http://git-wip-us.apache.org/repos/asf/hbase-site/blob/6eb695c8/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html index 9971079..03c8b000 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html @@ -49,1067 +49,1082 @@ <span class="sourceLineNo">041</span>import org.apache.hadoop.fs.Path;<a name="line.41"></a> <span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.HConstants;<a name="line.42"></a> <span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.43"></a> -<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.44"></a> -<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.45"></a> -<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.46"></a> -<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.util.FSUtils;<a name="line.47"></a> -<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.util.HasThread;<a name="line.48"></a> -<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.49"></a> -<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.wal.FSHLogProvider;<a name="line.50"></a> -<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.wal.WALEdit;<a name="line.51"></a> -<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.wal.WALKeyImpl;<a name="line.52"></a> -<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.wal.WALProvider.Writer;<a name="line.53"></a> -<span class="sourceLineNo">054</span>import org.apache.hadoop.hdfs.DFSOutputStream;<a name="line.54"></a> -<span class="sourceLineNo">055</span>import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;<a name="line.55"></a> -<span class="sourceLineNo">056</span>import org.apache.hadoop.hdfs.protocol.DatanodeInfo;<a name="line.56"></a> -<span class="sourceLineNo">057</span>import org.apache.htrace.core.TraceScope;<a name="line.57"></a> -<span class="sourceLineNo">058</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.58"></a> -<span class="sourceLineNo">059</span>import org.slf4j.Logger;<a name="line.59"></a> -<span class="sourceLineNo">060</span>import org.slf4j.LoggerFactory;<a name="line.60"></a> -<span class="sourceLineNo">061</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.61"></a> -<span class="sourceLineNo">062</span><a name="line.62"></a> -<span class="sourceLineNo">063</span>/**<a name="line.63"></a> -<span class="sourceLineNo">064</span> * The default implementation of FSWAL.<a name="line.64"></a> -<span class="sourceLineNo">065</span> */<a name="line.65"></a> -<span class="sourceLineNo">066</span>@InterfaceAudience.Private<a name="line.66"></a> -<span class="sourceLineNo">067</span>public class FSHLog extends AbstractFSWAL<Writer> {<a name="line.67"></a> -<span class="sourceLineNo">068</span> // IMPLEMENTATION NOTES:<a name="line.68"></a> -<span class="sourceLineNo">069</span> //<a name="line.69"></a> -<span class="sourceLineNo">070</span> // At the core is a ring buffer. Our ring buffer is the LMAX Disruptor. It tries to<a name="line.70"></a> -<span class="sourceLineNo">071</span> // minimize synchronizations and volatile writes when multiple contending threads as is the case<a name="line.71"></a> -<span class="sourceLineNo">072</span> // here appending and syncing on a single WAL. The Disruptor is configured to handle multiple<a name="line.72"></a> -<span class="sourceLineNo">073</span> // producers but it has one consumer only (the producers in HBase are IPC Handlers calling append<a name="line.73"></a> -<span class="sourceLineNo">074</span> // and then sync). The single consumer/writer pulls the appends and syncs off the ring buffer.<a name="line.74"></a> -<span class="sourceLineNo">075</span> // When a handler calls sync, it is given back a future. The producer 'blocks' on the future so<a name="line.75"></a> -<span class="sourceLineNo">076</span> // it does not return until the sync completes. The future is passed over the ring buffer from<a name="line.76"></a> -<span class="sourceLineNo">077</span> // the producer/handler to the consumer thread where it does its best to batch up the producer<a name="line.77"></a> -<span class="sourceLineNo">078</span> // syncs so one WAL sync actually spans multiple producer sync invocations. How well the<a name="line.78"></a> -<span class="sourceLineNo">079</span> // batching works depends on the write rate; i.e. we tend to batch more in times of<a name="line.79"></a> -<span class="sourceLineNo">080</span> // high writes/syncs.<a name="line.80"></a> -<span class="sourceLineNo">081</span> //<a name="line.81"></a> -<span class="sourceLineNo">082</span> // Calls to append now also wait until the append has been done on the consumer side of the<a name="line.82"></a> -<span class="sourceLineNo">083</span> // disruptor. We used to not wait but it makes the implementation easier to grok if we have<a name="line.83"></a> -<span class="sourceLineNo">084</span> // the region edit/sequence id after the append returns.<a name="line.84"></a> -<span class="sourceLineNo">085</span> //<a name="line.85"></a> -<span class="sourceLineNo">086</span> // TODO: Handlers need to coordinate appending AND syncing. Can we have the threads contend<a name="line.86"></a> -<span class="sourceLineNo">087</span> // once only? Probably hard given syncs take way longer than an append.<a name="line.87"></a> -<span class="sourceLineNo">088</span> //<a name="line.88"></a> -<span class="sourceLineNo">089</span> // The consumer threads pass the syncs off to multiple syncing threads in a round robin fashion<a name="line.89"></a> -<span class="sourceLineNo">090</span> // to ensure we keep up back-to-back FS sync calls (FS sync calls are the long poll writing the<a name="line.90"></a> -<span class="sourceLineNo">091</span> // WAL). The consumer thread passes the futures to the sync threads for it to complete<a name="line.91"></a> -<span class="sourceLineNo">092</span> // the futures when done.<a name="line.92"></a> -<span class="sourceLineNo">093</span> //<a name="line.93"></a> -<span class="sourceLineNo">094</span> // The 'sequence' in the below is the sequence of the append/sync on the ringbuffer. It<a name="line.94"></a> -<span class="sourceLineNo">095</span> // acts as a sort-of transaction id. It is always incrementing.<a name="line.95"></a> -<span class="sourceLineNo">096</span> //<a name="line.96"></a> -<span class="sourceLineNo">097</span> // The RingBufferEventHandler class hosts the ring buffer consuming code. The threads that<a name="line.97"></a> -<span class="sourceLineNo">098</span> // do the actual FS sync are implementations of SyncRunner. SafePointZigZagLatch is a<a name="line.98"></a> -<span class="sourceLineNo">099</span> // synchronization class used to halt the consumer at a safe point -- just after all outstanding<a name="line.99"></a> -<span class="sourceLineNo">100</span> // syncs and appends have completed -- so the log roller can swap the WAL out under it.<a name="line.100"></a> -<span class="sourceLineNo">101</span> //<a name="line.101"></a> -<span class="sourceLineNo">102</span> // We use ring buffer sequence as txid of FSWALEntry and SyncFuture.<a name="line.102"></a> -<span class="sourceLineNo">103</span> private static final Logger LOG = LoggerFactory.getLogger(FSHLog.class);<a name="line.103"></a> -<span class="sourceLineNo">104</span><a name="line.104"></a> -<span class="sourceLineNo">105</span> /**<a name="line.105"></a> -<span class="sourceLineNo">106</span> * The nexus at which all incoming handlers meet. Does appends and sync with an ordering. Appends<a name="line.106"></a> -<span class="sourceLineNo">107</span> * and syncs are each put on the ring which means handlers need to smash up against the ring twice<a name="line.107"></a> -<span class="sourceLineNo">108</span> * (can we make it once only? ... maybe not since time to append is so different from time to sync<a name="line.108"></a> -<span class="sourceLineNo">109</span> * and sometimes we don't want to sync or we want to async the sync). The ring is where we make<a name="line.109"></a> -<span class="sourceLineNo">110</span> * sure of our ordering and it is also where we do batching up of handler sync calls.<a name="line.110"></a> -<span class="sourceLineNo">111</span> */<a name="line.111"></a> -<span class="sourceLineNo">112</span> private final Disruptor<RingBufferTruck> disruptor;<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> * This fellow is run by the above appendExecutor service but it is all about batching up appends<a name="line.115"></a> -<span class="sourceLineNo">116</span> * and syncs; it may shutdown without cleaning out the last few appends or syncs. To guard against<a name="line.116"></a> -<span class="sourceLineNo">117</span> * this, keep a reference to this handler and do explicit close on way out to make sure all<a name="line.117"></a> -<span class="sourceLineNo">118</span> * flushed out before we exit.<a name="line.118"></a> -<span class="sourceLineNo">119</span> */<a name="line.119"></a> -<span class="sourceLineNo">120</span> private final RingBufferEventHandler ringBufferEventHandler;<a name="line.120"></a> -<span class="sourceLineNo">121</span><a name="line.121"></a> -<span class="sourceLineNo">122</span> /**<a name="line.122"></a> -<span class="sourceLineNo">123</span> * FSDataOutputStream associated with the current SequenceFile.writer<a name="line.123"></a> -<span class="sourceLineNo">124</span> */<a name="line.124"></a> -<span class="sourceLineNo">125</span> private FSDataOutputStream hdfs_out;<a name="line.125"></a> -<span class="sourceLineNo">126</span><a name="line.126"></a> -<span class="sourceLineNo">127</span> // All about log rolling if not enough replicas outstanding.<a name="line.127"></a> -<span class="sourceLineNo">128</span><a name="line.128"></a> -<span class="sourceLineNo">129</span> // Minimum tolerable replicas, if the actual value is lower than it, rollWriter will be triggered<a name="line.129"></a> -<span class="sourceLineNo">130</span> private final int minTolerableReplication;<a name="line.130"></a> -<span class="sourceLineNo">131</span><a name="line.131"></a> -<span class="sourceLineNo">132</span> // If live datanode count is lower than the default replicas value,<a name="line.132"></a> -<span class="sourceLineNo">133</span> // RollWriter will be triggered in each sync(So the RollWriter will be<a name="line.133"></a> -<span class="sourceLineNo">134</span> // triggered one by one in a short time). Using it as a workaround to slow<a name="line.134"></a> -<span class="sourceLineNo">135</span> // down the roll frequency triggered by checkLowReplication().<a name="line.135"></a> -<span class="sourceLineNo">136</span> private final AtomicInteger consecutiveLogRolls = new AtomicInteger(0);<a name="line.136"></a> -<span class="sourceLineNo">137</span><a name="line.137"></a> -<span class="sourceLineNo">138</span> private final int lowReplicationRollLimit;<a name="line.138"></a> -<span class="sourceLineNo">139</span><a name="line.139"></a> -<span class="sourceLineNo">140</span> // If consecutiveLogRolls is larger than lowReplicationRollLimit,<a name="line.140"></a> -<span class="sourceLineNo">141</span> // then disable the rolling in checkLowReplication().<a name="line.141"></a> -<span class="sourceLineNo">142</span> // Enable it if the replications recover.<a name="line.142"></a> -<span class="sourceLineNo">143</span> private volatile boolean lowReplicationRollEnabled = true;<a name="line.143"></a> -<span class="sourceLineNo">144</span><a name="line.144"></a> -<span class="sourceLineNo">145</span> /** Number of log close errors tolerated before we abort */<a name="line.145"></a> -<span class="sourceLineNo">146</span> private final int closeErrorsTolerated;<a name="line.146"></a> +<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.regionserver.HRegion;<a name="line.44"></a> +<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.45"></a> +<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.46"></a> +<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.47"></a> +<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.util.FSUtils;<a name="line.48"></a> +<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.util.HasThread;<a name="line.49"></a> +<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.50"></a> +<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.wal.FSHLogProvider;<a name="line.51"></a> +<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.wal.WALEdit;<a name="line.52"></a> +<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.wal.WALKeyImpl;<a name="line.53"></a> +<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.wal.WALProvider.Writer;<a name="line.54"></a> +<span class="sourceLineNo">055</span>import org.apache.hadoop.hdfs.DFSOutputStream;<a name="line.55"></a> +<span class="sourceLineNo">056</span>import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;<a name="line.56"></a> +<span class="sourceLineNo">057</span>import org.apache.hadoop.hdfs.protocol.DatanodeInfo;<a name="line.57"></a> +<span class="sourceLineNo">058</span>import org.apache.htrace.core.TraceScope;<a name="line.58"></a> +<span class="sourceLineNo">059</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.59"></a> +<span class="sourceLineNo">060</span>import org.slf4j.Logger;<a name="line.60"></a> +<span class="sourceLineNo">061</span>import org.slf4j.LoggerFactory;<a name="line.61"></a> +<span class="sourceLineNo">062</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.62"></a> +<span class="sourceLineNo">063</span><a name="line.63"></a> +<span class="sourceLineNo">064</span>/**<a name="line.64"></a> +<span class="sourceLineNo">065</span> * The default implementation of FSWAL.<a name="line.65"></a> +<span class="sourceLineNo">066</span> */<a name="line.66"></a> +<span class="sourceLineNo">067</span>@InterfaceAudience.Private<a name="line.67"></a> +<span class="sourceLineNo">068</span>public class FSHLog extends AbstractFSWAL<Writer> {<a name="line.68"></a> +<span class="sourceLineNo">069</span> // IMPLEMENTATION NOTES:<a name="line.69"></a> +<span class="sourceLineNo">070</span> //<a name="line.70"></a> +<span class="sourceLineNo">071</span> // At the core is a ring buffer. Our ring buffer is the LMAX Disruptor. It tries to<a name="line.71"></a> +<span class="sourceLineNo">072</span> // minimize synchronizations and volatile writes when multiple contending threads as is the case<a name="line.72"></a> +<span class="sourceLineNo">073</span> // here appending and syncing on a single WAL. The Disruptor is configured to handle multiple<a name="line.73"></a> +<span class="sourceLineNo">074</span> // producers but it has one consumer only (the producers in HBase are IPC Handlers calling append<a name="line.74"></a> +<span class="sourceLineNo">075</span> // and then sync). The single consumer/writer pulls the appends and syncs off the ring buffer.<a name="line.75"></a> +<span class="sourceLineNo">076</span> // When a handler calls sync, it is given back a future. The producer 'blocks' on the future so<a name="line.76"></a> +<span class="sourceLineNo">077</span> // it does not return until the sync completes. The future is passed over the ring buffer from<a name="line.77"></a> +<span class="sourceLineNo">078</span> // the producer/handler to the consumer thread where it does its best to batch up the producer<a name="line.78"></a> +<span class="sourceLineNo">079</span> // syncs so one WAL sync actually spans multiple producer sync invocations. How well the<a name="line.79"></a> +<span class="sourceLineNo">080</span> // batching works depends on the write rate; i.e. we tend to batch more in times of<a name="line.80"></a> +<span class="sourceLineNo">081</span> // high writes/syncs.<a name="line.81"></a> +<span class="sourceLineNo">082</span> //<a name="line.82"></a> +<span class="sourceLineNo">083</span> // Calls to append now also wait until the append has been done on the consumer side of the<a name="line.83"></a> +<span class="sourceLineNo">084</span> // disruptor. We used to not wait but it makes the implementation easier to grok if we have<a name="line.84"></a> +<span class="sourceLineNo">085</span> // the region edit/sequence id after the append returns.<a name="line.85"></a> +<span class="sourceLineNo">086</span> //<a name="line.86"></a> +<span class="sourceLineNo">087</span> // TODO: Handlers need to coordinate appending AND syncing. Can we have the threads contend<a name="line.87"></a> +<span class="sourceLineNo">088</span> // once only? Probably hard given syncs take way longer than an append.<a name="line.88"></a> +<span class="sourceLineNo">089</span> //<a name="line.89"></a> +<span class="sourceLineNo">090</span> // The consumer threads pass the syncs off to multiple syncing threads in a round robin fashion<a name="line.90"></a> +<span class="sourceLineNo">091</span> // to ensure we keep up back-to-back FS sync calls (FS sync calls are the long poll writing the<a name="line.91"></a> +<span class="sourceLineNo">092</span> // WAL). The consumer thread passes the futures to the sync threads for it to complete<a name="line.92"></a> +<span class="sourceLineNo">093</span> // the futures when done.<a name="line.93"></a> +<span class="sourceLineNo">094</span> //<a name="line.94"></a> +<span class="sourceLineNo">095</span> // The 'sequence' in the below is the sequence of the append/sync on the ringbuffer. It<a name="line.95"></a> +<span class="sourceLineNo">096</span> // acts as a sort-of transaction id. It is always incrementing.<a name="line.96"></a> +<span class="sourceLineNo">097</span> //<a name="line.97"></a> +<span class="sourceLineNo">098</span> // The RingBufferEventHandler class hosts the ring buffer consuming code. The threads that<a name="line.98"></a> +<span class="sourceLineNo">099</span> // do the actual FS sync are implementations of SyncRunner. SafePointZigZagLatch is a<a name="line.99"></a> +<span class="sourceLineNo">100</span> // synchronization class used to halt the consumer at a safe point -- just after all outstanding<a name="line.100"></a> +<span class="sourceLineNo">101</span> // syncs and appends have completed -- so the log roller can swap the WAL out under it.<a name="line.101"></a> +<span class="sourceLineNo">102</span> //<a name="line.102"></a> +<span class="sourceLineNo">103</span> // We use ring buffer sequence as txid of FSWALEntry and SyncFuture.<a name="line.103"></a> +<span class="sourceLineNo">104</span> private static final Logger LOG = LoggerFactory.getLogger(FSHLog.class);<a name="line.104"></a> +<span class="sourceLineNo">105</span><a name="line.105"></a> +<span class="sourceLineNo">106</span> /**<a name="line.106"></a> +<span class="sourceLineNo">107</span> * The nexus at which all incoming handlers meet. Does appends and sync with an ordering. Appends<a name="line.107"></a> +<span class="sourceLineNo">108</span> * and syncs are each put on the ring which means handlers need to smash up against the ring twice<a name="line.108"></a> +<span class="sourceLineNo">109</span> * (can we make it once only? ... maybe not since time to append is so different from time to sync<a name="line.109"></a> +<span class="sourceLineNo">110</span> * and sometimes we don't want to sync or we want to async the sync). The ring is where we make<a name="line.110"></a> +<span class="sourceLineNo">111</span> * sure of our ordering and it is also where we do batching up of handler sync calls.<a name="line.111"></a> +<span class="sourceLineNo">112</span> */<a name="line.112"></a> +<span class="sourceLineNo">113</span> private final Disruptor<RingBufferTruck> disruptor;<a name="line.113"></a> +<span class="sourceLineNo">114</span><a name="line.114"></a> +<span class="sourceLineNo">115</span> /**<a name="line.115"></a> +<span class="sourceLineNo">116</span> * This fellow is run by the above appendExecutor service but it is all about batching up appends<a name="line.116"></a> +<span class="sourceLineNo">117</span> * and syncs; it may shutdown without cleaning out the last few appends or syncs. To guard against<a name="line.117"></a> +<span class="sourceLineNo">118</span> * this, keep a reference to this handler and do explicit close on way out to make sure all<a name="line.118"></a> +<span class="sourceLineNo">119</span> * flushed out before we exit.<a name="line.119"></a> +<span class="sourceLineNo">120</span> */<a name="line.120"></a> +<span class="sourceLineNo">121</span> private final RingBufferEventHandler ringBufferEventHandler;<a name="line.121"></a> +<span class="sourceLineNo">122</span><a name="line.122"></a> +<span class="sourceLineNo">123</span> /**<a name="line.123"></a> +<span class="sourceLineNo">124</span> * FSDataOutputStream associated with the current SequenceFile.writer<a name="line.124"></a> +<span class="sourceLineNo">125</span> */<a name="line.125"></a> +<span class="sourceLineNo">126</span> private FSDataOutputStream hdfs_out;<a name="line.126"></a> +<span class="sourceLineNo">127</span><a name="line.127"></a> +<span class="sourceLineNo">128</span> // All about log rolling if not enough replicas outstanding.<a name="line.128"></a> +<span class="sourceLineNo">129</span><a name="line.129"></a> +<span class="sourceLineNo">130</span> // Minimum tolerable replicas, if the actual value is lower than it, rollWriter will be triggered<a name="line.130"></a> +<span class="sourceLineNo">131</span> private final int minTolerableReplication;<a name="line.131"></a> +<span class="sourceLineNo">132</span><a name="line.132"></a> +<span class="sourceLineNo">133</span> private final boolean useHsync;<a name="line.133"></a> +<span class="sourceLineNo">134</span><a name="line.134"></a> +<span class="sourceLineNo">135</span> // If live datanode count is lower than the default replicas value,<a name="line.135"></a> +<span class="sourceLineNo">136</span> // RollWriter will be triggered in each sync(So the RollWriter will be<a name="line.136"></a> +<span class="sourceLineNo">137</span> // triggered one by one in a short time). Using it as a workaround to slow<a name="line.137"></a> +<span class="sourceLineNo">138</span> // down the roll frequency triggered by checkLowReplication().<a name="line.138"></a> +<span class="sourceLineNo">139</span> private final AtomicInteger consecutiveLogRolls = new AtomicInteger(0);<a name="line.139"></a> +<span class="sourceLineNo">140</span><a name="line.140"></a> +<span class="sourceLineNo">141</span> private final int lowReplicationRollLimit;<a name="line.141"></a> +<span class="sourceLineNo">142</span><a name="line.142"></a> +<span class="sourceLineNo">143</span> // If consecutiveLogRolls is larger than lowReplicationRollLimit,<a name="line.143"></a> +<span class="sourceLineNo">144</span> // then disable the rolling in checkLowReplication().<a name="line.144"></a> +<span class="sourceLineNo">145</span> // Enable it if the replications recover.<a name="line.145"></a> +<span class="sourceLineNo">146</span> private volatile boolean lowReplicationRollEnabled = true;<a name="line.146"></a> <span class="sourceLineNo">147</span><a name="line.147"></a> -<span class="sourceLineNo">148</span> private final AtomicInteger closeErrorCount = new AtomicInteger();<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> * Exception handler to pass the disruptor ringbuffer. Same as native implementation only it logs<a name="line.151"></a> -<span class="sourceLineNo">152</span> * using our logger instead of java native logger.<a name="line.152"></a> -<span class="sourceLineNo">153</span> */<a name="line.153"></a> -<span class="sourceLineNo">154</span> static class RingBufferExceptionHandler implements ExceptionHandler<RingBufferTruck> {<a name="line.154"></a> -<span class="sourceLineNo">155</span><a name="line.155"></a> -<span class="sourceLineNo">156</span> @Override<a name="line.156"></a> -<span class="sourceLineNo">157</span> public void handleEventException(Throwable ex, long sequence, RingBufferTruck event) {<a name="line.157"></a> -<span class="sourceLineNo">158</span> LOG.error("Sequence=" + sequence + ", event=" + event, ex);<a name="line.158"></a> -<span class="sourceLineNo">159</span> throw new RuntimeException(ex);<a name="line.159"></a> -<span class="sourceLineNo">160</span> }<a name="line.160"></a> -<span class="sourceLineNo">161</span><a name="line.161"></a> -<span class="sourceLineNo">162</span> @Override<a name="line.162"></a> -<span class="sourceLineNo">163</span> public void handleOnStartException(Throwable ex) {<a name="line.163"></a> -<span class="sourceLineNo">164</span> LOG.error(ex.toString(), ex);<a name="line.164"></a> -<span class="sourceLineNo">165</span> throw new RuntimeException(ex);<a name="line.165"></a> -<span class="sourceLineNo">166</span> }<a name="line.166"></a> -<span class="sourceLineNo">167</span><a name="line.167"></a> -<span class="sourceLineNo">168</span> @Override<a name="line.168"></a> -<span class="sourceLineNo">169</span> public void handleOnShutdownException(Throwable ex) {<a name="line.169"></a> -<span class="sourceLineNo">170</span> LOG.error(ex.toString(), ex);<a name="line.170"></a> -<span class="sourceLineNo">171</span> throw new RuntimeException(ex);<a name="line.171"></a> -<span class="sourceLineNo">172</span> }<a name="line.172"></a> -<span class="sourceLineNo">173</span> }<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> * Constructor.<a name="line.176"></a> -<span class="sourceLineNo">177</span> * @param fs filesystem handle<a name="line.177"></a> -<span class="sourceLineNo">178</span> * @param root path for stored and archived wals<a name="line.178"></a> -<span class="sourceLineNo">179</span> * @param logDir dir where wals are stored<a name="line.179"></a> -<span class="sourceLineNo">180</span> * @param conf configuration to use<a name="line.180"></a> -<span class="sourceLineNo">181</span> */<a name="line.181"></a> -<span class="sourceLineNo">182</span> public FSHLog(final FileSystem fs, final Path root, final String logDir, final Configuration conf)<a name="line.182"></a> -<span class="sourceLineNo">183</span> throws IOException {<a name="line.183"></a> -<span class="sourceLineNo">184</span> this(fs, root, logDir, HConstants.HREGION_OLDLOGDIR_NAME, conf, null, true, null, null);<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> * Create an edit log at the given <code>dir</code> location. You should never have to load an<a name="line.188"></a> -<span class="sourceLineNo">189</span> * existing log. If there is a log at startup, it should have already been processed and deleted<a name="line.189"></a> -<span class="sourceLineNo">190</span> * by the time the WAL object is started up.<a name="line.190"></a> -<span class="sourceLineNo">191</span> * @param fs filesystem handle<a name="line.191"></a> -<span class="sourceLineNo">192</span> * @param rootDir path to where logs and oldlogs<a name="line.192"></a> -<span class="sourceLineNo">193</span> * @param logDir dir where wals are stored<a name="line.193"></a> -<span class="sourceLineNo">194</span> * @param archiveDir dir where wals are archived<a name="line.194"></a> -<span class="sourceLineNo">195</span> * @param conf configuration to use<a name="line.195"></a> -<span class="sourceLineNo">196</span> * @param listeners Listeners on WAL events. Listeners passed here will be registered before we do<a name="line.196"></a> -<span class="sourceLineNo">197</span> * anything else; e.g. the Constructor {@link #rollWriter()}.<a name="line.197"></a> -<span class="sourceLineNo">198</span> * @param failIfWALExists If true IOException will be thrown if files related to this wal already<a name="line.198"></a> -<span class="sourceLineNo">199</span> * exist.<a name="line.199"></a> -<span class="sourceLineNo">200</span> * @param prefix should always be hostname and port in distributed env and it will be URL encoded<a name="line.200"></a> -<span class="sourceLineNo">201</span> * before being used. If prefix is null, "wal" will be used<a name="line.201"></a> -<span class="sourceLineNo">202</span> * @param suffix will be url encoded. null is treated as empty. non-empty must start with<a name="line.202"></a> -<span class="sourceLineNo">203</span> * {@link org.apache.hadoop.hbase.wal.AbstractFSWALProvider#WAL_FILE_NAME_DELIMITER}<a name="line.203"></a> -<span class="sourceLineNo">204</span> */<a name="line.204"></a> -<span class="sourceLineNo">205</span> public FSHLog(final FileSystem fs, final Path rootDir, final String logDir,<a name="line.205"></a> -<span class="sourceLineNo">206</span> final String archiveDir, final Configuration conf, final List<WALActionsListener> listeners,<a name="line.206"></a> -<span class="sourceLineNo">207</span> final boolean failIfWALExists, final String prefix, final String suffix) throws IOException {<a name="line.207"></a> -<span class="sourceLineNo">208</span> super(fs, rootDir, logDir, archiveDir, conf, listeners, failIfWALExists, prefix, suffix);<a name="line.208"></a> -<span class="sourceLineNo">209</span> this.minTolerableReplication = conf.getInt("hbase.regionserver.hlog.tolerable.lowreplication",<a name="line.209"></a> -<span class="sourceLineNo">210</span> FSUtils.getDefaultReplication(fs, this.walDir));<a name="line.210"></a> -<span class="sourceLineNo">211</span> this.lowReplicationRollLimit = conf.getInt("hbase.regionserver.hlog.lowreplication.rolllimit",<a name="line.211"></a> -<span class="sourceLineNo">212</span> 5);<a name="line.212"></a> -<span class="sourceLineNo">213</span> this.closeErrorsTolerated = conf.getInt("hbase.regionserver.logroll.errors.tolerated", 2);<a name="line.213"></a> -<span class="sourceLineNo">214</span><a name="line.214"></a> -<span class="sourceLineNo">215</span> // rollWriter sets this.hdfs_out if it can.<a name="line.215"></a> -<span class="sourceLineNo">216</span> rollWriter();<a name="line.216"></a> +<span class="sourceLineNo">148</span> /** Number of log close errors tolerated before we abort */<a name="line.148"></a> +<span class="sourceLineNo">149</span> private final int closeErrorsTolerated;<a name="line.149"></a> +<span class="sourceLineNo">150</span><a name="line.150"></a> +<span class="sourceLineNo">151</span> private final AtomicInteger closeErrorCount = new AtomicInteger();<a name="line.151"></a> +<span class="sourceLineNo">152</span><a name="line.152"></a> +<span class="sourceLineNo">153</span> /**<a name="line.153"></a> +<span class="sourceLineNo">154</span> * Exception handler to pass the disruptor ringbuffer. Same as native implementation only it logs<a name="line.154"></a> +<span class="sourceLineNo">155</span> * using our logger instead of java native logger.<a name="line.155"></a> +<span class="sourceLineNo">156</span> */<a name="line.156"></a> +<span class="sourceLineNo">157</span> static class RingBufferExceptionHandler implements ExceptionHandler<RingBufferTruck> {<a name="line.157"></a> +<span class="sourceLineNo">158</span><a name="line.158"></a> +<span class="sourceLineNo">159</span> @Override<a name="line.159"></a> +<span class="sourceLineNo">160</span> public void handleEventException(Throwable ex, long sequence, RingBufferTruck event) {<a name="line.160"></a> +<span class="sourceLineNo">161</span> LOG.error("Sequence=" + sequence + ", event=" + event, ex);<a name="line.161"></a> +<span class="sourceLineNo">162</span> throw new RuntimeException(ex);<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> @Override<a name="line.165"></a> +<span class="sourceLineNo">166</span> public void handleOnStartException(Throwable ex) {<a name="line.166"></a> +<span class="sourceLineNo">167</span> LOG.error(ex.toString(), ex);<a name="line.167"></a> +<span class="sourceLineNo">168</span> throw new RuntimeException(ex);<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> @Override<a name="line.171"></a> +<span class="sourceLineNo">172</span> public void handleOnShutdownException(Throwable ex) {<a name="line.172"></a> +<span class="sourceLineNo">173</span> LOG.error(ex.toString(), ex);<a name="line.173"></a> +<span class="sourceLineNo">174</span> throw new RuntimeException(ex);<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><a name="line.177"></a> +<span class="sourceLineNo">178</span> /**<a name="line.178"></a> +<span class="sourceLineNo">179</span> * Constructor.<a name="line.179"></a> +<span class="sourceLineNo">180</span> * @param fs filesystem handle<a name="line.180"></a> +<span class="sourceLineNo">181</span> * @param root path for stored and archived wals<a name="line.181"></a> +<span class="sourceLineNo">182</span> * @param logDir dir where wals are stored<a name="line.182"></a> +<span class="sourceLineNo">183</span> * @param conf configuration to use<a name="line.183"></a> +<span class="sourceLineNo">184</span> */<a name="line.184"></a> +<span class="sourceLineNo">185</span> public FSHLog(final FileSystem fs, final Path root, final String logDir, final Configuration conf)<a name="line.185"></a> +<span class="sourceLineNo">186</span> throws IOException {<a name="line.186"></a> +<span class="sourceLineNo">187</span> this(fs, root, logDir, HConstants.HREGION_OLDLOGDIR_NAME, conf, null, true, null, null);<a name="line.187"></a> +<span class="sourceLineNo">188</span> }<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> * Create an edit log at the given <code>dir</code> location. You should never have to load an<a name="line.191"></a> +<span class="sourceLineNo">192</span> * existing log. If there is a log at startup, it should have already been processed and deleted<a name="line.192"></a> +<span class="sourceLineNo">193</span> * by the time the WAL object is started up.<a name="line.193"></a> +<span class="sourceLineNo">194</span> * @param fs filesystem handle<a name="line.194"></a> +<span class="sourceLineNo">195</span> * @param rootDir path to where logs and oldlogs<a name="line.195"></a> +<span class="sourceLineNo">196</span> * @param logDir dir where wals are stored<a name="line.196"></a> +<span class="sourceLineNo">197</span> * @param archiveDir dir where wals are archived<a name="line.197"></a> +<span class="sourceLineNo">198</span> * @param conf configuration to use<a name="line.198"></a> +<span class="sourceLineNo">199</span> * @param listeners Listeners on WAL events. Listeners passed here will be registered before we do<a name="line.199"></a> +<span class="sourceLineNo">200</span> * anything else; e.g. the Constructor {@link #rollWriter()}.<a name="line.200"></a> +<span class="sourceLineNo">201</span> * @param failIfWALExists If true IOException will be thrown if files related to this wal already<a name="line.201"></a> +<span class="sourceLineNo">202</span> * exist.<a name="line.202"></a> +<span class="sourceLineNo">203</span> * @param prefix should always be hostname and port in distributed env and it will be URL encoded<a name="line.203"></a> +<span class="sourceLineNo">204</span> * before being used. If prefix is null, "wal" will be used<a name="line.204"></a> +<span class="sourceLineNo">205</span> * @param suffix will be url encoded. null is treated as empty. non-empty must start with<a name="line.205"></a> +<span class="sourceLineNo">206</span> * {@link org.apache.hadoop.hbase.wal.AbstractFSWALProvider#WAL_FILE_NAME_DELIMITER}<a name="line.206"></a> +<span class="sourceLineNo">207</span> */<a name="line.207"></a> +<span class="sourceLineNo">208</span> public FSHLog(final FileSystem fs, final Path rootDir, final String logDir,<a name="line.208"></a> +<span class="sourceLineNo">209</span> final String archiveDir, final Configuration conf, final List<WALActionsListener> listeners,<a name="line.209"></a> +<span class="sourceLineNo">210</span> final boolean failIfWALExists, final String prefix, final String suffix) throws IOException {<a name="line.210"></a> +<span class="sourceLineNo">211</span> super(fs, rootDir, logDir, archiveDir, conf, listeners, failIfWALExists, prefix, suffix);<a name="line.211"></a> +<span class="sourceLineNo">212</span> this.minTolerableReplication = conf.getInt("hbase.regionserver.hlog.tolerable.lowreplication",<a name="line.212"></a> +<span class="sourceLineNo">213</span> FSUtils.getDefaultReplication(fs, this.walDir));<a name="line.213"></a> +<span class="sourceLineNo">214</span> this.lowReplicationRollLimit = conf.getInt("hbase.regionserver.hlog.lowreplication.rolllimit",<a name="line.214"></a> +<span class="sourceLineNo">215</span> 5);<a name="line.215"></a> +<span class="sourceLineNo">216</span> this.closeErrorsTolerated = conf.getInt("hbase.regionserver.logroll.errors.tolerated", 2);<a name="line.216"></a> <span class="sourceLineNo">217</span><a name="line.217"></a> -<span class="sourceLineNo">218</span> // This is the 'writer' -- a single threaded executor. This single thread 'consumes' what is<a name="line.218"></a> -<span class="sourceLineNo">219</span> // put on the ring buffer.<a name="line.219"></a> -<span class="sourceLineNo">220</span> String hostingThreadName = Thread.currentThread().getName();<a name="line.220"></a> -<span class="sourceLineNo">221</span> // Using BlockingWaitStrategy. Stuff that is going on here takes so long it makes no sense<a name="line.221"></a> -<span class="sourceLineNo">222</span> // spinning as other strategies do.<a name="line.222"></a> -<span class="sourceLineNo">223</span> this.disruptor = new Disruptor<>(RingBufferTruck::new,<a name="line.223"></a> -<span class="sourceLineNo">224</span> getPreallocatedEventCount(), Threads.getNamedThreadFactory(hostingThreadName + ".append"),<a name="line.224"></a> -<span class="sourceLineNo">225</span> ProducerType.MULTI, new BlockingWaitStrategy());<a name="line.225"></a> -<span class="sourceLineNo">226</span> // Advance the ring buffer sequence so that it starts from 1 instead of 0,<a name="line.226"></a> -<span class="sourceLineNo">227</span> // because SyncFuture.NOT_DONE = 0.<a name="line.227"></a> -<span class="sourceLineNo">228</span> this.disruptor.getRingBuffer().next();<a name="line.228"></a> -<span class="sourceLineNo">229</span> int maxHandlersCount = conf.getInt(HConstants.REGION_SERVER_HANDLER_COUNT, 200);<a name="line.229"></a> -<span class="sourceLineNo">230</span> this.ringBufferEventHandler = new RingBufferEventHandler(<a name="line.230"></a> -<span class="sourceLineNo">231</span> conf.getInt("hbase.regionserver.hlog.syncer.count", 5), maxHandlersCount);<a name="line.231"></a> -<span class="sourceLineNo">232</span> this.disruptor.setDefaultExceptionHandler(new RingBufferExceptionHandler());<a name="line.232"></a> -<span class="sourceLineNo">233</span> this.disruptor.handleEventsWith(new RingBufferEventHandler[] { this.ringBufferEventHandler });<a name="line.233"></a> -<span class="sourceLineNo">234</span> // Starting up threads in constructor is a no no; Interface should have an init call.<a name="line.234"></a> -<span class="sourceLineNo">235</span> this.disruptor.start();<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> /**<a name="line.238"></a> -<span class="sourceLineNo">239</span> * Currently, we need to expose the writer's OutputStream to tests so that they can manipulate the<a name="line.239"></a> -<span class="sourceLineNo">240</span> * default behavior (such as setting the maxRecoveryErrorCount value for example (see<a name="line.240"></a> -<span class="sourceLineNo">241</span> * {@see org.apache.hadoop.hbase.regionserver.wal.AbstractTestWALReplay#testReplayEditsWrittenIntoWAL()}). This is<a name="line.241"></a> -<span class="sourceLineNo">242</span> * done using reflection on the underlying HDFS OutputStream. NOTE: This could be removed once Hadoop1 support is<a name="line.242"></a> -<span class="sourceLineNo">243</span> * removed.<a name="line.243"></a> -<span class="sourceLineNo">244</span> * @return null if underlying stream is not ready.<a name="line.244"></a> -<span class="sourceLineNo">245</span> */<a name="line.245"></a> -<span class="sourceLineNo">246</span> @VisibleForTesting<a name="line.246"></a> -<span class="sourceLineNo">247</span> OutputStream getOutputStream() {<a name="line.247"></a> -<span class="sourceLineNo">248</span> FSDataOutputStream fsdos = this.hdfs_out;<a name="line.248"></a> -<span class="sourceLineNo">249</span> return fsdos != null ? fsdos.getWrappedStream() : null;<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> /**<a name="line.252"></a> -<span class="sourceLineNo">253</span> * Run a sync after opening to set up the pipeline.<a name="line.253"></a> -<span class="sourceLineNo">254</span> */<a name="line.254"></a> -<span class="sourceLineNo">255</span> private void preemptiveSync(final ProtobufLogWriter nextWriter) {<a name="line.255"></a> -<span class="sourceLineNo">256</span> long startTimeNanos = System.nanoTime();<a name="line.256"></a> -<span class="sourceLineNo">257</span> try {<a name="line.257"></a> -<span class="sourceLineNo">258</span> nextWriter.sync();<a name="line.258"></a> -<span class="sourceLineNo">259</span> postSync(System.nanoTime() - startTimeNanos, 0);<a name="line.259"></a> -<span class="sourceLineNo">260</span> } catch (IOException e) {<a name="line.260"></a> -<span class="sourceLineNo">261</span> // optimization failed, no need to abort here.<a name="line.261"></a> -<span class="sourceLineNo">262</span> LOG.warn("pre-sync failed but an optimization so keep going", e);<a name="line.262"></a> -<span class="sourceLineNo">263</span> }<a name="line.263"></a> -<span class="sourceLineNo">264</span> }<a name="line.264"></a> -<span class="sourceLineNo">265</span><a name="line.265"></a> -<span class="sourceLineNo">266</span> /**<a name="line.266"></a> -<span class="sourceLineNo">267</span> * This method allows subclasses to inject different writers without having to extend other<a name="line.267"></a> -<span class="sourceLineNo">268</span> * methods like rollWriter().<a name="line.268"></a> -<span class="sourceLineNo">269</span> * @return Writer instance<a name="line.269"></a> -<span class="sourceLineNo">270</span> */<a name="line.270"></a> -<span class="sourceLineNo">271</span> @Override<a name="line.271"></a> -<span class="sourceLineNo">272</span> protected Writer createWriterInstance(final Path path) throws IOException {<a name="line.272"></a> -<span class="sourceLineNo">273</span> Writer writer = FSHLogProvider.createWriter(conf, fs, path, false);<a name="line.273"></a> -<span class="sourceLineNo">274</span> if (writer instanceof ProtobufLogWriter) {<a name="line.274"></a> -<span class="sourceLineNo">275</span> preemptiveSync((ProtobufLogWriter) writer);<a name="line.275"></a> -<span class="sourceLineNo">276</span> }<a name="line.276"></a> -<span class="sourceLineNo">277</span> return writer;<a name="line.277"></a> -<span class="sourceLineNo">278</span> }<a name="line.278"></a> -<span class="sourceLineNo">279</span><a name="line.279"></a> -<span class="sourceLineNo">280</span> /**<a name="line.280"></a> -<span class="sourceLineNo">281</span> * Used to manufacture race condition reliably. For testing only.<a name="line.281"></a> -<span class="sourceLineNo">282</span> * @see #beforeWaitOnSafePoint()<a name="line.282"></a> -<span class="sourceLineNo">283</span> */<a name="line.283"></a> -<span class="sourceLineNo">284</span> @VisibleForTesting<a name="line.284"></a> -<span class="sourceLineNo">285</span> protected void afterCreatingZigZagLatch() {<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> * @see #afterCreatingZigZagLatch()<a name="line.289"></a> -<span class="sourceLineNo">290</span> */<a name="line.290"></a> -<span class="sourceLineNo">291</span> @VisibleForTesting<a name="line.291"></a> -<span class="sourceLineNo">292</span> protected void beforeWaitOnSafePoint() {<a name="line.292"></a> -<span class="sourceLineNo">293</span> }<a name="line.293"></a> -<span class="sourceLineNo">294</span><a name="line.294"></a> -<span class="sourceLineNo">295</span> @Override<a name="line.295"></a> -<span class="sourceLineNo">296</span> protected void doAppend(Writer writer, FSWALEntry entry) throws IOException {<a name="line.296"></a> -<span class="sourceLineNo">297</span> writer.append(entry);<a name="line.297"></a> +<span class="sourceLineNo">218</span> this.useHsync = conf.getBoolean(HRegion.WAL_HSYNC_CONF_KEY, HRegion.DEFAULT_WAL_HSYNC);<a name="line.218"></a> +<span class="sourceLineNo">219</span><a name="line.219"></a> +<span class="sourceLineNo">220</span> // rollWriter sets this.hdfs_out if it can.<a name="line.220"></a> +<span class="sourceLineNo">221</span> rollWriter();<a name="line.221"></a> +<span class="sourceLineNo">222</span><a name="line.222"></a> +<span class="sourceLineNo">223</span> // This is the 'writer' -- a single threaded executor. This single thread 'consumes' what is<a name="line.223"></a> +<span class="sourceLineNo">224</span> // put on the ring buffer.<a name="line.224"></a> +<span class="sourceLineNo">225</span> String hostingThreadName = Thread.currentThread().getName();<a name="line.225"></a> +<span class="sourceLineNo">226</span> // Using BlockingWaitStrategy. Stuff that is going on here takes so long it makes no sense<a name="line.226"></a> +<span class="sourceLineNo">227</span> // spinning as other strategies do.<a name="line.227"></a> +<span class="sourceLineNo">228</span> this.disruptor = new Disruptor<>(RingBufferTruck::new,<a name="line.228"></a> +<span class="sourceLineNo">229</span> getPreallocatedEventCount(), Threads.getNamedThreadFactory(hostingThreadName + ".append"),<a name="line.229"></a> +<span class="sourceLineNo">230</span> ProducerType.MULTI, new BlockingWaitStrategy());<a name="line.230"></a> +<span class="sourceLineNo">231</span> // Advance the ring buffer sequence so that it starts from 1 instead of 0,<a name="line.231"></a> +<span class="sourceLineNo">232</span> // because SyncFuture.NOT_DONE = 0.<a name="line.232"></a> +<span class="sourceLineNo">233</span> this.disruptor.getRingBuffer().next();<a name="line.233"></a> +<span class="sourceLineNo">234</span> int maxHandlersCount = conf.getInt(HConstants.REGION_SERVER_HANDLER_COUNT, 200);<a name="line.234"></a> +<span class="sourceLineNo">235</span> this.ringBufferEventHandler = new RingBufferEventHandler(<a name="line.235"></a> +<span class="sourceLineNo">236</span> conf.getInt("hbase.regionserver.hlog.syncer.count", 5), maxHandlersCount);<a name="line.236"></a> +<span class="sourceLineNo">237</span> this.disruptor.setDefaultExceptionHandler(new RingBufferExceptionHandler());<a name="line.237"></a> +<span class="sourceLineNo">238</span> this.disruptor.handleEventsWith(new RingBufferEventHandler[] { this.ringBufferEventHandler });<a name="line.238"></a> +<span class="sourceLineNo">239</span> // Starting up threads in constructor is a no no; Interface should have an init call.<a name="line.239"></a> +<span class="sourceLineNo">240</span> this.disruptor.start();<a name="line.240"></a> +<span class="sourceLineNo">241</span> }<a name="line.241"></a> +<span class="sourceLineNo">242</span><a name="line.242"></a> +<span class="sourceLineNo">243</span> /**<a name="line.243"></a> +<span class="sourceLineNo">244</span> * Currently, we need to expose the writer's OutputStream to tests so that they can manipulate the<a name="line.244"></a> +<span class="sourceLineNo">245</span> * default behavior (such as setting the maxRecoveryErrorCount value for example (see<a name="line.245"></a> +<span class="sourceLineNo">246</span> * {@see org.apache.hadoop.hbase.regionserver.wal.AbstractTestWALReplay#testReplayEditsWrittenIntoWAL()}). This is<a name="line.246"></a> +<span class="sourceLineNo">247</span> * done using reflection on the underlying HDFS OutputStream. NOTE: This could be removed once Hadoop1 support is<a name="line.247"></a> +<span class="sourceLineNo">248</span> * removed.<a name="line.248"></a> +<span class="sourceLineNo">249</span> * @return null if underlying stream is not ready.<a name="line.249"></a> +<span class="sourceLineNo">250</span> */<a name="line.250"></a> +<span class="sourceLineNo">251</span> @VisibleForTesting<a name="line.251"></a> +<span class="sourceLineNo">252</span> OutputStream getOutputStream() {<a name="line.252"></a> +<span class="sourceLineNo">253</span> FSDataOutputStream fsdos = this.hdfs_out;<a name="line.253"></a> +<span class="sourceLineNo">254</span> return fsdos != null ? fsdos.getWrappedStream() : null;<a name="line.254"></a> +<span class="sourceLineNo">255</span> }<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> * Run a sync after opening to set up the pipeline.<a name="line.258"></a> +<span class="sourceLineNo">259</span> */<a name="line.259"></a> +<span class="sourceLineNo">260</span> private void preemptiveSync(final ProtobufLogWriter nextWriter) {<a name="line.260"></a> +<span class="sourceLineNo">261</span> long startTimeNanos = System.nanoTime();<a name="line.261"></a> +<span class="sourceLineNo">262</span> try {<a name="line.262"></a> +<span class="sourceLineNo">263</span> nextWriter.sync(useHsync);<a name="line.263"></a> +<span class="sourceLineNo">264</span> postSync(System.nanoTime() - startTimeNanos, 0);<a name="line.264"></a> +<span class="sourceLineNo">265</span> } catch (IOException e) {<a name="line.265"></a> +<span class="sourceLineNo">266</span> // optimization failed, no need to abort here.<a name="line.266"></a> +<span class="sourceLineNo">267</span> LOG.warn("pre-sync failed but an optimization so keep going", e);<a name="line.267"></a> +<span class="sourceLineNo">268</span> }<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> /**<a name="line.271"></a> +<span class="sourceLineNo">272</span> * This method allows subclasses to inject different writers without having to extend other<a name="line.272"></a> +<span class="sourceLineNo">273</span> * methods like rollWriter().<a name="line.273"></a> +<span class="sourceLineNo">274</span> * @return Writer instance<a name="line.274"></a> +<span class="sourceLineNo">275</span> */<a name="line.275"></a> +<span class="sourceLineNo">276</span> @Override<a name="line.276"></a> +<span class="sourceLineNo">277</span> protected Writer createWriterInstance(final Path path) throws IOException {<a name="line.277"></a> +<span class="sourceLineNo">278</span> Writer writer = FSHLogProvider.createWriter(conf, fs, path, false);<a name="line.278"></a> +<span class="sourceLineNo">279</span> if (writer instanceof ProtobufLogWriter) {<a name="line.279"></a> +<span class="sourceLineNo">280</span> preemptiveSync((ProtobufLogWriter) writer);<a name="line.280"></a> +<span class="sourceLineNo">281</span> }<a name="line.281"></a> +<span class="sourceLineNo">282</span> return writer;<a name="line.282"></a> +<span class="sourceLineNo">283</span> }<a name="line.283"></a> +<span class="sourceLineNo">284</span><a name="line.284"></a> +<span class="sourceLineNo">285</span> /**<a name="line.285"></a> +<span class="sourceLineNo">286</span> * Used to manufacture race condition reliably. For testing only.<a name="line.286"></a> +<span class="sourceLineNo">287</span> * @see #beforeWaitOnSafePoint()<a name="line.287"></a> +<span class="sourceLineNo">288</span> */<a name="line.288"></a> +<span class="sourceLineNo">289</span> @VisibleForTesting<a name="line.289"></a> +<span class="sourceLineNo">290</span> protected void afterCreatingZigZagLatch() {<a name="line.290"></a> +<span class="sourceLineNo">291</span> }<a name="line.291"></a> +<span class="sourceLineNo">292</span><a name="line.292"></a> +<span class="sourceLineNo">293</span> /**<a name="line.293"></a> +<span class="sourceLineNo">294</span> * @see #afterCreatingZigZagLatch()<a name="line.294"></a> +<span class="sourceLineNo">295</span> */<a name="line.295"></a> +<span class="sourceLineNo">296</span> @VisibleForTesting<a name="line.296"></a> +<span class="sourceLineNo">297</span> protected void beforeWaitOnSafePoint() {<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> @Override<a name="line.300"></a> -<span class="sourceLineNo">301</span> protected void doReplaceWriter(Path oldPath, Path newPath, Writer nextWriter) throws IOException {<a name="line.301"></a> -<span class="sourceLineNo">302</span> // Ask the ring buffer writer to pause at a safe point. Once we do this, the writer<a name="line.302"></a> -<span class="sourceLineNo">303</span> // thread will eventually pause. An error hereafter needs to release the writer thread<a name="line.303"></a> -<span class="sourceLineNo">304</span> // regardless -- hence the finally block below. Note, this method is called from the FSHLog<a name="line.304"></a> -<span class="sourceLineNo">305</span> // constructor BEFORE the ring buffer is set running so it is null on first time through<a name="line.305"></a> -<span class="sourceLineNo">306</span> // here; allow for that.<a name="line.306"></a> -<span class="sourceLineNo">307</span> SyncFuture syncFuture = null;<a name="line.307"></a> -<span class="sourceLineNo">308</span> SafePointZigZagLatch zigzagLatch = null;<a name="line.308"></a> -<span class="sourceLineNo">309</span> long sequence = -1L;<a name="line.309"></a> -<span class="sourceLineNo">310</span> if (this.ringBufferEventHandler != null) {<a name="line.310"></a> -<span class="sourceLineNo">311</span> // Get sequence first to avoid dead lock when ring buffer is full<a name="line.311"></a> -<span class="sourceLineNo">312</span> // Considering below sequence<a name="line.312"></a> -<span class="sourceLineNo">313</span> // 1. replaceWriter is called and zigzagLatch is initialized<a name="line.313"></a> -<span class="sourceLineNo">314</span> // 2. ringBufferEventHandler#onEvent is called and arrives at #attainSafePoint(long) then wait<a name="line.314"></a> -<span class="sourceLineNo">315</span> // on safePointReleasedLatch<a name="line.315"></a> -<span class="sourceLineNo">316</span> // 3. Since ring buffer is full, if we get sequence when publish sync, the replaceWriter<a name="line.316"></a> -<span class="sourceLineNo">317</span> // thread will wait for the ring buffer to be consumed, but the only consumer is waiting<a name="line.317"></a> -<span class="sourceLineNo">318</span> // replaceWriter thread to release safePointReleasedLatch, which causes a deadlock<a name="line.318"></a> -<span class="sourceLineNo">319</span> sequence = getSequenceOnRingBuffer();<a name="line.319"></a> -<span class="sourceLineNo">320</span> zigzagLatch = this.ringBufferEventHandler.attainSafePoint();<a name="line.320"></a> -<span class="sourceLineNo">321</span> }<a name="line.321"></a> -<span class="sourceLineNo">322</span> afterCreatingZigZagLatch();<a name="line.322"></a> -<span class="sourceLineNo">323</span> try {<a name="line.323"></a> -<span class="sourceLineNo">324</span> // Wait on the safe point to be achieved. Send in a sync in case nothing has hit the<a name="line.324"></a> -<span class="sourceLineNo">325</span> // ring buffer between the above notification of writer that we want it to go to<a name="line.325"></a> -<span class="sourceLineNo">326</span> // 'safe point' and then here where we are waiting on it to attain safe point. Use<a name="line.326"></a> -<span class="sourceLineNo">327</span> // 'sendSync' instead of 'sync' because we do not want this thread to block waiting on it<a name="line.327"></a> -<span class="sourceLineNo">328</span> // to come back. Cleanup this syncFuture down below after we are ready to run again.<a name="line.328"></a> -<span class="sourceLineNo">329</span> try {<a name="line.329"></a> -<span class="sourceLineNo">330</span> if (zigzagLatch != null) {<a name="line.330"></a> -<span class="sourceLineNo">331</span> // use assert to make sure no change breaks the logic that<a name="line.331"></a> -<span class="sourceLineNo">332</span> // sequence and zigzagLatch will be set together<a name="line.332"></a> -<span class="sourceLineNo">333</span> assert sequence > 0L : "Failed to get sequence from ring buffer";<a name="line.333"></a> -<span class="sourceLineNo">334</span> TraceUtil.addTimelineAnnotation("awaiting safepoint");<a name="line.334"></a> -<span class="sourceLineNo">335</span> syncFuture = zigzagLatch.waitSafePoint(publishSyncOnRingBuffer(sequence));<a name="line.335"></a> -<span class="sourceLineNo">336</span> }<a name="line.336"></a> -<span class="sourceLineNo">337</span> } catch (FailedSyncBeforeLogCloseException e) {<a name="line.337"></a> -<span class="sourceLineNo">338</span> // If unflushed/unsynced entries on close, it is reason to abort.<a name="line.338"></a> -<span class="sourceLineNo">339</span> if (isUnflushedEntries()) {<a name="line.339"></a> -<span class="sourceLineNo">340</span> throw e;<a name="line.340"></a> +<span class="sourceLineNo">301</span> protected void doAppend(Writer writer, FSWALEntry entry) throws IOException {<a name="line.301"></a> +<span class="sourceLineNo">302</span> writer.append(entry);<a name="line.302"></a> +<span class="sourceLineNo">303</span> }<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> protected void doReplaceWriter(Path oldPath, Path newPath, Writer nextWriter) throws IOException {<a name="line.306"></a> +<span class="sourceLineNo">307</span> // Ask the ring buffer writer to pause at a safe point. Once we do this, the writer<a name="line.307"></a> +<span class="sourceLineNo">308</span> // thread will eventually pause. An error hereafter needs to release the writer thread<a name="line.308"></a> +<span class="sourceLineNo">309</span> // regardless -- hence the finally block below. Note, this method is called from the FSHLog<a name="line.309"></a> +<span class="sourceLineNo">310</span> // constructor BEFORE the ring buffer is set running so it is null on first time through<a name="line.310"></a> +<span class="sourceLineNo">311</span> // here; allow for that.<a name="line.311"></a> +<span class="sourceLineNo">312</span> SyncFuture syncFuture = null;<a name="line.312"></a> +<span class="sourceLineNo">313</span> SafePointZigZagLatch zigzagLatch = null;<a name="line.313"></a> +<span class="sourceLineNo">314</span> long sequence = -1L;<a name="line.314"></a> +<span class="sourceLineNo">315</span> if (this.ringBufferEventHandler != null) {<a name="line.315"></a> +<span class="sourceLineNo">316</span> // Get sequence first to avoid dead lock when ring buffer is full<a name="line.316"></a> +<span class="sourceLineNo">317</span> // Considering below sequence<a name="line.317"></a> +<span class="sourceLineNo">318</span> // 1. replaceWriter is called and zigzagLatch is initialized<a name="line.318"></a> +<span class="sourceLineNo">319</span> // 2. ringBufferEventHandler#onEvent is called and arrives at #attainSafePoint(long) then wait<a name="line.319"></a> +<span class="sourceLineNo">320</span> // on safePointReleasedLatch<a name="line.320"></a> +<span class="sourceLineNo">321</span> // 3. Since ring buffer is full, if we get sequence when publish sync, the replaceWriter<a name="line.321"></a> +<span class="sourceLineNo">322</span> // thread will wait for the ring buffer to be consumed, but the only consumer is waiting<a name="line.322"></a> +<span class="sourceLineNo">323</span> // replaceWriter thread to release safePointReleasedLatch, which causes a deadlock<a name="line.323"></a> +<span class="sourceLineNo">324</span> sequence = getSequenceOnRingBuffer();<a name="line.324"></a> +<span class="sourceLineNo">325</span> zigzagLatch = this.ringBufferEventHandler.attainSafePoint();<a name="line.325"></a> +<span class="sourceLineNo">326</span> }<a name="line.326"></a> +<span class="sourceLineNo">327</span> afterCreatingZigZagLatch();<a name="line.327"></a> +<span class="sourceLineNo">328</span> try {<a name="line.328"></a> +<span class="sourceLineNo">329</span> // Wait on the safe point to be achieved. Send in a sync in case nothing has hit the<a name="line.329"></a> +<span class="sourceLineNo">330</span> // ring buffer between the above notification of writer that we want it to go to<a name="line.330"></a> +<span class="sourceLineNo">331</span> // 'safe point' and then here where we are waiting on it to attain safe point. Use<a name="line.331"></a> +<span class="sourceLineNo">332</span> // 'sendSync' instead of 'sync' because we do not want this thread to block waiting on it<a name="line.332"></a> +<span class="sourceLineNo">333</span> // to come back. Cleanup this syncFuture down below after we are ready to run again.<a name="line.333"></a> +<span class="sourceLineNo">334</span> try {<a name="line.334"></a> +<span class="sourceLineNo">335</span> if (zigzagLatch != null) {<a name="line.335"></a> +<span class="sourceLineNo">336</span> // use assert to make sure no change breaks the logic that<a name="line.336"></a> +<span class="sourceLineNo">337</span> // sequence and zigzagLatch will be set together<a name="line.337"></a> +<span class="sourceLineNo">338</span> assert sequence > 0L : "Failed to get sequence from ring buffer";<a name="line.338"></a> +<span class="sourceLineNo">339</span> TraceUtil.addTimelineAnnotation("awaiting safepoint");<a name="line.339"></a> +<span class="sourceLineNo">340</span> syncFuture = zigzagLatch.waitSafePoint(publishSyncOnRingBuffer(sequence, false));<a name="line.340"></a> <span class="sourceLineNo">341</span> }<a name="line.341"></a> -<span class="sourceLineNo">342</span> LOG.warn(<a name="line.342"></a> -<span class="sourceLineNo">343</span> "Failed sync-before-close but no outstanding appends; closing WAL" + e.getMessage());<a name="line.343"></a> -<span class="sourceLineNo">344</span> }<a name="line.344"></a> -<span class="sourceLineNo">345</span> long oldFileLen = 0L;<a name="line.345"></a> -<span class="sourceLineNo">346</span> // It is at the safe point. Swap out writer from under the blocked writer thread.<a name="line.346"></a> -<span class="sourceLineNo">347</span> // TODO: This is close is inline with critical section. Should happen in background?<a name="line.347"></a> -<span class="sourceLineNo">348</span> if (this.writer != null) {<a name="line.348"></a> -<span class="sourceLineNo">349</span> oldFileLen = this.writer.getLength();<a name="line.349"></a> -<span class="sourceLineNo">350</span> try {<a name="line.350"></a> -<span class="sourceLineNo">351</span> TraceUtil.addTimelineAnnotation("closing writer");<a name="line.351"></a> -<span class="sourceLineNo">352</span> this.writer.close();<a name="line.352"></a> -<span class="sourceLineNo">353</span> TraceUtil.addTimelineAnnotation("writer closed");<a name="line.353"></a> -<span class="sourceLineNo">354</span> this.closeErrorCount.set(0);<a name="line.354"></a> -<span class="sourceLineNo">355</span> } catch (IOException ioe) {<a name="line.355"></a> -<span class="sourceLineNo">356</span> int errors = closeErrorCount.incrementAndGet();<a name="line.356"></a> -<span class="sourceLineNo">357</span> if (!isUnflushedEntries() && (errors <= this.closeErrorsTolerated)) {<a name="line.357"></a> -<span class="sourceLineNo">358</span> LOG.warn("Riding over failed WAL close of " + oldPath + ", cause=\"" + ioe.getMessage()<a name="line.358"></a> -<span class="sourceLineNo">359</span> + "\", errors=" + errors<a name="line.359"></a> -<span class="sourceLineNo">360</span> + "; THIS FILE WAS NOT CLOSED BUT ALL EDITS SYNCED SO SHOULD BE OK");<a name="line.360"></a> -<span class="sourceLineNo">361</span> } else {<a name="line.361"></a> -<span class="sourceLineNo">362</span> throw ioe;<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> }<a name="line.365"></a> -<span class="sourceLineNo">366</span> logRollAndSetupWalProps(oldPath, newPath, oldFileLen);<a name="line.366"></a> -<span class="sourceLineNo">367</span> this.writer = nextWriter;<a name="line.367"></a> -<span class="sourceLineNo">368</span> if (nextWriter != null && nextWriter instanceof ProtobufLogWriter) {<a name="line.368"></a> -<span class="sourceLineNo">369</span> this.hdfs_out = ((ProtobufLogWriter) nextWriter).getStream();<a name="line.369"></a> -<span class="sourceLineNo">370</span> } else {<a name="line.370"></a> -<span class="sourceLineNo">371</span> this.hdfs_out = null;<a name="line.371"></a> -<span class="sourceLineNo">372</span> }<a name="line.372"></a> -<span class="sourceLineNo">373</span> } catch (InterruptedException ie) {<a name="line.373"></a> -<span class="sourceLineNo">374</span> // Perpetuate the interrupt<a name="line.374"></a> -<span class="sourceLineNo">375</span> Thread.currentThread().interrupt();<a name="line.375"></a> -<span class="sourceLineNo">376</span> } catch (IOException e) {<a name="line.376"></a> -<span class="sourceLineNo">377</span> long count = getUnflushedEntriesCount();<a name="line.377"></a> -<span class="sourceLineNo">378</span> LOG.error("Failed close of WAL writer " + oldPath + ", unflushedEntries=" + count, e);<a name="line.378"></a> -<span class="sourceLineNo">379</span> throw new FailedLogCloseException(oldPath + ", unflushedEntries=" + count, e);<a name="line.379"></a> -<span class="sourceLineNo">380</span> } finally {<a name="line.380"></a> -<span class="sourceLineNo">381</span> // Let the writer thread go regardless, whether error or not.<a name="line.381"></a> -<span class="sourceLineNo">382</span> if (zigzagLatch != null) {<a name="line.382"></a> -<span class="sourceLineNo">383</span> zigzagLatch.releaseSafePoint();<a name="line.383"></a> -<span class="sourceLineNo">384</span> // syncFuture will be null if we failed our wait on safe point above. 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<TRUNCATED>