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| <div class="subTitle">org.apache.hadoop.hbase.master.assignment</div> |
| <h2 title="Class RegionStateNodeLock" class="title">Class RegionStateNodeLock</h2> |
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| <li>org.apache.hadoop.hbase.master.assignment.RegionStateNodeLock</li> |
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| <pre>@InterfaceAudience.Private |
| class <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.46">RegionStateNodeLock</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">A lock implementation which supports unlock by another thread. |
| <p> |
| This is because we need to hold region state node lock while updating region state to meta(for |
| keeping consistency), so it is better to yield the procedure to release the procedure worker. But |
| after waking up the procedure, we may use another procedure worker to execute the procedure, |
| which means we need to unlock by another thread. |
| <p> |
| For locking by procedure, we will also suspend the procedure if the lock is not ready, and |
| schedule it again when lock is ready. This is very important to not block the PEWorker as we may |
| hold the lock when updating meta, which could take a lot of time. |
| <p> |
| Please see HBASE-28196 for more details.</div> |
| </li> |
| </ul> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.QueueEntry.html" title="interface in org.apache.hadoop.hbase.master.assignment">RegionStateNodeLock.QueueEntry</a></span></code> |
| <div class="block">This is for abstraction the common lock/unlock logic for both Thread and Procedure.</div> |
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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 int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#count">count</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html?is-external=true" title="class or interface in java.util.concurrent.locks">Lock</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#lock">lock</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <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/master/assignment/RegionStateNodeLock.html#owner">owner</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#regionInfo">regionInfo</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/Queue.html?is-external=true" title="class or interface in java.util">Queue</a><<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.QueueEntry.html" title="interface in org.apache.hadoop.hbase.master.assignment">RegionStateNodeLock.QueueEntry</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#waitingQueue">waitingQueue</a></span></code> </td> |
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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/master/assignment/RegionStateNodeLock.html#RegionStateNodeLock-org.apache.hadoop.hbase.client.RegionInfo-">RegionStateNodeLock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a> regionInfo)</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) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#isLocked--">isLocked</a></span>()</code> |
| <div class="block">Check whether the lock is locked by someone.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#isLockedBy-java.lang.Object-">isLockedBy</a></span>(<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> lockBy)</code> |
| <div class="block">Check whether the lock is locked by the given <code>lockBy</code>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#lock--">lock</a></span>()</code> |
| <div class="block">Normal lock, will set the current thread as owner.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#lock-org.apache.hadoop.hbase.procedure2.Procedure-java.lang.Runnable-">lock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a><?> proc, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a> wakeUp)</code> |
| <div class="block">Lock by a procedure.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#lock0-org.apache.hadoop.hbase.master.assignment.RegionStateNodeLock.QueueEntry-">lock0</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.QueueEntry.html" title="interface in org.apache.hadoop.hbase.master.assignment">RegionStateNodeLock.QueueEntry</a> entry)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#tryLock--">tryLock</a></span>()</code> |
| <div class="block">Normal tryLock, will set the current thread as owner.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#tryLock-org.apache.hadoop.hbase.procedure2.Procedure-">tryLock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a><?> proc)</code> |
| <div class="block">TryLock by a procedure.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#tryLock0-java.lang.Object-">tryLock0</a></span>(<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> lockBy)</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#unlock--">unlock</a></span>()</code> |
| <div class="block">Normal unLock, will use the current thread as owner.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#unlock-org.apache.hadoop.hbase.procedure2.Procedure-">unlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a><?> proc)</code> |
| <div class="block">Unlock by a procedure.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#unlock0-java.lang.Object-">unlock0</a></span>(<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> unlockBy)</code> </td> |
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| <h4>regionInfo</h4> |
| <pre>private final <a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.49">regionInfo</a></pre> |
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| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html?is-external=true" title="class or interface in java.util.concurrent.locks">Lock</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.51">lock</a></pre> |
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| <h4>waitingQueue</h4> |
| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</a><<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.QueueEntry.html" title="interface in org.apache.hadoop.hbase.master.assignment">RegionStateNodeLock.QueueEntry</a>> <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.53">waitingQueue</a></pre> |
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| <pre><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.83">RegionStateNodeLock</a>(<a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a> regionInfo)</pre> |
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| <h4>lock0</h4> |
| <pre>private void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.87">lock0</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.QueueEntry.html" title="interface in org.apache.hadoop.hbase.master.assignment">RegionStateNodeLock.QueueEntry</a> entry) |
| throws <a href="../../../../../../org/apache/hadoop/hbase/procedure2/ProcedureSuspendedException.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureSuspendedException</a></pre> |
| <dl> |
| <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></dd> |
| </dl> |
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| </ul> |
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| <h4>tryLock0</h4> |
| <pre>private boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.108">tryLock0</a>(<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> lockBy)</pre> |
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| <a name="unlock0-java.lang.Object-"> |
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| <h4>unlock0</h4> |
| <pre>private void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.128">unlock0</a>(<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> unlockBy)</pre> |
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| <a name="lock--"> |
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| <h4>lock</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.155">lock</a>()</pre> |
| <div class="block">Normal lock, will set the current thread as owner. Typically you should use try...finally to |
| call unlock in the finally block.</div> |
| </li> |
| </ul> |
| <a name="tryLock--"> |
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| <h4>tryLock</h4> |
| <pre>boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.192">tryLock</a>()</pre> |
| <div class="block">Normal tryLock, will set the current thread as owner. Typically you should use try...finally to |
| call unlock in the finally block.</div> |
| </li> |
| </ul> |
| <a name="unlock--"> |
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| <h4>unlock</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.200">unlock</a>()</pre> |
| <div class="block">Normal unLock, will use the current thread as owner. Typically you should use try...finally to |
| call unlock in the finally block.</div> |
| </li> |
| </ul> |
| <a name="lock-org.apache.hadoop.hbase.procedure2.Procedure-java.lang.Runnable-"> |
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| <h4>lock</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.212">lock</a>(<a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a><?> proc, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a> wakeUp) |
| throws <a href="../../../../../../org/apache/hadoop/hbase/procedure2/ProcedureSuspendedException.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureSuspendedException</a></pre> |
| <div class="block">Lock by a procedure. You can release the lock in another thread. |
| <p> |
| When the procedure can not get the lock immediately, a ProcedureSuspendedException will be |
| thrown to suspend the procedure. And when we want to wake up a procedure, we will call the |
| <code>wakeUp</code> action. Usually in the <code>wakeUp</code> action you should add the procedure back |
| to procedure scheduler.</div> |
| <dl> |
| <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></dd> |
| </dl> |
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| <a name="tryLock-org.apache.hadoop.hbase.procedure2.Procedure-"> |
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| <h4>tryLock</h4> |
| <pre>boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.246">tryLock</a>(<a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a><?> proc)</pre> |
| <div class="block">TryLock by a procedure. You can release the lock in another thread.</div> |
| </li> |
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| <a name="unlock-org.apache.hadoop.hbase.procedure2.Procedure-"> |
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| <h4>unlock</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.253">unlock</a>(<a href="../../../../../../org/apache/hadoop/hbase/procedure2/Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a><?> proc)</pre> |
| <div class="block">Unlock by a procedure. You do not need to call this method in the same thread with lock.</div> |
| </li> |
| </ul> |
| <a name="isLocked--"> |
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| <h4>isLocked</h4> |
| <pre>boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.260">isLocked</a>()</pre> |
| <div class="block">Check whether the lock is locked by someone.</div> |
| </li> |
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| <a name="isLockedBy-java.lang.Object-"> |
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| <h4>isLockedBy</h4> |
| <pre>boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.html#line.272">isLockedBy</a>(<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> lockBy)</pre> |
| <div class="block">Check whether the lock is locked by the given <code>lockBy</code>.</div> |
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