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<h2 title="Class BBKVComparator" class="title">Class BBKVComparator</h2>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../src-html/org/apache/hadoop/hbase/BBKVComparator.html#line.64">BBKVComparator</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="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a></pre>
<div class="block">A comparator for case where <a href="../../../../org/apache/hadoop/hbase/ByteBufferKeyValue.html" title="class in org.apache.hadoop.hbase"><code>ByteBufferKeyValue</code></a> is prevalent type (BBKV
is base-type in hbase2). Takes a general comparator as fallback in case types are NOT the
expected ByteBufferKeyValue.
<p>This is a tricked-out Comparator at heart of hbase read and write. It is in
the HOT path so we try all sorts of ugly stuff so we can go faster. See below
in this javadoc comment for the list.
<p>Apply this comparator narrowly so it is fed exclusively ByteBufferKeyValues
as much as is possible so JIT can settle (e.g. make one per ConcurrentSkipListMap
in HStore).
<p>Exploits specially added methods in BBKV to save on deserializations of shorts,
longs, etc: i.e. calculating the family length requires row length; pass it in
rather than recalculate it, and so on.
<p>This comparator does static dispatch to private final methods so hotspot is comfortable
deciding inline.
<p>Measurement has it that we almost have it so all inlines from memstore
ConcurrentSkipListMap on down to the (unsafe) intrinisics that do byte compare
and deserialize shorts and ints; needs a bit more work.
<p>Does not take a Type to compare: i.e. it is not a Comparator&lt;Cell> or
CellComparator&lt;Cell> or Comparator&lt;ByteBufferKeyValue> because that adds
another method to the hierarchy -- from compare(Object, Object)
to dynamic compare(Cell, Cell) to static private compare -- and inlining doesn't happen if
hierarchy is too deep (it is the case here).
<p>Be careful making changes. Compare perf before and after and look at what
hotspot ends up generating before committing change (jitwatch is helpful here).
Changing this one class doubled write throughput (HBASE-20483).</div>
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<td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/BBKVComparator.html#fallback">fallback</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>protected static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/BBKVComparator.html#LOG">LOG</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/BBKVComparator.html#BBKVComparator-java.util.Comparator-">BBKVComparator</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a>&nbsp;fallback)</code>&nbsp;</td>
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<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/BBKVComparator.html#compare-org.apache.hadoop.hbase.ByteBufferKeyValue-org.apache.hadoop.hbase.ByteBufferKeyValue-boolean-">compare</a></span>(<a href="../../../../org/apache/hadoop/hbase/ByteBufferKeyValue.html" title="class in org.apache.hadoop.hbase">ByteBufferKeyValue</a>&nbsp;left,
<a href="../../../../org/apache/hadoop/hbase/ByteBufferKeyValue.html" title="class in org.apache.hadoop.hbase">ByteBufferKeyValue</a>&nbsp;right,
boolean&nbsp;ignoreSequenceid)</code>&nbsp;</td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/BBKVComparator.html#compare-java.lang.Object-java.lang.Object-">compare</a></span>(<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>&nbsp;l,
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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#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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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparing-java.util.function.Function-" title="class or interface in java.util">comparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparing-java.util.function.Function-java.util.Comparator-" title="class or interface in java.util">comparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparingDouble-java.util.function.ToDoubleFunction-" title="class or interface in java.util">comparingDouble</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparingInt-java.util.function.ToIntFunction-" title="class or interface in java.util">comparingInt</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparingLong-java.util.function.ToLongFunction-" title="class or interface in java.util">comparingLong</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.util">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#naturalOrder--" title="class or interface in java.util">naturalOrder</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#nullsFirst-java.util.Comparator-" title="class or interface in java.util">nullsFirst</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#nullsLast-java.util.Comparator-" title="class or interface in java.util">nullsLast</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#reversed--" title="class or interface in java.util">reversed</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#reverseOrder--" title="class or interface in java.util">reverseOrder</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.Comparator-" title="class or interface in java.util">thenComparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.function.Function-" title="class or interface in java.util">thenComparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.function.Function-java.util.Comparator-" title="class or interface in java.util">thenComparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparingDouble-java.util.function.ToDoubleFunction-" title="class or interface in java.util">thenComparingDouble</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparingInt-java.util.function.ToIntFunction-" title="class or interface in java.util">thenComparingInt</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparingLong-java.util.function.ToLongFunction-" title="class or interface in java.util">thenComparingLong</a></code></li>
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<pre>protected static final&nbsp;org.slf4j.Logger <a href="../../../../src-html/org/apache/hadoop/hbase/BBKVComparator.html#line.65">LOG</a></pre>
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<pre>private final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a> <a href="../../../../src-html/org/apache/hadoop/hbase/BBKVComparator.html#line.66">fallback</a></pre>
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<pre>public&nbsp;<a href="../../../../src-html/org/apache/hadoop/hbase/BBKVComparator.html#line.68">BBKVComparator</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a>&nbsp;fallback)</pre>
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<pre>public&nbsp;int&nbsp;<a href="../../../../src-html/org/apache/hadoop/hbase/BBKVComparator.html#line.73">compare</a>(<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>&nbsp;l,
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<pre>static final&nbsp;int&nbsp;<a href="../../../../src-html/org/apache/hadoop/hbase/BBKVComparator.html#line.84">compare</a>(<a href="../../../../org/apache/hadoop/hbase/ByteBufferKeyValue.html" title="class in org.apache.hadoop.hbase">ByteBufferKeyValue</a>&nbsp;left,
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boolean&nbsp;ignoreSequenceid)</pre>
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