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<h2 title="Class SplitWALManager" class="title">Class SplitWALManager</h2>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.72">SplitWALManager</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></pre>
<div class="block">Create <a href="../../../../../org/apache/hadoop/hbase/master/procedure/SplitWALProcedure.html" title="class in org.apache.hadoop.hbase.master.procedure"><code>SplitWALProcedure</code></a> for each WAL which need to split. Manage the workers for each
<a href="../../../../../org/apache/hadoop/hbase/master/procedure/SplitWALProcedure.html" title="class in org.apache.hadoop.hbase.master.procedure"><code>SplitWALProcedure</code></a>.
Total number of workers is (number of online servers) * (HBASE_SPLIT_WAL_MAX_SPLITTER).
Helps assign and release workers for split tasks.
Provide helper method to delete split WAL file and directory.
The user can get the SplitWALProcedures via splitWALs(crashedServer, splitMeta)
can get the files that need to split via getWALsToSplit(crashedServer, splitMeta)
can delete the splitting WAL and directory via deleteSplitWAL(wal)
and deleteSplitWAL(crashedServer)
can check if splitting WALs of a crashed server is success via isSplitWALFinished(walPath)
can acquire and release a worker for splitting WAL via acquireSplitWALWorker(procedure)
and releaseSplitWALWorker(worker, scheduler)
This class is to replace the zk-based WAL splitting related code, <a href="../../../../../org/apache/hadoop/hbase/master/MasterWalManager.html" title="class in org.apache.hadoop.hbase.master"><code>MasterWalManager</code></a>,
<a href="../../../../../org/apache/hadoop/hbase/master/SplitLogManager.html" title="class in org.apache.hadoop.hbase.master"><code>SplitLogManager</code></a>, <a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKSplitLog.html" title="class in org.apache.hadoop.hbase.zookeeper"><code>ZKSplitLog</code></a> and
<a href="../../../../../org/apache/hadoop/hbase/coordination/ZKSplitLogManagerCoordination.html" title="class in org.apache.hadoop.hbase.coordination"><code>ZKSplitLogManagerCoordination</code></a> can be removed
after we switch to procedure-based WAL splitting.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/master/SplitLogManager.html" title="class in org.apache.hadoop.hbase.master"><code>for the original distributed split WAL manager.</code></a></dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<td class="colFirst"><code>private static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.SplitWorkerAssigner.html" title="class in org.apache.hadoop.hbase.master">SplitWALManager.SplitWorkerAssigner</a></span></code>
<div class="block">help assign and release a worker for each WAL splitting task
For each worker, concurrent running splitting task should be no more than maxSplitTasks
If a task failed to acquire a worker, it will suspend and wait for workers available</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>private org.apache.hadoop.conf.Configuration</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#conf">conf</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private org.apache.hadoop.fs.FileSystem</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#fs">fs</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#LOG">LOG</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/master/MasterServices.html" title="interface in org.apache.hadoop.hbase.master">MasterServices</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#master">master</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private org.apache.hadoop.fs.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#rootDir">rootDir</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.SplitWorkerAssigner.html" title="class in org.apache.hadoop.hbase.master">SplitWALManager.SplitWorkerAssigner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#splitWorkerAssigner">splitWorkerAssigner</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private org.apache.hadoop.fs.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#walArchiveDir">walArchiveDir</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#SplitWALManager-org.apache.hadoop.hbase.master.MasterServices-">SplitWALManager</a></span>(<a href="../../../../../org/apache/hadoop/hbase/master/MasterServices.html" title="interface in org.apache.hadoop.hbase.master">MasterServices</a>&nbsp;master)</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#acquireSplitWALWorker-org.apache.hadoop.hbase.procedure2.Procedure-">acquireSplitWALWorker</a></span>(<a href="../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;procedure)</code>
<div class="block">Acquire a split WAL worker</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#addUsedSplitWALWorker-org.apache.hadoop.hbase.ServerName-">addUsedSplitWALWorker</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;worker)</code>
<div class="block">When master restart, there will be a new splitWorkerAssigner.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#archive-java.lang.String-">archive</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;wal)</code>
<div class="block">Archive processed WAL</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#createSplitWALProcedures-java.util.List-org.apache.hadoop.hbase.ServerName-">createSplitWALProcedures</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.hadoop.fs.FileStatus&gt;&nbsp;splittingWALs,
<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;crashedServer)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#deleteWALDir-org.apache.hadoop.hbase.ServerName-">deleteWALDir</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>&nbsp;</td>
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<td class="colFirst"><code>private org.apache.hadoop.fs.Path</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#getWALSplitDir-org.apache.hadoop.hbase.ServerName-">getWALSplitDir</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>&nbsp;</td>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.hadoop.fs.FileStatus&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#getWALsToSplit-org.apache.hadoop.hbase.ServerName-boolean-">getWALsToSplit</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
boolean&nbsp;splitMeta)</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#isSplitWALFinished-java.lang.String-">isSplitWALFinished</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;walPath)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#releaseSplitWALWorker-org.apache.hadoop.hbase.ServerName-org.apache.hadoop.hbase.master.procedure.MasterProcedureScheduler-">releaseSplitWALWorker</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;worker,
<a href="../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureScheduler.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureScheduler</a>&nbsp;scheduler)</code>
<div class="block">After the worker finished the split WAL task, it will release the worker, and wake up all the
suspend procedures in the ProcedureEvent</div>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.html#splitWALs-org.apache.hadoop.hbase.ServerName-boolean-">splitWALs</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;crashedServer,
boolean&nbsp;splitMeta)</code>&nbsp;</td>
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<pre>private static final&nbsp;org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.73">LOG</a></pre>
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<pre>private final&nbsp;<a href="../../../../../org/apache/hadoop/hbase/master/SplitWALManager.SplitWorkerAssigner.html" title="class in org.apache.hadoop.hbase.master">SplitWALManager.SplitWorkerAssigner</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.76">splitWorkerAssigner</a></pre>
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<pre>private final&nbsp;org.apache.hadoop.fs.Path <a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.77">rootDir</a></pre>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.82">SplitWALManager</a>(<a href="../../../../../org/apache/hadoop/hbase/master/MasterServices.html" title="interface in org.apache.hadoop.hbase.master">MasterServices</a>&nbsp;master)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>splitWALs</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.92">splitWALs</a>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;crashedServer,
boolean&nbsp;splitMeta)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getWALsToSplit</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.hadoop.fs.FileStatus&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.105">getWALsToSplit</a>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
boolean&nbsp;splitMeta)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>private&nbsp;org.apache.hadoop.fs.Path&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.114">getWALSplitDir</a>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.123">archive</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;wal)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Archive processed WAL</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.127">deleteWALDir</a>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.141">isSplitWALFinished</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;walPath)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.145">createSplitWALProcedures</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.hadoop.fs.FileStatus&gt;&nbsp;splittingWALs,
<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;crashedServer)</pre>
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<pre>public&nbsp;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.159">acquireSplitWALWorker</a>(<a href="../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;procedure)
throws <a href="../../../../../org/apache/hadoop/hbase/procedure2/ProcedureSuspendedException.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureSuspendedException</a></pre>
<div class="block">Acquire a split WAL worker</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>procedure</code> - split WAL task</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an available region server which could execute this task</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/procedure2/ProcedureSuspendedException.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureSuspendedException</a></code> - if there is no available worker,
it will throw this exception to WAIT the procedure.</dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.176">releaseSplitWALWorker</a>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;worker,
<a href="../../../../../org/apache/hadoop/hbase/master/procedure/MasterProcedureScheduler.html" title="class in org.apache.hadoop.hbase.master.procedure">MasterProcedureScheduler</a>&nbsp;scheduler)</pre>
<div class="block">After the worker finished the split WAL task, it will release the worker, and wake up all the
suspend procedures in the ProcedureEvent</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>worker</code> - worker which is about to release</dd>
<dd><code>scheduler</code> - scheduler which is to wake up the procedure event</dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/SplitWALManager.html#line.189">addUsedSplitWALWorker</a>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;worker)</pre>
<div class="block">When master restart, there will be a new splitWorkerAssigner. But if there are splitting WAL
tasks running on the region server side, they will not be count by the new splitWorkerAssigner.
Thus we should add the workers of running tasks to the assigner when we load the procedures
from MasterProcWALs.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>worker</code> - region server which is executing a split WAL task</dd>
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