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| <h2 title="Class ShutdownHook" class="title">Class ShutdownHook</h2> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ShutdownHook.html#line.42">ShutdownHook</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">Manage regionserver shutdown hooks.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#install-org.apache.hadoop.conf.Configuration-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.hbase.Stoppable-java.lang.Thread-"><code>install(Configuration, FileSystem, Stoppable, Thread)</code></a></dd> |
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| <td class="colFirst"><code>(package private) static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.DoNothingStoppable.html" title="class in org.apache.hadoop.hbase.regionserver">ShutdownHook.DoNothingStoppable</a></span></code> </td> |
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| <td class="colFirst"><code>(package private) static class </code></td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>private static class </code></td> |
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| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#CLIENT_FINALIZER_DATA_METHOD">CLIENT_FINALIZER_DATA_METHOD</a></span></code> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>static <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/regionserver/ShutdownHook.html#FS_SHUTDOWN_HOOK_WAIT">FS_SHUTDOWN_HOOK_WAIT</a></span></code> |
| <div class="block">Key for a long configuration on how much time to wait on the fs shutdown |
| hook.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<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>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#fsShutdownHooks">fsShutdownHooks</a></span></code> |
| <div class="block">A place for keeping track of all the filesystem shutdown hooks that need |
| to be executed after the last regionserver referring to a given filesystem |
| stops.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#LOG">LOG</a></span></code> </td> |
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| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#RUN_SHUTDOWN_HOOK">RUN_SHUTDOWN_HOOK</a></span></code> |
| <div class="block">Key for boolean configuration whose default is true.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#ShutdownHook--">ShutdownHook</a></span>()</code> </td> |
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| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#install-org.apache.hadoop.conf.Configuration-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.hbase.Stoppable-java.lang.Thread-">install</a></span>(org.apache.hadoop.conf.Configuration conf, |
| org.apache.hadoop.fs.FileSystem fs, |
| <a href="../../../../../org/apache/hadoop/hbase/Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a> stop, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a> threadToJoin)</code> |
| <div class="block">Install a shutdown hook that calls stop on the passed Stoppable |
| and then thread joins against the passed <code>threadToJoin</code>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#main-java.lang.String:A-">main</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>[] args)</code> |
| <div class="block">Main to test basic functionality.</div> |
| </td> |
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| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private static <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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#suppressHdfsShutdownHook-org.apache.hadoop.fs.FileSystem-">suppressHdfsShutdownHook</a></span>(org.apache.hadoop.fs.FileSystem fs)</code> </td> |
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| <pre>private static final org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ShutdownHook.html#line.43">LOG</a></pre> |
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| <pre>public static 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/regionserver/ShutdownHook.html#line.49">RUN_SHUTDOWN_HOOK</a></pre> |
| <div class="block">Key for boolean configuration whose default is true.</div> |
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| <div class="block">Key for a long configuration on how much time to wait on the fs shutdown |
| hook. Default is 30 seconds.</div> |
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| <h4>fsShutdownHooks</h4> |
| <pre>private static final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<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>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ShutdownHook.html#line.62">fsShutdownHooks</a></pre> |
| <div class="block">A place for keeping track of all the filesystem shutdown hooks that need |
| to be executed after the last regionserver referring to a given filesystem |
| stops. We keep track of the # of regionserver references in values of the map.</div> |
| </li> |
| </ul> |
| </li> |
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| <h4>ShutdownHook</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ShutdownHook.html#line.42">ShutdownHook</a>()</pre> |
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| <h4>install</h4> |
| <pre>public static void <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ShutdownHook.html#line.83">install</a>(org.apache.hadoop.conf.Configuration conf, |
| org.apache.hadoop.fs.FileSystem fs, |
| <a href="../../../../../org/apache/hadoop/hbase/Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a> stop, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a> threadToJoin)</pre> |
| <div class="block">Install a shutdown hook that calls stop on the passed Stoppable |
| and then thread joins against the passed <code>threadToJoin</code>. |
| When this thread completes, it then runs the hdfs thread (This install |
| removes the hdfs shutdown hook keeping a handle on it to run it after |
| <code>threadToJoin</code> has stopped). |
| |
| <p>To suppress all shutdown hook handling -- both the running of the |
| regionserver hook and of the hdfs hook code -- set |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/ShutdownHook.html#RUN_SHUTDOWN_HOOK"><code>RUN_SHUTDOWN_HOOK</code></a> in <code>Configuration</code> to |
| <code>false</code>. |
| This configuration value is checked when the hook code runs.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - </dd> |
| <dd><code>fs</code> - Instance of Filesystem used by the RegionServer</dd> |
| <dd><code>stop</code> - Installed shutdown hook will call stop against this passed |
| <code>Stoppable</code> instance.</dd> |
| <dd><code>threadToJoin</code> - After calling stop on <code>stop</code> will then |
| join this thread.</dd> |
| </dl> |
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| <h4>suppressHdfsShutdownHook</h4> |
| <pre>private static <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> <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ShutdownHook.html#line.156">suppressHdfsShutdownHook</a>(org.apache.hadoop.fs.FileSystem fs)</pre> |
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| <h4>main</h4> |
| <pre>public static void <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ShutdownHook.html#line.259">main</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>[] args) |
| 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">Main to test basic functionality. Run with clean hadoop 0.20 and hadoop |
| 0.21 and cloudera patched hadoop to make sure our shutdown hook handling |
| works for all compbinations. |
| Pass '-Dhbase.shutdown.hook=false' to test turning off the running of |
| shutdown hooks.</div> |
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