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| <div class="subTitle">org.apache.hadoop.hbase</div> |
| <h2 title="Class ChoreService" class="title">Class ChoreService</h2> |
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| <li>org.apache.hadoop.hbase.ChoreService</li> |
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| <pre>@InterfaceAudience.Public |
| public class <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.54">ChoreService</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">ChoreService is a service that can be used to schedule instances of <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase"><code>ScheduledChore</code></a> to run |
| periodically while sharing threads. The ChoreService is backed by a |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledThreadPoolExecutor.html?is-external=true" title="class or interface in java.util.concurrent"><code>ScheduledThreadPoolExecutor</code></a> whose core pool size changes dynamically depending on the |
| number of <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase"><code>ScheduledChore</code></a> scheduled. All of the threads in the core thread pool of the |
| underlying <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledThreadPoolExecutor.html?is-external=true" title="class or interface in java.util.concurrent"><code>ScheduledThreadPoolExecutor</code></a> are set to be daemon threads. |
| <p> |
| The ChoreService provides the ability to schedule, cancel, and trigger instances of |
| <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase"><code>ScheduledChore</code></a>. The ChoreService also provides the ability to check on the status of |
| scheduled chores. The number of threads used by the ChoreService changes based on the scheduling |
| load and whether or not the scheduled chores are executing on time. As more chores are scheduled, |
| there may be a need to increase the number of threads if it is noticed that chores are no longer |
| meeting their scheduled start times. On the other hand, as chores are cancelled, an attempt is |
| made to reduce the number of running threads to see if chores can still meet their start times |
| with a smaller thread pool. |
| <p> |
| When finished with a ChoreService it is good practice to call <a href="../../../../org/apache/hadoop/hbase/ChoreService.html#shutdown--"><code>shutdown()</code></a>. |
| Calling this method ensures that all scheduled chores are cancelled and cleaned up properly.</div> |
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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>(package private) static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.ChoreServiceThreadFactory.html" title="class in org.apache.hadoop.hbase">ChoreService.ChoreServiceThreadFactory</a></span></code> |
| <div class="block">Custom ThreadFactory used with the ScheduledThreadPoolExecutor so that all the threads are |
| daemon threads, and thus, don't prevent the JVM from shutting down</div> |
| </td> |
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| <h3>Field Summary</h3> |
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| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <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/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a><<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#choresMissingStartTime">choresMissingStartTime</a></span></code> |
| <div class="block">Maps chores to Booleans which indicate whether or not a chore has caused an increase in the |
| core pool size of the ScheduledThreadPoolExecutor.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#coreThreadPoolPrefix">coreThreadPoolPrefix</a></span></code> |
| <div class="block">The coreThreadPoolPrefix is the prefix that will be applied to all threads within the |
| ScheduledThreadPoolExecutor.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#MIN_CORE_POOL_SIZE">MIN_CORE_POOL_SIZE</a></span></code> |
| <div class="block">The minimum number of threads in the core pool of the underlying ScheduledThreadPoolExecutor</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a><<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledFuture.html?is-external=true" title="class or interface in java.util.concurrent">ScheduledFuture</a><?>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#scheduledChores">scheduledChores</a></span></code> |
| <div class="block">Maps chores to their futures.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledThreadPoolExecutor.html?is-external=true" title="class or interface in java.util.concurrent">ScheduledThreadPoolExecutor</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#scheduler">scheduler</a></span></code> |
| <div class="block">This thread pool is used to schedule all of the Chores</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#ChoreService-java.lang.String-">ChoreService</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> coreThreadPoolPrefix)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#ChoreService-java.lang.String-boolean-">ChoreService</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> coreThreadPoolPrefix, |
| boolean jitter)</code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#ChoreService-java.lang.String-int-boolean-">ChoreService</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> coreThreadPoolPrefix, |
| int corePoolSize, |
| boolean jitter)</code> </td> |
| </tr> |
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| <!-- ========== METHOD SUMMARY =========== --> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <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>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#cancelAllChores-boolean-">cancelAllChores</a></span>(boolean mayInterruptIfRunning)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#cancelChore-org.apache.hadoop.hbase.ScheduledChore-">cancelChore</a></span>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</code> |
| <div class="block">Cancel any ongoing schedules that this chore has with the implementer of this interface.</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/ChoreService.html#cancelChore-org.apache.hadoop.hbase.ScheduledChore-boolean-">cancelChore</a></span>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore, |
| boolean mayInterruptIfRunning)</code> |
| <div class="block">Cancel any ongoing schedules that this chore has with the implementer of this interface.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>(package private) int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#getCorePoolSize--">getCorePoolSize</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>(package private) int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#getNumberOfChoresMissingStartTime--">getNumberOfChoresMissingStartTime</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>(package private) int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#getNumberOfScheduledChores--">getNumberOfScheduledChores</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#isChoreScheduled-org.apache.hadoop.hbase.ScheduledChore-">isChoreScheduled</a></span>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#isShutdown--">isShutdown</a></span>()</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#isTerminated--">isTerminated</a></span>()</code> </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/ChoreService.html#onChoreMissedStartTime-org.apache.hadoop.hbase.ScheduledChore-">onChoreMissedStartTime</a></span>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</code> |
| <div class="block">A callback that tells the implementer of this interface that one of the scheduled chores is |
| missing its start time.</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/ChoreService.html#printChoreDetails-java.lang.String-org.apache.hadoop.hbase.ScheduledChore-">printChoreDetails</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> header, |
| <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</code> |
| <div class="block">Prints a summary of important details about the chore.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#printChoreServiceDetails-java.lang.String-">printChoreServiceDetails</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> header)</code> |
| <div class="block">Prints a summary of important details about the service.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#requestCorePoolDecrease--">requestCorePoolDecrease</a></span>()</code> |
| <div class="block">Represents a request to decrease the number of core pool threads.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#requestCorePoolIncrease--">requestCorePoolIncrease</a></span>()</code> |
| <div class="block">Represents a request to increase the number of core pool threads.</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#rescheduleChore-org.apache.hadoop.hbase.ScheduledChore-">rescheduleChore</a></span>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</code> </td> |
| </tr> |
| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#scheduleChore-org.apache.hadoop.hbase.ScheduledChore-">scheduleChore</a></span>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</code> </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#shutdown--">shutdown</a></span>()</code> |
| <div class="block">shutdown the service.</div> |
| </td> |
| </tr> |
| <tr id="i17" class="rowColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ChoreService.html#triggerNow-org.apache.hadoop.hbase.ScheduledChore-">triggerNow</a></span>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</code> |
| <div class="block">This method tries to execute the chore immediately.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| </a> |
| <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> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.detail"> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="LOG"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>LOG</h4> |
| <pre>private static final org.slf4j.Logger <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.55">LOG</a></pre> |
| </li> |
| </ul> |
| <a name="MIN_CORE_POOL_SIZE"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>MIN_CORE_POOL_SIZE</h4> |
| <pre>@InterfaceAudience.Private |
| public static final int <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.61">MIN_CORE_POOL_SIZE</a></pre> |
| <div class="block">The minimum number of threads in the core pool of the underlying ScheduledThreadPoolExecutor</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.hbase.ChoreService.MIN_CORE_POOL_SIZE">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="scheduler"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>scheduler</h4> |
| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledThreadPoolExecutor.html?is-external=true" title="class or interface in java.util.concurrent">ScheduledThreadPoolExecutor</a> <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.66">scheduler</a></pre> |
| <div class="block">This thread pool is used to schedule all of the Chores</div> |
| </li> |
| </ul> |
| <a name="scheduledChores"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>scheduledChores</h4> |
| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a><<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledFuture.html?is-external=true" title="class or interface in java.util.concurrent">ScheduledFuture</a><?>> <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.71">scheduledChores</a></pre> |
| <div class="block">Maps chores to their futures. Futures are used to control a chore's schedule</div> |
| </li> |
| </ul> |
| <a name="choresMissingStartTime"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>choresMissingStartTime</h4> |
| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a><<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a>> <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.79">choresMissingStartTime</a></pre> |
| <div class="block">Maps chores to Booleans which indicate whether or not a chore has caused an increase in the |
| core pool size of the ScheduledThreadPoolExecutor. Each chore should only be allowed to |
| increase the core pool size by 1 (otherwise a single long running chore whose execution is |
| longer than its period would be able to spawn too many threads).</div> |
| </li> |
| </ul> |
| <a name="coreThreadPoolPrefix"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>coreThreadPoolPrefix</h4> |
| <pre>private final <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> <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.87">coreThreadPoolPrefix</a></pre> |
| <div class="block">The coreThreadPoolPrefix is the prefix that will be applied to all threads within the |
| ScheduledThreadPoolExecutor. The prefix is typically related to the Server that the service is |
| running on. The prefix is useful because it allows us to monitor how the thread pool of a |
| particular service changes over time VIA thread dumps.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a name="ChoreService-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>ChoreService</h4> |
| <pre>@InterfaceAudience.Private |
| public <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.95">ChoreService</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> coreThreadPoolPrefix)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>coreThreadPoolPrefix</code> - Prefix that will be applied to the Thread name of all threads |
| spawned by this service</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="ChoreService-java.lang.String-boolean-"> |
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| </a> |
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| <h4>ChoreService</h4> |
| <pre>public <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.105">ChoreService</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> coreThreadPoolPrefix, |
| boolean jitter)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>coreThreadPoolPrefix</code> - Prefix that will be applied to the Thread name of all threads |
| spawned by this service</dd> |
| <dd><code>jitter</code> - Should chore service add some jitter for all of the scheduled chores. When set |
| to true this will add -10% to 10% jitter.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="ChoreService-java.lang.String-int-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ChoreService</h4> |
| <pre>public <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.118">ChoreService</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> coreThreadPoolPrefix, |
| int corePoolSize, |
| boolean jitter)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>coreThreadPoolPrefix</code> - Prefix that will be applied to the Thread name of all threads |
| spawned by this service</dd> |
| <dd><code>corePoolSize</code> - The initial size to set the core pool of the ScheduledThreadPoolExecutor |
| to during initialization. The default size is 1, but specifying a larger size may be |
| beneficial if you know that 1 thread will not be enough.</dd> |
| <dd><code>jitter</code> - Should chore service add some jitter for all of the scheduled chores. When set |
| to true this will add -10% to 10% jitter.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="scheduleChore-org.apache.hadoop.hbase.ScheduledChore-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>scheduleChore</h4> |
| <pre>public boolean <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.143">scheduleChore</a>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>chore</code> - Chore to be scheduled. If the chore is already scheduled with another ChoreService |
| instance, that schedule will be cancelled (i.e. a Chore can only ever be scheduled |
| with a single ChoreService instance).</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true when the chore was successfully scheduled. false when the scheduling failed |
| (typically occurs when a chore is scheduled during shutdown of service)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="rescheduleChore-org.apache.hadoop.hbase.ScheduledChore-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>rescheduleChore</h4> |
| <pre>private void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.183">rescheduleChore</a>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>chore</code> - The Chore to be rescheduled. If the chore is not scheduled with this ChoreService |
| yet then this call is equivalent to a call to scheduleChore.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="cancelChore-org.apache.hadoop.hbase.ScheduledChore-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>cancelChore</h4> |
| <pre>void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.202">cancelChore</a>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</pre> |
| <div class="block">Cancel any ongoing schedules that this chore has with the implementer of this interface. |
| <p/> |
| Call <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html#cancel--"><code>ScheduledChore.cancel()</code></a> to cancel a <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase"><code>ScheduledChore</code></a>, in |
| <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html#cancel--"><code>ScheduledChore.cancel()</code></a> method we will call this method to remove the |
| <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase"><code>ScheduledChore</code></a> from this <a href="../../../../org/apache/hadoop/hbase/ChoreService.html" title="class in org.apache.hadoop.hbase"><code>ChoreService</code></a>.</div> |
| </li> |
| </ul> |
| <a name="cancelChore-org.apache.hadoop.hbase.ScheduledChore-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>cancelChore</h4> |
| <pre>void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.215">cancelChore</a>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore, |
| boolean mayInterruptIfRunning)</pre> |
| <div class="block">Cancel any ongoing schedules that this chore has with the implementer of this interface. |
| <p/> |
| Call <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html#cancel-boolean-"><code>ScheduledChore.cancel(boolean)</code></a> to cancel a <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase"><code>ScheduledChore</code></a>, in |
| <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html#cancel-boolean-"><code>ScheduledChore.cancel(boolean)</code></a> method we will call this method to remove the |
| <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase"><code>ScheduledChore</code></a> from this <a href="../../../../org/apache/hadoop/hbase/ChoreService.html" title="class in org.apache.hadoop.hbase"><code>ChoreService</code></a>.</div> |
| </li> |
| </ul> |
| <a name="isChoreScheduled-org.apache.hadoop.hbase.ScheduledChore-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isChoreScheduled</h4> |
| <pre>@InterfaceAudience.Private |
| public boolean <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.234">isChoreScheduled</a>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true when the chore is scheduled with the implementer of this interface</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="triggerNow-org.apache.hadoop.hbase.ScheduledChore-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>triggerNow</h4> |
| <pre>void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.245">triggerNow</a>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</pre> |
| <div class="block">This method tries to execute the chore immediately. If the chore is executing at the time of |
| this call, the chore will begin another execution as soon as the current execution finishes</div> |
| </li> |
| </ul> |
| <a name="getNumberOfScheduledChores--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getNumberOfScheduledChores</h4> |
| <pre>int <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.253">getNumberOfScheduledChores</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>number of chores that this service currently has scheduled</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getNumberOfChoresMissingStartTime--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getNumberOfChoresMissingStartTime</h4> |
| <pre>int <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.261">getNumberOfChoresMissingStartTime</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>number of chores that this service currently has scheduled that are missing their |
| scheduled start time</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCorePoolSize--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getCorePoolSize</h4> |
| <pre>int <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.268">getCorePoolSize</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>number of threads in the core pool of the underlying ScheduledThreadPoolExecutor</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="requestCorePoolIncrease--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>requestCorePoolIncrease</h4> |
| <pre>private boolean <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.303">requestCorePoolIncrease</a>()</pre> |
| <div class="block">Represents a request to increase the number of core pool threads. Typically a request |
| originates from the fact that the current core pool size is not sufficient to service all of |
| the currently running Chores</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true when the request to increase the core pool size succeeds</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="requestCorePoolDecrease--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>requestCorePoolDecrease</h4> |
| <pre>private void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.320">requestCorePoolDecrease</a>()</pre> |
| <div class="block">Represents a request to decrease the number of core pool threads. Typically a request |
| originates from the fact that the current core pool size is more than sufficient to service the |
| running Chores.</div> |
| </li> |
| </ul> |
| <a name="onChoreMissedStartTime-org.apache.hadoop.hbase.ScheduledChore-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onChoreMissedStartTime</h4> |
| <pre>void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.337">onChoreMissedStartTime</a>(<a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</pre> |
| <div class="block">A callback that tells the implementer of this interface that one of the scheduled chores is |
| missing its start time. The implication of a chore missing its start time is that the service's |
| current means of scheduling may not be sufficient to handle the number of ongoing chores (the |
| other explanation is that the chore's execution time is greater than its scheduled period). The |
| service should try to increase its concurrency when this callback is received.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>chore</code> - The chore that missed its start time</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="shutdown--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>shutdown</h4> |
| <pre>public void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.365">shutdown</a>()</pre> |
| <div class="block">shutdown the service. Any chores that are scheduled for execution will be cancelled. Any chores |
| in the middle of execution will be interrupted and shutdown. This service will be unusable |
| after this method has been called (i.e. future scheduling attempts will fail). |
| <p/> |
| Notice that, this will only clean the chore from this ChoreService but you could still schedule |
| the chore with other ChoreService.</div> |
| </li> |
| </ul> |
| <a name="isShutdown--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isShutdown</h4> |
| <pre>public boolean <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.380">isShutdown</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true when the service is shutdown and thus cannot be used anymore</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isTerminated--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isTerminated</h4> |
| <pre>public boolean <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.387">isTerminated</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true when the service is shutdown and all threads have terminated</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="cancelAllChores-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>cancelAllChores</h4> |
| <pre>private void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.391">cancelAllChores</a>(boolean mayInterruptIfRunning)</pre> |
| </li> |
| </ul> |
| <a name="printChoreDetails-java.lang.String-org.apache.hadoop.hbase.ScheduledChore-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>printChoreDetails</h4> |
| <pre>private void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.405">printChoreDetails</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> header, |
| <a href="../../../../org/apache/hadoop/hbase/ScheduledChore.html" title="class in org.apache.hadoop.hbase">ScheduledChore</a> chore)</pre> |
| <div class="block">Prints a summary of important details about the chore. Used for debugging purposes</div> |
| </li> |
| </ul> |
| <a name="printChoreServiceDetails-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>printChoreServiceDetails</h4> |
| <pre>private void <a href="../../../../src-html/org/apache/hadoop/hbase/ChoreService.html#line.423">printChoreServiceDetails</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> header)</pre> |
| <div class="block">Prints a summary of important details about the service. Used for debugging purposes</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
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