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<div class="subTitle">org.apache.hadoop.hbase.coprocessor.example</div>
<h2 title="Class ValueRewritingObserver" class="title">Class ValueRewritingObserver</h2>
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<li>org.apache.hadoop.hbase.coprocessor.example.ValueRewritingObserver</li>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html" title="interface in org.apache.hadoop.hbase">Coprocessor</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionCoprocessor</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a></dd>
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<br>
<pre>@InterfaceAudience.Private
public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#line.45">ValueRewritingObserver</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>
implements <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionCoprocessor</a></pre>
<div class="block">This RegionObserver replaces the values of Puts from one value to another on compaction.</div>
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<li class="blockList"><a name="nested.classes.inherited.from.class.org.apache.hadoop.hbase.coprocessor.RegionObserver">
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</a>
<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.hadoop.hbase.coprocessor.<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a></h3>
<code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.MutationType.html" title="enum in org.apache.hadoop.hbase.coprocessor">RegionObserver.MutationType</a></code></li>
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<ul class="blockList">
<li class="blockList"><a name="nested.classes.inherited.from.class.org.apache.hadoop.hbase.Coprocessor">
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<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.hadoop.hbase.<a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html" title="interface in org.apache.hadoop.hbase">Coprocessor</a></h3>
<code><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.State.html" title="enum in org.apache.hadoop.hbase">Coprocessor.State</a></code></li>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/CellBuilder.html" title="interface in org.apache.hadoop.hbase">CellBuilder</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#cellBuilder">cellBuilder</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/util/Bytes.ByteArrayComparator.html" title="class in org.apache.hadoop.hbase.util">Bytes.ByteArrayComparator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#comparator">comparator</a></span></code>&nbsp;</td>
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<tr 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/coprocessor/example/ValueRewritingObserver.html#ORIGINAL_VALUE_KEY">ORIGINAL_VALUE_KEY</a></span></code>&nbsp;</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/coprocessor/example/ValueRewritingObserver.html#REPLACED_VALUE_KEY">REPLACED_VALUE_KEY</a></span></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>private byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#replacedValue">replacedValue</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#sourceValue">sourceValue</a></span></code>&nbsp;</td>
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<h3>Fields inherited from interface&nbsp;org.apache.hadoop.hbase.<a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html" title="interface in org.apache.hadoop.hbase">Coprocessor</a></h3>
<code><a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#PRIORITY_HIGHEST">PRIORITY_HIGHEST</a>, <a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#PRIORITY_LOWEST">PRIORITY_LOWEST</a>, <a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#PRIORITY_SYSTEM">PRIORITY_SYSTEM</a>, <a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#PRIORITY_USER">PRIORITY_USER</a>, <a href="../../../../../../org/apache/hadoop/hbase/Coprocessor.html#VERSION">VERSION</a></code></li>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#ValueRewritingObserver--">ValueRewritingObserver</a></span>()</code>&nbsp;</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">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</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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<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#getRegionObserver--">getRegionObserver</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#preCompact-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.Store-org.apache.hadoop.hbase.regionserver.InternalScanner-org.apache.hadoop.hbase.regionserver.ScanType-org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker-org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest-">preCompact</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ObserverContext.html" title="interface in org.apache.hadoop.hbase.coprocessor">ObserverContext</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionCoprocessorEnvironment</a>&gt;&nbsp;c,
<a href="../../../../../../org/apache/hadoop/hbase/regionserver/Store.html" title="interface in org.apache.hadoop.hbase.regionserver">Store</a>&nbsp;store,
<a href="../../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">InternalScanner</a>&nbsp;scanner,
<a href="../../../../../../org/apache/hadoop/hbase/regionserver/ScanType.html" title="enum in org.apache.hadoop.hbase.regionserver">ScanType</a>&nbsp;scanType,
<a href="../../../../../../org/apache/hadoop/hbase/regionserver/compactions/CompactionLifeCycleTracker.html" title="interface in org.apache.hadoop.hbase.regionserver.compactions">CompactionLifeCycleTracker</a>&nbsp;tracker,
<a href="../../../../../../org/apache/hadoop/hbase/regionserver/compactions/CompactionRequest.html" title="interface in org.apache.hadoop.hbase.regionserver.compactions">CompactionRequest</a>&nbsp;request)</code>
<div class="block">Called prior to writing the <a href="../../../../../../org/apache/hadoop/hbase/regionserver/StoreFile.html" title="interface in org.apache.hadoop.hbase.regionserver"><code>StoreFile</code></a>s selected for compaction into a new
<code>StoreFile</code>.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/example/ValueRewritingObserver.html#start-org.apache.hadoop.hbase.CoprocessorEnvironment-">start</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase">CoprocessorEnvironment</a>&nbsp;env)</code>
<div class="block">Called by the <a href="../../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase"><code>CoprocessorEnvironment</code></a> during it's own startup to initialize the
coprocessor.</div>
</td>
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<h3>Methods inherited from class&nbsp;java.lang.<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></h3>
<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#toString--" title="class or interface in java.lang">toString</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>Methods inherited from interface&nbsp;org.apache.hadoop.hbase.coprocessor.<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a></h3>
<code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#postAppend-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.client.Append-org.apache.hadoop.hbase.client.Result-">postAppend</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#postAppendBeforeWAL-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.client.Mutation-java.util.List-">postAppendBeforeWAL</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#postBatchMutate-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.MiniBatchOperationInProgress-">postBatchMutate</a>, <a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#postBatchMutateIndispensably-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.MiniBatchOperationInProgress-boolean-">postBatchMutateIndispensably</a>, <a 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<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html#preCompact-org.apache.hadoop.hbase.coprocessor.ObserverContext-org.apache.hadoop.hbase.regionserver.Store-org.apache.hadoop.hbase.regionserver.InternalScanner-org.apache.hadoop.hbase.regionserver.ScanType-org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker-org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest-">preCompact</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/coprocessor/RegionObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor">RegionObserver</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>c</code> - the environment provided by the region server</dd>
<dd><code>store</code> - the store being compacted</dd>
<dd><code>scanner</code> - the scanner over existing data used in the store file rewriting</dd>
<dd><code>scanType</code> - type of Scan</dd>
<dd><code>tracker</code> - tracker used to track the life cycle of a compaction</dd>
<dd><code>request</code> - the requested compaction</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the scanner to use during compaction. Should not be <code>null</code> unless the
implementation is writing new store files on its own.</dd>
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