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<div class="subTitle">org.apache.hadoop.hbase.regionserver</div>
<h2 title="Class DefaultMemStore" class="title">Class DefaultMemStore</h2>
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<ul class="inheritance">
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<li><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">org.apache.hadoop.hbase.regionserver.AbstractMemStore</a></li>
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<li>org.apache.hadoop.hbase.regionserver.DefaultMemStore</li>
</ul>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStore.html" title="interface in org.apache.hadoop.hbase.regionserver">MemStore</a></dd>
</dl>
<hr>
<br>
<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.57">DefaultMemStore</a>
extends <a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">AbstractMemStore</a></pre>
<div class="block">The MemStore holds in-memory modifications to the Store. Modifications
are <a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase"><code>Cell</code></a>s. When asked to flush, current memstore is moved
to snapshot and is cleared. We continue to serve edits out of new memstore
and backing snapshot until flusher reports in that the flush succeeded. At
this point we let the snapshot go.
<p>
The MemStore functions should not be called in parallel. Callers should hold
write and read locks. This is done in <a href="../../../../../org/apache/hadoop/hbase/regionserver/HStore.html" title="class in org.apache.hadoop.hbase.regionserver"><code>HStore</code></a>.
</p>
TODO: Adjust size of the memstore when we remove items because they have
been deleted.
TODO: With new KVSLS, need to make sure we update HeapSize with difference
in KV size.</div>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</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>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#DEEP_OVERHEAD">DEEP_OVERHEAD</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#FIXED_OVERHEAD">FIXED_OVERHEAD</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#LOG">LOG</a></span></code>&nbsp;</td>
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<h3>Fields inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">AbstractMemStore</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#regionServices">regionServices</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#snapshot">snapshot</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#snapshotId">snapshotId</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<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/DefaultMemStore.html#DefaultMemStore--">DefaultMemStore</a></span>()</code>
<div class="block">Default constructor.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#DefaultMemStore-org.apache.hadoop.conf.Configuration-org.apache.hadoop.hbase.CellComparator-">DefaultMemStore</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf,
<a href="../../../../../org/apache/hadoop/hbase/CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;c)</code>
<div class="block">Constructor.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#DefaultMemStore-org.apache.hadoop.conf.Configuration-org.apache.hadoop.hbase.CellComparator-org.apache.hadoop.hbase.regionserver.RegionServicesForStores-">DefaultMemStore</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf,
<a href="../../../../../org/apache/hadoop/hbase/CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;c,
<a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionServicesForStores.html" title="class in org.apache.hadoop.hbase.regionserver">RegionServicesForStores</a>&nbsp;regionServices)</code>
<div class="block">Constructor.</div>
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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="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></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>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreSize.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreSize</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#getFlushableSize--">getFlushableSize</a></span>()</code>
<div class="block">Flush will first clear out the data in snapshot if any (It will take a second flush
invocation to clear the current Cell set).</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#getNextRow-org.apache.hadoop.hbase.Cell-">getNextRow</a></span>(<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell)</code>&nbsp;</td>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#getScanners-long-">getScanners</a></span>(long&nbsp;readPt)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/regionserver/Segment.html" title="class in org.apache.hadoop.hbase.regionserver">Segment</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#getSegments--">getSegments</a></span>()</code>&nbsp;</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>protected long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#heapSize--">heapSize</a></span>()</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#isSloppy--">isSloppy</a></span>()</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>protected long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#keySize--">keySize</a></span>()</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#main-java.lang.String:A-">main</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>[]&nbsp;args)</code>
<div class="block">Code to help figure if our approximation of object heap sizes is close
enough.</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#postUpdate-org.apache.hadoop.hbase.regionserver.MutableSegment-">postUpdate</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/MutableSegment.html" title="class in org.apache.hadoop.hbase.regionserver">MutableSegment</a>&nbsp;currentActive)</code>
<div class="block">Issue any post update synchronization and tests</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#preFlushSeqIDEstimation--">preFlushSeqIDEstimation</a></span>()</code>
<div class="block">This method is called before the flush is executed.</div>
</td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#preUpdate-org.apache.hadoop.hbase.regionserver.MutableSegment-org.apache.hadoop.hbase.Cell-org.apache.hadoop.hbase.regionserver.MemStoreSizing-">preUpdate</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/MutableSegment.html" title="class in org.apache.hadoop.hbase.regionserver">MutableSegment</a>&nbsp;currentActive,
<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell,
<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreSizing.html" title="interface in org.apache.hadoop.hbase.regionserver">MemStoreSizing</a>&nbsp;memstoreSizing)</code>
<div class="block">Issue any synchronization and test needed before applying the update</div>
</td>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreSize.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreSize</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#size--">size</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#sizeAddedPreOperation--">sizeAddedPreOperation</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreSnapshot.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreSnapshot</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#snapshot--">snapshot</a></span>()</code>
<div class="block">Creates a snapshot of the current memstore.</div>
</td>
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<tr id="i14" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#updateLowestUnflushedSequenceIdInWAL-boolean-">updateLowestUnflushedSequenceIdInWAL</a></span>(boolean&nbsp;onlyIfMoreRecent)</code>
<div class="block">Updates the wal with the lowest sequence id (oldest entry) that is still in memory</div>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">AbstractMemStore</a></h3>
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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>Methods inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStore.html" title="interface in org.apache.hadoop.hbase.regionserver">MemStore</a></h3>
<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStore.html#startReplayingFromWAL--">startReplayingFromWAL</a>, <a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStore.html#stopReplayingFromWAL--">stopReplayingFromWAL</a></code></li>
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<h4>LOG</h4>
<pre>private static final&nbsp;org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.58">LOG</a></pre>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.65">DefaultMemStore</a>()</pre>
<div class="block">Default constructor. Used for tests.</div>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.73">DefaultMemStore</a>(org.apache.hadoop.conf.Configuration&nbsp;conf,
<a href="../../../../../org/apache/hadoop/hbase/CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;c)</pre>
<div class="block">Constructor.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>c</code> - Comparator</dd>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.81">DefaultMemStore</a>(org.apache.hadoop.conf.Configuration&nbsp;conf,
<a href="../../../../../org/apache/hadoop/hbase/CellComparator.html" title="interface in org.apache.hadoop.hbase">CellComparator</a>&nbsp;c,
<a href="../../../../../org/apache/hadoop/hbase/regionserver/RegionServicesForStores.html" title="class in org.apache.hadoop.hbase.regionserver">RegionServicesForStores</a>&nbsp;regionServices)</pre>
<div class="block">Constructor.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>c</code> - Comparator</dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreSnapshot.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreSnapshot</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.91">snapshot</a>()</pre>
<div class="block">Creates a snapshot of the current memstore.
Snapshot must be cleared by call to <a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#clearSnapshot-long-"><code>AbstractMemStore.clearSnapshot(long)</code></a></div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreSnapshot.html" title="class in org.apache.hadoop.hbase.regionserver"><code>MemStoreSnapshot</code></a></dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreSize.html" title="class in org.apache.hadoop.hbase.regionserver">MemStoreSize</a>&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.119">getFlushableSize</a>()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStore.html#getFlushableSize--">MemStore</a></code></span></div>
<div class="block">Flush will first clear out the data in snapshot if any (It will take a second flush
invocation to clear the current Cell set). If snapshot is empty, current
Cell set will be flushed.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>On flush, how much memory we will clear.</dd>
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<pre>protected&nbsp;long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.125">keySize</a>()</pre>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#keySize--">keySize</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">AbstractMemStore</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The total size of cells in this memstore. We will not consider cells in the snapshot</dd>
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<pre>protected&nbsp;long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.130">heapSize</a>()</pre>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#heapSize--">heapSize</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">AbstractMemStore</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The total heap size of cells in this memstore. We will not consider cells in the
snapshot</dd>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/regionserver/KeyValueScanner.html" title="interface in org.apache.hadoop.hbase.regionserver">KeyValueScanner</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.138">getScanners</a>(long&nbsp;readPt)
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>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>scanner over the memstore. This might include scanner over the snapshot when one is
present.</dd>
<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>protected&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/regionserver/Segment.html" title="class in org.apache.hadoop.hbase.regionserver">Segment</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.146">getSegments</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>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#getSegments--">getSegments</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">AbstractMemStore</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an ordered list of segments from most recent to oldest in memstore</dd>
<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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<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cell</code> - Find the row that comes after this one. If null, we return the
first.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Next row or null if none found.</dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.165">updateLowestUnflushedSequenceIdInWAL</a>(boolean&nbsp;onlyIfMoreRecent)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#updateLowestUnflushedSequenceIdInWAL-boolean-">AbstractMemStore</a></code></span></div>
<div class="block">Updates the wal with the lowest sequence id (oldest entry) that is still in memory</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#updateLowestUnflushedSequenceIdInWAL-boolean-">updateLowestUnflushedSequenceIdInWAL</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">AbstractMemStore</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>onlyIfMoreRecent</code> - a flag that marks whether to update the sequence id no matter what or
only if it is greater than the previous sequence id</dd>
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<a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell,
<a href="../../../../../org/apache/hadoop/hbase/regionserver/MemStoreSizing.html" title="interface in org.apache.hadoop.hbase.regionserver">MemStoreSizing</a>&nbsp;memstoreSizing)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#preUpdate-org.apache.hadoop.hbase.regionserver.MutableSegment-org.apache.hadoop.hbase.Cell-org.apache.hadoop.hbase.regionserver.MemStoreSizing-">AbstractMemStore</a></code></span></div>
<div class="block">Issue any synchronization and test needed before applying the update</div>
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<dd><code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html#preUpdate-org.apache.hadoop.hbase.regionserver.MutableSegment-org.apache.hadoop.hbase.Cell-org.apache.hadoop.hbase.regionserver.MemStoreSizing-">preUpdate</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/regionserver/AbstractMemStore.html" title="class in org.apache.hadoop.hbase.regionserver">AbstractMemStore</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>currentActive</code> - the segment to be updated</dd>
<dd><code>cell</code> - the cell to be added</dd>
<dd><code>memstoreSizing</code> - object to accumulate region size changes</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true iff can proceed with applying the update</dd>
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<div class="block">Issue any post update synchronization and tests</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>currentActive</code> - updated segment</dd>
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<pre>protected&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.180">sizeAddedPreOperation</a>()</pre>
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<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Total memory occupied by this MemStore. This won't include any size occupied by the
snapshot. We assume the snapshot will get cleared soon. This is not thread safe and
the memstore may be changed while computing its size. It is the responsibility of the
caller to make sure this doesn't happen.</dd>
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<div class="block">This method is called before the flush is executed.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an estimation (lower bound) of the unflushed sequence id in memstore after the flush
is executed. if memstore will be cleared returns <code>HConstants.NO_SEQNUM</code>.</dd>
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<pre>public static&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/DefaultMemStore.html#line.206">main</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>[]&nbsp;args)</pre>
<div class="block">Code to help figure if our approximation of object heap sizes is close
enough. See hbase-900. Fills memstores then waits so user can heap
dump and bring up resultant hprof in something like jprofiler which
allows you get 'deep size' on objects.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>args</code> - main args</dd>
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