cassandra-server

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  <html lang="en"> <head>  <title>CommitLog (apache-cassandra API)</title> <meta name="date" content="2014-09-07"> <link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> </head> <body> <script type="text/javascript"> </script> <noscript> <div>JavaScript is disabled on your browser.</div> </noscript>  <div class="topNav"><a name="navbar_top">  </a><a href="#skip-navbar_top" title="Skip navigation links"></a><a name="navbar_top_firstrow">  </a> <ul class="navList" title="Navigation"> <li><a href="../../../../../overview-summary.html">Overview</a></li> <li><a href="package-summary.html">Package</a></li> <li class="navBarCell1Rev">Class</li> <li><a href="class-use/CommitLog.html">Use</a></li> <li><a href="package-tree.html">Tree</a></li> <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> <li><a 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<li>Nested | </li> <li><a href="#field_summary">Field</a> | </li> <li>Constr | </li> <li><a href="#method_summary">Method</a></li> </ul> <ul class="subNavList"> <li>Detail: </li> <li><a href="#field_detail">Field</a> | </li> <li>Constr | </li> <li><a href="#method_detail">Method</a></li> </ul> </div> <a name="skip-navbar_top">  </a></div>   <div class="header"> <div class="subTitle">org.apache.cassandra.db.commitlog</div> <h2 title="Class CommitLog" class="title">Class CommitLog</h2> </div> <div class="contentContainer"> <ul class="inheritance"> <li>java.lang.Object</li> <li> <ul class="inheritance"> <li>org.apache.cassandra.db.commitlog.CommitLog</li> </ul> </li> </ul> <div class="description"> <ul class="blockList"> <li class="blockList"> <dl> <dt>All Implemented Interfaces:</dt> <dd><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html" title="interface in org.apache.cassandra.db.commitlog">CommitLogMBean</a></dd> </dl> <hr> <br> <pre>public class <span class="strong">CommitLog</span> extends java.lang.Object implements <a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html" title="interface in org.apache.cassandra.db.commitlog">CommitLogMBean</a></pre> </li> </ul> </div> <div class="summary"> <ul class="blockList"> <li class="blockList">  <ul class="blockList"> <li class="blockList"><a name="field_summary">  </a> <h3>Field Summary</h3> <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> <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><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogSegmentManager.html" title="class in org.apache.cassandra.db.commitlog">CommitLogSegmentManager</a></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#allocator">allocator</a></strong></code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogArchiver.html" title="class in org.apache.cassandra.db.commitlog">CommitLogArchiver</a></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#archiver">archiver</a></strong></code> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>static <a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html" title="class in org.apache.cassandra.db.commitlog">CommitLog</a></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#instance">instance</a></strong></code> </td> </tr> </table> </li> </ul>  <ul class="blockList"> <li class="blockList"><a name="method_summary">  </a> <h3>Method Summary</h3> <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> <caption><span>Methods</span><span class="tabEnd"> </span></caption> <tr> <th class="colFirst" scope="col">Modifier and Type</th> <th class="colLast" scope="col">Method and Description</th> </tr> <tr class="altColor"> <td class="colFirst"><code>int</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#activeSegments()">activeSegments</a></strong>()</code> <div class="block">Used by tests.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../../../org/apache/cassandra/db/commitlog/ReplayPosition.html" title="class in org.apache.cassandra.db.commitlog">ReplayPosition</a></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#add(org.apache.cassandra.db.Mutation)">add</a></strong>(<a href="../../../../../org/apache/cassandra/db/Mutation.html" title="class in org.apache.cassandra.db">Mutation</a> mutation)</code> <div class="block">Add a Mutation to the commit log.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#discardCompletedSegments(java.util.UUID,%20org.apache.cassandra.db.commitlog.ReplayPosition)">discardCompletedSegments</a></strong>(java.util.UUID cfId, <a href="../../../../../org/apache/cassandra/db/commitlog/ReplayPosition.html" title="class in org.apache.cassandra.db.commitlog">ReplayPosition</a> context)</code> <div class="block">Modifies the per-CF dirty cursors of any commit log segments for the column family according to the position given.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#forceRecycleAllSegments()">forceRecycleAllSegments</a></strong>()</code> <div class="block">Flushes all dirty CFs, waiting for them to free and recycle any segments they were retaining</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#forceRecycleAllSegments(java.lang.Iterable)">forceRecycleAllSegments</a></strong>(java.lang.Iterable<java.util.UUID> droppedCfs)</code> <div class="block">Flushes all dirty CFs, waiting for them to free and recycle any segments they were retaining</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>java.util.List<java.lang.String></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#getActiveSegmentNames()">getActiveSegmentNames</a></strong>()</code> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>java.util.List<java.lang.String></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#getArchivingSegmentNames()">getArchivingSegmentNames</a></strong>()</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>long</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#getCompletedTasks()">getCompletedTasks</a></strong>()</code> <div class="block">Get the number of completed tasks</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../../../org/apache/cassandra/db/commitlog/ReplayPosition.html" title="class in org.apache.cassandra.db.commitlog">ReplayPosition</a></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#getContext()">getContext</a></strong>()</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>long</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#getPendingTasks()">getPendingTasks</a></strong>()</code> <div class="block">Get the number of tasks waiting to be executed</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>long</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#getTotalCommitlogSize()">getTotalCommitlogSize</a></strong>()</code> <div class="block">Get the current size used by all the commitlog segments.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>int</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#recover()">recover</a></strong>()</code> <div class="block">Perform recovery on commit logs located in the directory specified by the config file.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>int</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#recover(java.io.File...)">recover</a></strong>(java.io.File... clogs)</code> <div class="block">Perform recovery on a list of commit log files.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#recover(java.lang.String)">recover</a></strong>(java.lang.String path)</code> <div class="block">Perform recovery on a single commit log.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#requestExtraSync()">requestExtraSync</a></strong>()</code> <div class="block">Preempts the CLExecutor, telling to to sync immediately</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#resetUnsafe()">resetUnsafe</a></strong>()</code> <div class="block">FOR TESTING PURPOSES.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#shutdownBlocking()">shutdownBlocking</a></strong>()</code> <div class="block">Shuts down the threads used by the commit log, blocking until completion.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html#sync(boolean)">sync</a></strong>(boolean syncAllSegments)</code> <div class="block">Forces a disk flush on the commit log files that need it.</div> </td> </tr> </table> <ul class="blockList"> <li class="blockList"><a name="methods_inherited_from_class_java.lang.Object">  </a> <h3>Methods inherited from class java.lang.Object</h3> <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> </ul> </li> </ul> </li> </ul> </div> <div class="details"> <ul class="blockList"> <li class="blockList">  <ul class="blockList"> <li class="blockList"><a name="field_detail">  </a> <h3>Field Detail</h3> <a name="instance">  </a> <ul class="blockList"> <li class="blockList"> <h4>instance</h4> <pre>public static final <a href="../../../../../org/apache/cassandra/db/commitlog/CommitLog.html" title="class in org.apache.cassandra.db.commitlog">CommitLog</a> instance</pre> </li> </ul> <a name="allocator">  </a> <ul class="blockList"> <li class="blockList"> <h4>allocator</h4> <pre>public final <a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogSegmentManager.html" title="class in org.apache.cassandra.db.commitlog">CommitLogSegmentManager</a> allocator</pre> </li> </ul> <a name="archiver">  </a> <ul class="blockListLast"> <li class="blockList"> <h4>archiver</h4> <pre>public final <a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogArchiver.html" title="class in org.apache.cassandra.db.commitlog">CommitLogArchiver</a> archiver</pre> </li> </ul> </li> </ul>  <ul class="blockList"> <li class="blockList"><a name="method_detail">  </a> <h3>Method Detail</h3> <a name="recover()">  </a> <ul class="blockList"> <li class="blockList"> <h4>recover</h4> <pre>public int recover() throws java.io.IOException</pre> <div class="block">Perform recovery on commit logs located in the directory specified by the config file.</div> <dl><dt><span class="strong">Returns:</span></dt><dd>the number of mutations replayed</dd> <dt><span class="strong">Throws:</span></dt> <dd><code>java.io.IOException</code></dd></dl> </li> </ul> <a name="recover(java.io.File...)">  </a> <ul class="blockList"> <li class="blockList"> <h4>recover</h4> <pre>public int recover(java.io.File... clogs) throws java.io.IOException</pre> <div class="block">Perform recovery on a list of commit log files.</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>clogs</code> - the list of commit log files to replay</dd> <dt><span class="strong">Returns:</span></dt><dd>the number of mutations replayed</dd> <dt><span class="strong">Throws:</span></dt> <dd><code>java.io.IOException</code></dd></dl> </li> </ul> <a name="recover(java.lang.String)">  </a> <ul class="blockList"> <li class="blockList"> <h4>recover</h4> <pre>public void recover(java.lang.String path) throws java.io.IOException</pre> <div class="block">Perform recovery on a single commit log.</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#recover(java.lang.String)">recover</a></code> in interface <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html" title="interface in org.apache.cassandra.db.commitlog">CommitLogMBean</a></code></dd> <dt><span class="strong">Throws:</span></dt> <dd><code>java.io.IOException</code></dd></dl> </li> </ul> <a name="getContext()">  </a> <ul class="blockList"> <li class="blockList"> <h4>getContext</h4> <pre>public <a href="../../../../../org/apache/cassandra/db/commitlog/ReplayPosition.html" title="class in org.apache.cassandra.db.commitlog">ReplayPosition</a> getContext()</pre> <dl><dt><span class="strong">Returns:</span></dt><dd>a Future representing a ReplayPosition such that when it is ready, all Allocations created prior to the getContext call will be written to the log</dd></dl> </li> </ul> <a name="forceRecycleAllSegments(java.lang.Iterable)">  </a> <ul class="blockList"> <li class="blockList"> <h4>forceRecycleAllSegments</h4> <pre>public void forceRecycleAllSegments(java.lang.Iterable<java.util.UUID> droppedCfs)</pre> <div class="block">Flushes all dirty CFs, waiting for them to free and recycle any segments they were retaining</div> </li> </ul> <a name="forceRecycleAllSegments()">  </a> <ul class="blockList"> <li class="blockList"> <h4>forceRecycleAllSegments</h4> <pre>public void forceRecycleAllSegments()</pre> <div class="block">Flushes all dirty CFs, waiting for them to free and recycle any segments they were retaining</div> </li> </ul> <a name="sync(boolean)">  </a> <ul class="blockList"> <li class="blockList"> <h4>sync</h4> <pre>public void sync(boolean syncAllSegments)</pre> <div class="block">Forces a disk flush on the commit log files that need it. Blocking.</div> </li> </ul> <a name="requestExtraSync()">  </a> <ul class="blockList"> <li class="blockList"> <h4>requestExtraSync</h4> <pre>public void requestExtraSync()</pre> <div class="block">Preempts the CLExecutor, telling to to sync immediately</div> </li> </ul> <a name="add(org.apache.cassandra.db.Mutation)">  </a> <ul class="blockList"> <li class="blockList"> <h4>add</h4> <pre>public <a href="../../../../../org/apache/cassandra/db/commitlog/ReplayPosition.html" title="class in org.apache.cassandra.db.commitlog">ReplayPosition</a> add(<a href="../../../../../org/apache/cassandra/db/Mutation.html" title="class in org.apache.cassandra.db">Mutation</a> mutation)</pre> <div class="block">Add a Mutation to the commit log.</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>mutation</code> - the Mutation to add to the log</dd></dl> </li> </ul> <a name="discardCompletedSegments(java.util.UUID, org.apache.cassandra.db.commitlog.ReplayPosition)">  </a> <ul class="blockList"> <li class="blockList"> <h4>discardCompletedSegments</h4> <pre>public void discardCompletedSegments(java.util.UUID cfId, <a href="../../../../../org/apache/cassandra/db/commitlog/ReplayPosition.html" title="class in org.apache.cassandra.db.commitlog">ReplayPosition</a> context)</pre> <div class="block">Modifies the per-CF dirty cursors of any commit log segments for the column family according to the position given. Discards any commit log segments that are no longer used.</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>cfId</code> - the column family ID that was flushed</dd><dd><code>context</code> - the replay position of the flush</dd></dl> </li> </ul> <a name="getCompletedTasks()">  </a> <ul class="blockList"> <li class="blockList"> <h4>getCompletedTasks</h4> <pre>public long getCompletedTasks()</pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#getCompletedTasks()">CommitLogMBean</a></code></strong></div> <div class="block">Get the number of completed tasks</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#getCompletedTasks()">getCompletedTasks</a></code> in interface <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html" title="interface in org.apache.cassandra.db.commitlog">CommitLogMBean</a></code></dd> <dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/cassandra/metrics/CommitLogMetrics.html#completedTasks"><code>CommitLogMetrics.completedTasks</code></a></dd></dl> </li> </ul> <a name="getPendingTasks()">  </a> <ul class="blockList"> <li class="blockList"> <h4>getPendingTasks</h4> <pre>public long getPendingTasks()</pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#getPendingTasks()">CommitLogMBean</a></code></strong></div> <div class="block">Get the number of tasks waiting to be executed</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#getPendingTasks()">getPendingTasks</a></code> in interface <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html" title="interface in org.apache.cassandra.db.commitlog">CommitLogMBean</a></code></dd> <dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/cassandra/metrics/CommitLogMetrics.html#pendingTasks"><code>CommitLogMetrics.pendingTasks</code></a></dd></dl> </li> </ul> <a name="getTotalCommitlogSize()">  </a> <ul class="blockList"> <li class="blockList"> <h4>getTotalCommitlogSize</h4> <pre>public long getTotalCommitlogSize()</pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#getTotalCommitlogSize()">CommitLogMBean</a></code></strong></div> <div class="block">Get the current size used by all the commitlog segments.</div> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#getTotalCommitlogSize()">getTotalCommitlogSize</a></code> in interface <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html" title="interface in org.apache.cassandra.db.commitlog">CommitLogMBean</a></code></dd> <dt><span class="strong">Returns:</span></dt><dd>the total size occupied by commitlog segments expressed in bytes. (used by MBean)</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/cassandra/metrics/CommitLogMetrics.html#totalCommitLogSize"><code>CommitLogMetrics.totalCommitLogSize</code></a></dd></dl> </li> </ul> <a name="getActiveSegmentNames()">  </a> <ul class="blockList"> <li class="blockList"> <h4>getActiveSegmentNames</h4> <pre>public java.util.List<java.lang.String> getActiveSegmentNames()</pre> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#getActiveSegmentNames()">getActiveSegmentNames</a></code> in interface <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html" title="interface in org.apache.cassandra.db.commitlog">CommitLogMBean</a></code></dd> <dt><span class="strong">Returns:</span></dt><dd>file names (not full paths) of active commit log segments (segments containing unflushed data)</dd></dl> </li> </ul> <a name="getArchivingSegmentNames()">  </a> <ul class="blockList"> <li class="blockList"> <h4>getArchivingSegmentNames</h4> <pre>public java.util.List<java.lang.String> getArchivingSegmentNames()</pre> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html#getArchivingSegmentNames()">getArchivingSegmentNames</a></code> in interface <code><a href="../../../../../org/apache/cassandra/db/commitlog/CommitLogMBean.html" title="interface in org.apache.cassandra.db.commitlog">CommitLogMBean</a></code></dd> <dt><span class="strong">Returns:</span></dt><dd>Files which are pending for archival attempt. Does NOT include failed archive attempts.</dd></dl> </li> </ul> <a name="shutdownBlocking()">  </a> <ul class="blockList"> <li class="blockList"> <h4>shutdownBlocking</h4> <pre>public void shutdownBlocking() throws java.lang.InterruptedException</pre> <div class="block">Shuts down the threads used by the commit log, blocking until completion.</div> <dl><dt><span class="strong">Throws:</span></dt> <dd><code>java.lang.InterruptedException</code></dd></dl> </li> </ul> <a name="resetUnsafe()">  </a> <ul class="blockList"> <li class="blockList"> <h4>resetUnsafe</h4> <pre>public void resetUnsafe()</pre> <div class="block">FOR TESTING PURPOSES. 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