a name="line.379"></a>
+<span class="sourceLineNo">380</span> reader.reset();<a
name="line.380"></a>
+<span class="sourceLineNo">381</span> seek();<a name="line.381"></a>
+<span class="sourceLineNo">382</span> } catch (FileNotFoundException fnfe)
{<a name="line.382"></a>
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continue reading from there<a name="line.383"></a>
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getArchivedLog(currentPath);<a name="line.384"></a>
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(!currentPath.equals(archivedLog)) {<a name="line.385"></a>
+<span class="sourceLineNo">386</span> openReader(archivedLog);<a
name="line.386"></a>
+<span class="sourceLineNo">387</span> } else {<a name="line.387"></a>
+<span class="sourceLineNo">388</span> throw fnfe;<a name="line.388"></a>
+<span class="sourceLineNo">389</span> }<a name="line.389"></a>
+<span class="sourceLineNo">390</span> } catch (NullPointerException npe)
{<a name="line.390"></a>
+<span class="sourceLineNo">391</span> throw new IOException("NPE
resetting reader, likely HDFS-4380", npe);<a name="line.391"></a>
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+<span class="sourceLineNo">393</span> }<a name="line.393"></a>
+<span class="sourceLineNo">394</span><a name="line.394"></a>
+<span class="sourceLineNo">395</span> private void seek() throws IOException
{<a name="line.395"></a>
+<span class="sourceLineNo">396</span> if (currentPosition != 0) {<a
name="line.396"></a>
+<span class="sourceLineNo">397</span> reader.seek(currentPosition);<a
name="line.397"></a>
<span class="sourceLineNo">398</span> }<a name="line.398"></a>
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-<span class="sourceLineNo">402</span> @InterfaceAudience.Private<a
name="line.402"></a>
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