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| <div class="subTitle">org.apache.hadoop.hbase</div> |
| <h2 title="Class ZNodeClearer" class="title">Class ZNodeClearer</h2> |
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| <li>org.apache.hadoop.hbase.ZNodeClearer</li> |
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| <pre>@InterfaceAudience.Private |
| public final class <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.48">ZNodeClearer</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"><p>Contains a set of methods for the collaboration between the start/stop scripts and the |
| servers. It allows to delete immediately the znode when the master or the regions server crashes. |
| The region server / master writes a specific file when it starts / becomes main master. When they |
| end properly, they delete the file.</p> |
| <p>In the script, we check for the existence of these files when the program ends. If they still |
| exist we conclude that the server crashed, likely without deleting their znode. To have a faster |
| recovery we delete immediately the znode.</p> |
| <p>The strategy depends on the server type. For a region server we store the znode path in the |
| file, and use it to delete it. for a master, as the znode path constant whatever the server, we |
| check its content to make sure that the backup server is not now in charge.</p></div> |
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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/ZNodeClearer.html#LOG">LOG</a></span></code> </td> |
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| <td class="colFirst"><code>private </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ZNodeClearer.html#ZNodeClearer--">ZNodeClearer</a></span>()</code> </td> |
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| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ZNodeClearer.html#clear-org.apache.hadoop.conf.Configuration-">clear</a></span>(org.apache.hadoop.conf.Configuration conf)</code> |
| <div class="block">Delete the master znode if its content (ServerName string) is the same |
| as the one in the znode file.</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/ZNodeClearer.html#deleteMyEphemeralNodeOnDisk--">deleteMyEphemeralNodeOnDisk</a></span>()</code> |
| <div class="block">delete the znode file</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <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/ZNodeClearer.html#getMyEphemeralNodeFileName--">getMyEphemeralNodeFileName</a></span>()</code> |
| <div class="block">Get the name of the file used to store the znode contents</div> |
| </td> |
| </tr> |
| <tr id="i3" 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/ZNodeClearer.html#parseMasterServerName-java.lang.String-">parseMasterServerName</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> rsZnodePath)</code> |
| <div class="block">See HBASE-14861.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <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/ZNodeClearer.html#readMyEphemeralNodeOnDisk--">readMyEphemeralNodeOnDisk</a></span>()</code> |
| <div class="block">read the content of znode file, expects a single line.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/ZNodeClearer.html#writeMyEphemeralNodeOnDisk-java.lang.String-">writeMyEphemeralNodeOnDisk</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> fileContent)</code> |
| <div class="block">Logs the errors without failing on exception.</div> |
| </td> |
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| <pre>private static final org.slf4j.Logger <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.49">LOG</a></pre> |
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| <pre>private <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.51">ZNodeClearer</a>()</pre> |
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| <h4>writeMyEphemeralNodeOnDisk</h4> |
| <pre>public static void <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.56">writeMyEphemeralNodeOnDisk</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> fileContent)</pre> |
| <div class="block">Logs the errors without failing on exception.</div> |
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| <h4>readMyEphemeralNodeOnDisk</h4> |
| <pre>public 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> <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.92">readMyEphemeralNodeOnDisk</a>() |
| 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">read the content of znode file, expects a single line.</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 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> <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.111">getMyEphemeralNodeFileName</a>()</pre> |
| <div class="block">Get the name of the file used to store the znode contents</div> |
| </li> |
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| <pre>public static void <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.118">deleteMyEphemeralNodeOnDisk</a>()</pre> |
| <div class="block">delete the znode file</div> |
| </li> |
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| <h4>parseMasterServerName</h4> |
| <pre>public 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> <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.133">parseMasterServerName</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> rsZnodePath)</pre> |
| <div class="block">See HBASE-14861. We are extracting master ServerName from rsZnodePath |
| example: "/hbase/rs/server.example.com,16020,1448266496481"</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>rsZnodePath</code> - from HBASE_ZNODE_FILE</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>String representation of ServerName or null if fails</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="clear-org.apache.hadoop.conf.Configuration-"> |
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| <h4>clear</h4> |
| <pre>public static boolean <a href="../../../../src-html/org/apache/hadoop/hbase/ZNodeClearer.html#line.150">clear</a>(org.apache.hadoop.conf.Configuration conf)</pre> |
| <div class="block">Delete the master znode if its content (ServerName string) is the same |
| as the one in the znode file. (env: HBASE_ZNODE_FILE). I case of master-rs |
| colloaction we extract ServerName string from rsZnode path.(HBASE-14861)</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true on successful deletion, false otherwise.</dd> |
| </dl> |
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