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>SizeTieredCompactionStrategy (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/SizeTieredCompactionStrategy.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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class="inheritance"> <li>org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy</li> </ul> </li> </ul> </li> </ul> <div class="description"> <ul class="blockList"> <li class="blockList"> <hr> <br> <pre>public class <span class="strong">SizeTieredCompactionStrategy</span> extends <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionStrategy</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>protected int</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#estimatedRemainingTasks">estimatedRemainingTasks</a></strong></code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>protected <a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategyOptions.html" title="class in org.apache.cassandra.db.compaction">SizeTieredCompactionStrategyOptions</a></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#options">options</a></strong></code> </td> </tr> </table> <ul class="blockList"> <li class="blockList"><a name="fields_inherited_from_class_org.apache.cassandra.db.compaction.AbstractCompactionStrategy">  </a> <h3>Fields inherited from class org.apache.cassandra.db.compaction.<a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionStrategy</a></h3> <code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#cfs">cfs</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#COMPACTION_ENABLED">COMPACTION_ENABLED</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#DEFAULT_TOMBSTONE_COMPACTION_INTERVAL">DEFAULT_TOMBSTONE_COMPACTION_INTERVAL</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#DEFAULT_TOMBSTONE_THRESHOLD">DEFAULT_TOMBSTONE_THRESHOLD</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#DEFAULT_UNCHECKED_TOMBSTONE_COMPACTION_OPTION">DEFAULT_UNCHECKED_TOMBSTONE_COMPACTION_OPTION</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#enabled">enabled</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#isActive">isActive</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#TOMBSTONE_COMPACTION_INTERVAL_OPTION">TOMBSTONE_COMPACTION_INTERVAL_OPTION</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#TOMBSTONE_THRESHOLD_OPTION">TOMBSTONE_THRESHOLD_OPTION</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#tombstoneCompactionInterval">tombstoneCompactionInterval</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#tombstoneThreshold">tombstoneThreshold</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#UNCHECKED_TOMBSTONE_COMPACTION_OPTION">UNCHECKED_TOMBSTONE_COMPACTION_OPTION</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#uncheckedTombstoneCompaction">uncheckedTombstoneCompaction</a></code></li> </ul> </li> </ul>  <ul class="blockList"> <li class="blockList"><a name="constructor_summary">  </a> <h3>Constructor Summary</h3> <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> <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><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#SizeTieredCompactionStrategy(org.apache.cassandra.db.ColumnFamilyStore,%20java.util.Map)">SizeTieredCompactionStrategy</a></strong>(<a href="../../../../../org/apache/cassandra/db/ColumnFamilyStore.html" title="class in org.apache.cassandra.db">ColumnFamilyStore</a> cfs, java.util.Map<java.lang.String,java.lang.String> options)</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>static java.util.List<<a href="../../../../../org/apache/cassandra/utils/Pair.html" title="class in org.apache.cassandra.utils">Pair</a><<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>,java.lang.Long>></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#createSSTableAndLengthPairs(java.lang.Iterable)">createSSTableAndLengthPairs</a></strong>(java.lang.Iterable<<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>> sstables)</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static <T> java.util.List<java.util.List<T>></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#getBuckets(java.util.Collection,%20double,%20double,%20long)">getBuckets</a></strong>(java.util.Collection<<a href="../../../../../org/apache/cassandra/utils/Pair.html" title="class in org.apache.cassandra.utils">Pair</a><T,java.lang.Long>> files, double bucketHigh, double bucketLow, long minSSTableSize)</code> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>int</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#getEstimatedRemainingTasks()">getEstimatedRemainingTasks</a></strong>()</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>java.util.Collection<<a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionTask.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionTask</a>></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#getMaximalTask(int)">getMaximalTask</a></strong>(int gcBefore)</code> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>long</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#getMaxSSTableBytes()">getMaxSSTableBytes</a></strong>()</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionTask.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionTask</a></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#getNextBackgroundTask(int)">getNextBackgroundTask</a></strong>(int gcBefore)</code> </td> </tr> <tr class="altColor"> <td class="colFirst"><code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionTask.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionTask</a></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#getUserDefinedTask(java.util.Collection,%20int)">getUserDefinedTask</a></strong>(java.util.Collection<<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>> sstables, int gcBefore)</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static java.util.List<<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#mostInterestingBucket(java.util.List,%20int,%20int)">mostInterestingBucket</a></strong>(java.util.List<java.util.List<<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>>> buckets, int minThreshold, int maxThreshold)</code> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>java.lang.String</code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#toString()">toString</a></strong>()</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static java.util.Map<java.lang.String,java.lang.String></code></td> <td class="colLast"><code><strong><a href="../../../../../org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.html#validateOptions(java.util.Map)">validateOptions</a></strong>(java.util.Map<java.lang.String,java.lang.String> options)</code> </td> </tr> </table> <ul class="blockList"> <li class="blockList"><a name="methods_inherited_from_class_org.apache.cassandra.db.compaction.AbstractCompactionStrategy">  </a> <h3>Methods inherited from class org.apache.cassandra.db.compaction.<a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionStrategy</a></h3> <code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#disable()">disable</a>, <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#enable()">enable</a>, <a 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title="class in org.apache.cassandra.db.compaction">SizeTieredCompactionStrategyOptions</a> options</pre> </li> </ul> <a name="estimatedRemainingTasks">  </a> <ul class="blockListLast"> <li class="blockList"> <h4>estimatedRemainingTasks</h4> <pre>protected volatile int estimatedRemainingTasks</pre> </li> </ul> </li> </ul>  <ul class="blockList"> <li class="blockList"><a name="constructor_detail">  </a> <h3>Constructor Detail</h3> <a name="SizeTieredCompactionStrategy(org.apache.cassandra.db.ColumnFamilyStore, java.util.Map)">  </a> <ul class="blockListLast"> <li class="blockList"> <h4>SizeTieredCompactionStrategy</h4> <pre>public SizeTieredCompactionStrategy(<a href="../../../../../org/apache/cassandra/db/ColumnFamilyStore.html" title="class in org.apache.cassandra.db">ColumnFamilyStore</a> cfs, java.util.Map<java.lang.String,java.lang.String> options)</pre> </li> </ul> </li> </ul>  <ul class="blockList"> <li class="blockList"><a name="method_detail">  </a> <h3>Method Detail</h3> <a name="mostInterestingBucket(java.util.List, int, int)">  </a> <ul class="blockList"> <li class="blockList"> <h4>mostInterestingBucket</h4> <pre>public static java.util.List<<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>> mostInterestingBucket(java.util.List<java.util.List<<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>>> buckets, int minThreshold, int maxThreshold)</pre> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>buckets</code> - list of buckets from which to return the most interesting, where "interesting" is the total hotness for reads</dd><dd><code>minThreshold</code> - minimum number of sstables in a bucket to qualify as interesting</dd><dd><code>maxThreshold</code> - maximum number of sstables to compact at once (the returned bucket will be trimmed down to this)</dd> <dt><span class="strong">Returns:</span></dt><dd>a bucket (list) of sstables to compact</dd></dl> </li> </ul> <a name="getNextBackgroundTask(int)">  </a> <ul class="blockList"> <li class="blockList"> <h4>getNextBackgroundTask</h4> <pre>public <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionTask.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionTask</a> getNextBackgroundTask(int gcBefore)</pre> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#getNextBackgroundTask(int)">getNextBackgroundTask</a></code> in class <code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionStrategy</a></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>gcBefore</code> - throw away tombstones older than this</dd> <dt><span class="strong">Returns:</span></dt><dd>the next background/minor compaction task to run; null if nothing to do. Is responsible for marking its sstables as compaction-pending.</dd></dl> </li> </ul> <a name="getMaximalTask(int)">  </a> <ul class="blockList"> <li class="blockList"> <h4>getMaximalTask</h4> <pre>public java.util.Collection<<a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionTask.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionTask</a>> getMaximalTask(int gcBefore)</pre> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#getMaximalTask(int)">getMaximalTask</a></code> in class <code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionStrategy</a></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>gcBefore</code> - throw away tombstones older than this</dd> <dt><span class="strong">Returns:</span></dt><dd>a compaction task that should be run to compact this columnfamilystore as much as possible. Null if nothing to do. Is responsible for marking its sstables as compaction-pending.</dd></dl> </li> </ul> <a name="getUserDefinedTask(java.util.Collection, int)">  </a> <ul class="blockList"> <li class="blockList"> <h4>getUserDefinedTask</h4> <pre>public <a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionTask.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionTask</a> getUserDefinedTask(java.util.Collection<<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>> sstables, int gcBefore)</pre> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#getUserDefinedTask(java.util.Collection,%20int)">getUserDefinedTask</a></code> in class <code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionStrategy</a></code></dd> <dt><span class="strong">Parameters:</span></dt><dd><code>sstables</code> - SSTables to compact. Must be marked as compacting.</dd><dd><code>gcBefore</code> - throw away tombstones older than this</dd> <dt><span class="strong">Returns:</span></dt><dd>a compaction task corresponding to the requested sstables. Will not be null. (Will throw if user requests an invalid compaction.) Is responsible for marking its sstables as compaction-pending.</dd></dl> </li> </ul> <a name="getEstimatedRemainingTasks()">  </a> <ul class="blockList"> <li class="blockList"> <h4>getEstimatedRemainingTasks</h4> <pre>public int getEstimatedRemainingTasks()</pre> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#getEstimatedRemainingTasks()">getEstimatedRemainingTasks</a></code> in class <code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionStrategy</a></code></dd> <dt><span class="strong">Returns:</span></dt><dd>the number of background tasks estimated to still be needed for this columnfamilystore</dd></dl> </li> </ul> <a name="createSSTableAndLengthPairs(java.lang.Iterable)">  </a> <ul class="blockList"> <li class="blockList"> <h4>createSSTableAndLengthPairs</h4> <pre>public static java.util.List<<a href="../../../../../org/apache/cassandra/utils/Pair.html" title="class in org.apache.cassandra.utils">Pair</a><<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>,java.lang.Long>> createSSTableAndLengthPairs(java.lang.Iterable<<a href="../../../../../org/apache/cassandra/io/sstable/SSTableReader.html" title="class in org.apache.cassandra.io.sstable">SSTableReader</a>> sstables)</pre> </li> </ul> <a name="getBuckets(java.util.Collection, double, double, long)">  </a> <ul class="blockList"> <li class="blockList"> <h4>getBuckets</h4> <pre>public static <T> java.util.List<java.util.List<T>> getBuckets(java.util.Collection<<a href="../../../../../org/apache/cassandra/utils/Pair.html" title="class in org.apache.cassandra.utils">Pair</a><T,java.lang.Long>> files, double bucketHigh, double bucketLow, long minSSTableSize)</pre> </li> </ul> <a name="getMaxSSTableBytes()">  </a> <ul class="blockList"> <li class="blockList"> <h4>getMaxSSTableBytes</h4> <pre>public long getMaxSSTableBytes()</pre> <dl> <dt><strong>Specified by:</strong></dt> <dd><code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html#getMaxSSTableBytes()">getMaxSSTableBytes</a></code> in class <code><a href="../../../../../org/apache/cassandra/db/compaction/AbstractCompactionStrategy.html" title="class in org.apache.cassandra.db.compaction">AbstractCompactionStrategy</a></code></dd> <dt><span class="strong">Returns:</span></dt><dd>size in bytes of the largest sstables for this strategy</dd></dl> </li> </ul> <a name="validateOptions(java.util.Map)">  </a> <ul class="blockList"> <li class="blockList"> <h4>validateOptions</h4> <pre>public static java.util.Map<java.lang.String,java.lang.String> validateOptions(java.util.Map<java.lang.String,java.lang.String> options) throws <a href="../../../../../org/apache/cassandra/exceptions/ConfigurationException.html" title="class in org.apache.cassandra.exceptions">ConfigurationException</a></pre> <dl><dt><span class="strong">Throws:</span></dt> <dd><code><a href="../../../../../org/apache/cassandra/exceptions/ConfigurationException.html" title="class in org.apache.cassandra.exceptions">ConfigurationException</a></code></dd></dl> </li> </ul> <a name="toString()">  </a> <ul class="blockListLast"> <li class="blockList"> <h4>toString</h4> <pre>public java.lang.String toString()</pre> <dl> <dt><strong>Overrides:</strong></dt> <dd><code>toString</code> in class <code>java.lang.Object</code></dd> </dl> </li> </ul> </li> </ul> </li> </ul> </div> </div>   <div class="bottomNav"><a name="navbar_bottom">  </a><a href="#skip-navbar_bottom" title="Skip navigation links"></a><a name="navbar_bottom_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> 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