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| <div class="subTitle">org.apache.hadoop.hbase.regionserver.wal</div> |
| <h2 title="Class FSHLog.RingBufferEventHandler" class="title">Class FSHLog.RingBufferEventHandler</h2> |
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| <li>org.apache.hadoop.hbase.regionserver.wal.FSHLog.RingBufferEventHandler</li> |
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| <div class="description"> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd>com.lmax.disruptor.EventHandler<<a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/RingBufferTruck.html" title="class in org.apache.hadoop.hbase.regionserver.wal">RingBufferTruck</a>>, com.lmax.disruptor.LifecycleAware</dd> |
| </dl> |
| <dl> |
| <dt>Enclosing class:</dt> |
| <dd><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSHLog</a></dd> |
| </dl> |
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| <br> |
| <pre>class <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.html#line.953">FSHLog.RingBufferEventHandler</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements com.lmax.disruptor.EventHandler<<a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/RingBufferTruck.html" title="class in org.apache.hadoop.hbase.regionserver.wal">RingBufferTruck</a>>, com.lmax.disruptor.LifecycleAware</pre> |
| <div class="block">Handler that is run by the disruptor ringbuffer consumer. Consumer is a SINGLE |
| 'writer/appender' thread. Appends edits and starts up sync runs. Tries its best to batch up |
| syncs. There is no discernible benefit batching appends so we just append as they come in |
| because it simplifies the below implementation. See metrics for batching effectiveness (In |
| measurement, at 100 concurrent handlers writing 1k, we are batching > 10 appends and 10 handler |
| sync invocations for every actual dfsclient sync call; at 10 concurrent handlers, YMMV). |
| <p> |
| Herein, we have an array into which we store the sync futures as they come in. When we have a |
| 'batch', we'll then pass what we have collected to a SyncRunner thread to do the filesystem |
| sync. When it completes, it will then call <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#done-long-java.lang.Throwable-"><code>SyncFuture.done(long, Throwable)</code></a> on each of |
| SyncFutures in the batch to release blocked Handler threads. |
| <p> |
| I've tried various effects to try and make latencies low while keeping throughput high. I've |
| tried keeping a single Queue of SyncFutures in this class appending to its tail as the syncs |
| coming and having sync runner threads poll off the head to 'finish' completed SyncFutures. I've |
| tried linkedlist, and various from concurrent utils whether LinkedBlockingQueue or |
| ArrayBlockingQueue, etc. The more points of synchronization, the more 'work' (according to |
| 'perf stats') that has to be done; small increases in stall percentages seem to have a big |
| impact on throughput/latencies. The below model where we have an array into which we stash the |
| syncs and then hand them off to the sync thread seemed like a decent compromise. See HBASE-8755 |
| for more detail.</div> |
| </li> |
| </ul> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#exception">exception</a></span></code> |
| <div class="block">Set if we get an exception appending or syncing so that all subsequence appends and syncs on |
| this WAL fail until WAL is replaced.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#safePointWaiter">safePointWaiter</a></span></code> |
| <div class="block">Object to block on while waiting on safe point.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#shutdown">shutdown</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html" title="class in org.apache.hadoop.hbase.regionserver.wal">SyncFuture</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#syncFutures">syncFutures</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicInteger</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#syncFuturesCount">syncFuturesCount</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#syncRunnerIndex">syncRunnerIndex</a></span></code> |
| <div class="block">Which syncrunner to use next.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.SyncRunner.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSHLog.SyncRunner</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#syncRunners">syncRunners</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSHLog.SafePointZigZagLatch</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#zigzagLatch">zigzagLatch</a></span></code> </td> |
| </tr> |
| </table> |
| </li> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#RingBufferEventHandler-int-int-">RingBufferEventHandler</a></span>(int syncRunnerCount, |
| int maxBatchCount)</code> </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#append-org.apache.hadoop.hbase.regionserver.wal.FSWALEntry-">append</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSWALEntry.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSWALEntry</a> entry)</code> |
| <div class="block">Append to the WAL.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSHLog.SafePointZigZagLatch</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#attainSafePoint--">attainSafePoint</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#attainSafePoint-long-">attainSafePoint</a></span>(long currentSequence)</code> |
| <div class="block">Check if we should attain safe point.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#cleanupOutstandingSyncsOnException-long-java.lang.Exception-">cleanupOutstandingSyncsOnException</a></span>(long sequence, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a> e)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#isOutstandingSyncs--">isOutstandingSyncs</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#isOutstandingSyncsFromRunners--">isOutstandingSyncsFromRunners</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#offerDoneSyncsBackToCache--">offerDoneSyncsBackToCache</a></span>()</code> |
| <div class="block">Offers the finished syncs back to the cache for reuse.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#onEvent-org.apache.hadoop.hbase.regionserver.wal.RingBufferTruck-long-boolean-">onEvent</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/RingBufferTruck.html" title="class in org.apache.hadoop.hbase.regionserver.wal">RingBufferTruck</a> truck, |
| long sequence, |
| boolean endOfBatch)</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#onShutdown--">onShutdown</a></span>()</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#onStart--">onStart</a></span>()</code> </td> |
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| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="syncRunners"> |
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| </a> |
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| <h4>syncRunners</h4> |
| <pre>private final <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.SyncRunner.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSHLog.SyncRunner</a>[] <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.954">syncRunners</a></pre> |
| </li> |
| </ul> |
| <a name="syncFutures"> |
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| <h4>syncFutures</h4> |
| <pre>private final <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html" title="class in org.apache.hadoop.hbase.regionserver.wal">SyncFuture</a>[] <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.955">syncFutures</a></pre> |
| </li> |
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| <a name="syncFuturesCount"> |
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| </a> |
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| <h4>syncFuturesCount</h4> |
| <pre>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicInteger</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.958">syncFuturesCount</a></pre> |
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| <h4>zigzagLatch</h4> |
| <pre>private volatile <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSHLog.SafePointZigZagLatch</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.959">zigzagLatch</a></pre> |
| </li> |
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| <a name="exception"> |
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| </a> |
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| <li class="blockList"> |
| <h4>exception</h4> |
| <pre>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.964">exception</a></pre> |
| <div class="block">Set if we get an exception appending or syncing so that all subsequence appends and syncs on |
| this WAL fail until WAL is replaced.</div> |
| </li> |
| </ul> |
| <a name="safePointWaiter"> |
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| </a> |
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| <h4>safePointWaiter</h4> |
| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.968">safePointWaiter</a></pre> |
| <div class="block">Object to block on while waiting on safe point.</div> |
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| <h4>shutdown</h4> |
| <pre>private volatile boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.969">shutdown</a></pre> |
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| <pre>private int <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.974">syncRunnerIndex</a></pre> |
| <div class="block">Which syncrunner to use next.</div> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <h4>RingBufferEventHandler</h4> |
| <pre><a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.976">RingBufferEventHandler</a>(int syncRunnerCount, |
| int maxBatchCount)</pre> |
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| <h4>cleanupOutstandingSyncsOnException</h4> |
| <pre>private void <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.984">cleanupOutstandingSyncsOnException</a>(long sequence, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a> e)</pre> |
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| <pre>private void <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.995">offerDoneSyncsBackToCache</a>()</pre> |
| <div class="block">Offers the finished syncs back to the cache for reuse.</div> |
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| <pre>private boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.1005">isOutstandingSyncs</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>True if outstanding sync futures still</dd> |
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| <pre>private boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.1016">isOutstandingSyncsFromRunners</a>()</pre> |
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| <h4>onEvent</h4> |
| <pre>public void <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.1028">onEvent</a>(<a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/RingBufferTruck.html" title="class in org.apache.hadoop.hbase.regionserver.wal">RingBufferTruck</a> truck, |
| long sequence, |
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| <dd><code>onEvent</code> in interface <code>com.lmax.disruptor.EventHandler<<a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/RingBufferTruck.html" title="class in org.apache.hadoop.hbase.regionserver.wal">RingBufferTruck</a>></code></dd> |
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| <pre><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSHLog.SafePointZigZagLatch.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSHLog.SafePointZigZagLatch</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.1120">attainSafePoint</a>()</pre> |
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| <h4>attainSafePoint</h4> |
| <pre>private void <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.1129">attainSafePoint</a>(long currentSequence)</pre> |
| <div class="block">Check if we should attain safe point. If so, go there and then wait till signalled before we |
| proceeding.</div> |
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| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.1164">append</a>(<a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/FSWALEntry.html" title="class in org.apache.hadoop.hbase.regionserver.wal">FSWALEntry</a> entry) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre> |
| <div class="block">Append to the WAL. Does all CP and WAL listener calls.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd> |
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| <pre>public void <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/FSHLog.RingBufferEventHandler.html#line.1177">onStart</a>()</pre> |
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| <dd><code>onStart</code> in interface <code>com.lmax.disruptor.LifecycleAware</code></dd> |
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| <dd><code>onShutdown</code> in interface <code>com.lmax.disruptor.LifecycleAware</code></dd> |
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