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| <div class="subTitle">org.apache.hadoop.hbase.regionserver</div> |
| <h2 title="Class AdaptiveMemStoreCompactionStrategy" class="title">Class AdaptiveMemStoreCompactionStrategy</h2> |
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| <ul class="inheritance"> |
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| <li><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.MemStoreCompactionStrategy</a></li> |
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| <ul class="inheritance"> |
| <li>org.apache.hadoop.hbase.regionserver.AdaptiveMemStoreCompactionStrategy</li> |
| </ul> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#line.43">AdaptiveMemStoreCompactionStrategy</a> |
| extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreCompactionStrategy</a></pre> |
| <div class="block">Adaptive is a heuristic that chooses whether to apply data compaction or not based on the |
| level of redundancy in the data. Adaptive triggers redundancy elimination only for those |
| stores where positive impact is expected. |
| |
| Adaptive uses two parameters to determine whether to perform redundancy elimination. |
| The first parameter, u, estimates the ratio of unique keys in the memory store based on the |
| fraction of unique keys encountered during the previous merge of segment indices. |
| The second is the perceived probability (compactionProbability) that the store can benefit from |
| redundancy elimination. Initially, compactionProbability=0.5; it then grows exponentially by |
| 2% whenever a compaction is successful and decreased by 2% whenever a compaction did not meet |
| the expectation. It is reset back to the default value (namely 0.5) upon disk flush. |
| |
| Adaptive triggers redundancy elimination with probability compactionProbability if the |
| fraction of redundant keys 1-u exceeds a parameter threshold compactionThreshold.</div> |
| </li> |
| </ul> |
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| <h3>Nested classes/interfaces inherited from class org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreCompactionStrategy</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.Action.html" title="enum in org.apache.hadoop.hbase.regionserver">MemStoreCompactionStrategy.Action</a></code></li> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" 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>private static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#ADAPTIVE_COMPACTION_THRESHOLD_DEFAULT">ADAPTIVE_COMPACTION_THRESHOLD_DEFAULT</a></span></code> </td> |
| </tr> |
| <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/AdaptiveMemStoreCompactionStrategy.html#ADAPTIVE_COMPACTION_THRESHOLD_KEY">ADAPTIVE_COMPACTION_THRESHOLD_KEY</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#ADAPTIVE_INITIAL_COMPACTION_PROBABILITY_DEFAULT">ADAPTIVE_INITIAL_COMPACTION_PROBABILITY_DEFAULT</a></span></code> </td> |
| </tr> |
| <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/AdaptiveMemStoreCompactionStrategy.html#ADAPTIVE_INITIAL_COMPACTION_PROBABILITY_KEY">ADAPTIVE_INITIAL_COMPACTION_PROBABILITY_KEY</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#ADAPTIVE_PROBABILITY_FACTOR">ADAPTIVE_PROBABILITY_FACTOR</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#compacted">compacted</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#compactionProbability">compactionProbability</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#compactionThreshold">compactionThreshold</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#initialCompactionProbability">initialCompactionProbability</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private 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/AdaptiveMemStoreCompactionStrategy.html#NAME">NAME</a></span></code> </td> |
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| <td class="colFirst"><code>private double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#numCellsInVersionedList">numCellsInVersionedList</a></span></code> </td> |
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| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Random.html?is-external=true" title="class or interface in java.util">Random</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#rand">rand</a></span></code> </td> |
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| <h3>Fields inherited from class org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreCompactionStrategy</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html#cfName">cfName</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html#COMPACTING_MEMSTORE_THRESHOLD_DEFAULT">COMPACTING_MEMSTORE_THRESHOLD_DEFAULT</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html#COMPACTING_MEMSTORE_THRESHOLD_KEY">COMPACTING_MEMSTORE_THRESHOLD_KEY</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html#LOG">LOG</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html#pipelineThreshold">pipelineThreshold</a></code></li> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#AdaptiveMemStoreCompactionStrategy-org.apache.hadoop.conf.Configuration-java.lang.String-">AdaptiveMemStoreCompactionStrategy</a></span>(org.apache.hadoop.conf.Configuration conf, |
| <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> cfName)</code> </td> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.Action.html" title="enum in org.apache.hadoop.hbase.regionserver">MemStoreCompactionStrategy.Action</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#getAction-org.apache.hadoop.hbase.regionserver.VersionedSegmentsList-">getAction</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/VersionedSegmentsList.html" title="class in org.apache.hadoop.hbase.regionserver">VersionedSegmentsList</a> versionedList)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.Action.html" title="enum in org.apache.hadoop.hbase.regionserver">MemStoreCompactionStrategy.Action</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#getFlattenAction--">getFlattenAction</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.Action.html" title="enum in org.apache.hadoop.hbase.regionserver">MemStoreCompactionStrategy.Action</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#getMergingAction--">getMergingAction</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected <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/AdaptiveMemStoreCompactionStrategy.html#getName--">getName</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#resetStats--">resetStats</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#updateStats-org.apache.hadoop.hbase.regionserver.Segment-">updateStats</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/Segment.html" title="class in org.apache.hadoop.hbase.regionserver">Segment</a> replacement)</code> </td> |
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| <h3>Methods inherited from class org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreCompactionStrategy</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html#compact-org.apache.hadoop.hbase.regionserver.VersionedSegmentsList-java.lang.String-">compact</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html#simpleMergeOrFlatten-org.apache.hadoop.hbase.regionserver.VersionedSegmentsList-java.lang.String-">simpleMergeOrFlatten</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreCompactionStrategy.html#toString--">toString</a></code></li> |
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| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| <h3>Field Detail</h3> |
| <a name="NAME"> |
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| <h4>NAME</h4> |
| <pre>private 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/AdaptiveMemStoreCompactionStrategy.html#line.44">NAME</a></pre> |
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| <h4>ADAPTIVE_COMPACTION_THRESHOLD_KEY</h4> |
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| <h4>ADAPTIVE_COMPACTION_THRESHOLD_DEFAULT</h4> |
| <pre>private static final double <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/AdaptiveMemStoreCompactionStrategy.html#line.47">ADAPTIVE_COMPACTION_THRESHOLD_DEFAULT</a></pre> |
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