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| <div class="subTitle">org.apache.hadoop.util</div> |
| <h2 title="Class ShutdownHookManager" class="title">Class ShutdownHookManager</h2> |
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| <li>org.apache.hadoop.util.ShutdownHookManager</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public final class <span class="typeNameLabel">ShutdownHookManager</span> |
| 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">The <code>ShutdownHookManager</code> enables running shutdownHook |
| in a deterministic order, higher priority first. |
| <p> |
| The JVM runs ShutdownHooks in a non-deterministic order or in parallel. |
| This class registers a single JVM shutdownHook and run all the |
| shutdownHooks registered to it (to this class) in order based on their |
| priority. |
| |
| Unless a hook was registered with a shutdown explicitly set through |
| <a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#addShutdownHook-java.lang.Runnable-int-long-java.util.concurrent.TimeUnit-"><code>addShutdownHook(Runnable, int, long, TimeUnit)</code></a>, |
| the shutdown time allocated to it is set by the configuration option |
| <a href="../../../../org/apache/hadoop/fs/CommonConfigurationKeysPublic.html#SERVICE_SHUTDOWN_TIMEOUT"><code>CommonConfigurationKeysPublic.SERVICE_SHUTDOWN_TIMEOUT</code></a> in |
| <code>core-site.xml</code>, with a default value of |
| <a href="../../../../org/apache/hadoop/fs/CommonConfigurationKeysPublic.html#SERVICE_SHUTDOWN_TIMEOUT_DEFAULT"><code>CommonConfigurationKeysPublic.SERVICE_SHUTDOWN_TIMEOUT_DEFAULT</code></a> |
| seconds.</div> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#TIME_UNIT_DEFAULT">TIME_UNIT_DEFAULT</a></span></code> |
| <div class="block">The default time unit used: seconds.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#TIMEOUT_MINIMUM">TIMEOUT_MINIMUM</a></span></code> |
| <div class="block">Minimum shutdown timeout: 1L second(s).</div> |
| </td> |
| </tr> |
| </table> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#addShutdownHook-java.lang.Runnable-int-">addShutdownHook</a></span>(<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> shutdownHook, |
| int priority)</code> |
| <div class="block">Adds a shutdownHook with a priority, the higher the priority |
| the earlier will run.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#addShutdownHook-java.lang.Runnable-int-long-java.util.concurrent.TimeUnit-">addShutdownHook</a></span>(<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> shutdownHook, |
| int priority, |
| long timeout, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a> unit)</code> |
| <div class="block">Adds a shutdownHook with a priority and timeout the higher the priority |
| the earlier will run.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#clearShutdownHooks--">clearShutdownHooks</a></span>()</code> |
| <div class="block">clear all registered shutdownHooks.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html" title="class in org.apache.hadoop.util">ShutdownHookManager</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#get--">get</a></span>()</code> |
| <div class="block">Return <code>ShutdownHookManager</code> singleton.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#hasShutdownHook-java.lang.Runnable-">hasShutdownHook</a></span>(<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> shutdownHook)</code> |
| <div class="block">Indicates if a shutdownHook is registered or not.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html#isShutdownInProgress--">isShutdownInProgress</a></span>()</code> |
| <div class="block">Indicates if shutdown is in progress or not.</div> |
| </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/util/ShutdownHookManager.html#removeShutdownHook-java.lang.Runnable-">removeShutdownHook</a></span>(<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> shutdownHook)</code> |
| <div class="block">Removes a shutdownHook.</div> |
| </td> |
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| <h4>TIMEOUT_MINIMUM</h4> |
| <pre>public static final long TIMEOUT_MINIMUM</pre> |
| <div class="block">Minimum shutdown timeout: 1L second(s).</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.hadoop.util.ShutdownHookManager.TIMEOUT_MINIMUM">Constant Field Values</a></dd> |
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| <h4>TIME_UNIT_DEFAULT</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a> TIME_UNIT_DEFAULT</pre> |
| <div class="block">The default time unit used: seconds.</div> |
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| <h4>get</h4> |
| <pre>@InterfaceAudience.Public |
| public static <a href="../../../../org/apache/hadoop/util/ShutdownHookManager.html" title="class in org.apache.hadoop.util">ShutdownHookManager</a> get()</pre> |
| <div class="block">Return <code>ShutdownHookManager</code> singleton.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>ShutdownHookManager</code> singleton.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="addShutdownHook-java.lang.Runnable-int-"> |
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| <h4>addShutdownHook</h4> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public void addShutdownHook(<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> shutdownHook, |
| int priority)</pre> |
| <div class="block">Adds a shutdownHook with a priority, the higher the priority |
| the earlier will run. ShutdownHooks with same priority run |
| in a non-deterministic order.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>shutdownHook</code> - shutdownHook <code>Runnable</code></dd> |
| <dd><code>priority</code> - priority of the shutdownHook.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="addShutdownHook-java.lang.Runnable-int-long-java.util.concurrent.TimeUnit-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addShutdownHook</h4> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public void addShutdownHook(<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> shutdownHook, |
| int priority, |
| long timeout, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a> unit)</pre> |
| <div class="block">Adds a shutdownHook with a priority and timeout the higher the priority |
| the earlier will run. ShutdownHooks with same priority run |
| in a non-deterministic order. The shutdown hook will be terminated if it |
| has not been finished in the specified period of time.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>shutdownHook</code> - shutdownHook <code>Runnable</code></dd> |
| <dd><code>priority</code> - priority of the shutdownHook</dd> |
| <dd><code>timeout</code> - timeout of the shutdownHook</dd> |
| <dd><code>unit</code> - unit of the timeout <code>TimeUnit</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="removeShutdownHook-java.lang.Runnable-"> |
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| <li class="blockList"> |
| <h4>removeShutdownHook</h4> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public boolean removeShutdownHook(<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> shutdownHook)</pre> |
| <div class="block">Removes a shutdownHook.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>shutdownHook</code> - shutdownHook to remove.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>TRUE if the shutdownHook was registered and removed, |
| FALSE otherwise.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hasShutdownHook-java.lang.Runnable-"> |
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| <h4>hasShutdownHook</h4> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public boolean hasShutdownHook(<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> shutdownHook)</pre> |
| <div class="block">Indicates if a shutdownHook is registered or not.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>shutdownHook</code> - shutdownHook to check if registered.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>TRUE/FALSE depending if the shutdownHook is is registered.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isShutdownInProgress--"> |
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| </a> |
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| <h4>isShutdownInProgress</h4> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public boolean isShutdownInProgress()</pre> |
| <div class="block">Indicates if shutdown is in progress or not.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>TRUE if the shutdown is in progress, otherwise FALSE.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="clearShutdownHooks--"> |
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| <h4>clearShutdownHooks</h4> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public void clearShutdownHooks()</pre> |
| <div class="block">clear all registered shutdownHooks.</div> |
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