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<div class="subTitle">org.apache.spark.serializer</div>
<h2 title="Class KryoSerializer" class="title">Class KryoSerializer</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="strong">KryoSerializer</span>
extends <a href="../../../../org/apache/spark/serializer/Serializer.html" title="class in org.apache.spark.serializer">Serializer</a>
implements <a href="../../../../org/apache/spark/Logging.html" title="interface in org.apache.spark">Logging</a>, scala.Serializable</pre>
<div class="block">A Spark serializer that uses the <code>Kryo serialization library</code>.
<p>
Note that this serializer is not guaranteed to be wire-compatible across different versions of
Spark. It is intended to be used to serialize/de-serialize data within a single
Spark application.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../serialized-form.html#org.apache.spark.serializer.KryoSerializer">Serialized Form</a></dd></dl>
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<td class="colOne"><code><strong><a href="../../../../org/apache/spark/serializer/KryoSerializer.html#KryoSerializer(org.apache.spark.SparkConf)">KryoSerializer</a></strong>(<a href="../../../../org/apache/spark/SparkConf.html" title="class in org.apache.spark">SparkConf</a> conf)</code> </td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/spark/serializer/KryoSerializer.html#maxBufferSizeMb()">maxBufferSizeMb</a></strong>()</code> </td>
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<td class="colFirst"><code><a href="../../../../org/apache/spark/serializer/SerializerInstance.html" title="class in org.apache.spark.serializer">SerializerInstance</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/spark/serializer/KryoSerializer.html#newInstance()">newInstance</a></strong>()</code>
<div class="block">Creates a new <a href="../../../../org/apache/spark/serializer/SerializerInstance.html" title="class in org.apache.spark.serializer"><code>SerializerInstance</code></a>.</div>
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<td class="colFirst"><code>com.esotericsoftware.kryo.Kryo</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/spark/serializer/KryoSerializer.html#newKryo()">newKryo</a></strong>()</code> </td>
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<td class="colFirst"><code>com.esotericsoftware.kryo.io.Output</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/spark/serializer/KryoSerializer.html#newKryoOutput()">newKryoOutput</a></strong>()</code> </td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/spark/serializer/KryoSerializer.html#supportsRelocationOfSerializedObjects()">supportsRelocationOfSerializedObjects</a></strong>()</code>
<div class="block">:: Private ::
Returns true if this serializer supports relocation of its serialized objects and false
otherwise.</div>
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<code><a href="../../../../org/apache/spark/serializer/Serializer.html#defaultClassLoader()">defaultClassLoader</a>, <a href="../../../../org/apache/spark/serializer/Serializer.html#getSerializer(scala.Option)">getSerializer</a>, <a href="../../../../org/apache/spark/serializer/Serializer.html#getSerializer(org.apache.spark.serializer.Serializer)">getSerializer</a>, <a href="../../../../org/apache/spark/serializer/Serializer.html#setDefaultClassLoader(java.lang.ClassLoader)">setDefaultClassLoader</a></code></li>
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<code><a href="../../../../org/apache/spark/Logging.html#initializeIfNecessary()">initializeIfNecessary</a>, <a href="../../../../org/apache/spark/Logging.html#initializeLogging()">initializeLogging</a>, <a href="../../../../org/apache/spark/Logging.html#isTraceEnabled()">isTraceEnabled</a>, <a href="../../../../org/apache/spark/Logging.html#log_()">log_</a>, <a href="../../../../org/apache/spark/Logging.html#log()">log</a>, <a href="../../../../org/apache/spark/Logging.html#logDebug(scala.Function0)">logDebug</a>, <a href="../../../../org/apache/spark/Logging.html#logDebug(scala.Function0, java.lang.Throwable)">logDebug</a>, <a href="../../../../org/apache/spark/Logging.html#logError(scala.Function0)">logError</a>, <a href="../../../../org/apache/spark/Logging.html#logError(scala.Function0, java.lang.Throwable)">logError</a>, <a href="../../../../org/apache/spark/Logging.html#logInfo(scala.Function0)">logInfo</a>, <a href="../../../../org/apache/spark/Logging.html#logInfo(scala.Function0, java.lang.Throwable)">logInfo</a>, <a href="../../../../org/apache/spark/Logging.html#logName()">logName</a>, <a href="../../../../org/apache/spark/Logging.html#logTrace(scala.Function0)">logTrace</a>, <a href="../../../../org/apache/spark/Logging.html#logTrace(scala.Function0, java.lang.Throwable)">logTrace</a>, <a href="../../../../org/apache/spark/Logging.html#logWarning(scala.Function0)">logWarning</a>, <a href="../../../../org/apache/spark/Logging.html#logWarning(scala.Function0, java.lang.Throwable)">logWarning</a></code></li>
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<h4>KryoSerializer</h4>
<pre>public KryoSerializer(<a href="../../../../org/apache/spark/SparkConf.html" title="class in org.apache.spark">SparkConf</a> conf)</pre>
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<pre>public int maxBufferSizeMb()</pre>
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<pre>public com.esotericsoftware.kryo.io.Output newKryoOutput()</pre>
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<pre>public com.esotericsoftware.kryo.Kryo newKryo()</pre>
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<pre>public <a href="../../../../org/apache/spark/serializer/SerializerInstance.html" title="class in org.apache.spark.serializer">SerializerInstance</a> newInstance()</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../../../org/apache/spark/serializer/Serializer.html#newInstance()">Serializer</a></code></strong></div>
<div class="block">Creates a new <a href="../../../../org/apache/spark/serializer/SerializerInstance.html" title="class in org.apache.spark.serializer"><code>SerializerInstance</code></a>.</div>
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<pre>public boolean supportsRelocationOfSerializedObjects()</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../../../org/apache/spark/serializer/Serializer.html#supportsRelocationOfSerializedObjects()">Serializer</a></code></strong></div>
<div class="block">:: Private ::
Returns true if this serializer supports relocation of its serialized objects and false
otherwise. This should return true if and only if reordering the bytes of serialized objects
in serialization stream output is equivalent to having re-ordered those elements prior to
serializing them. More specifically, the following should hold if a serializer supports
relocation:
<p>
<pre><code>
serOut.open()
position = 0
serOut.write(obj1)
serOut.flush()
position = # of bytes writen to stream so far
obj1Bytes = output[0:position-1]
serOut.write(obj2)
serOut.flush()
position2 = # of bytes written to stream so far
obj2Bytes = output[position:position2-1]
serIn.open([obj2bytes] concatenate [obj1bytes]) should return (obj2, obj1)
</code></pre>
<p>
In general, this property should hold for serializers that are stateless and that do not
write special metadata at the beginning or end of the serialization stream.
<p>
This API is private to Spark; this method should not be overridden in third-party subclasses
or called in user code and is subject to removal in future Spark releases.
<p>
See SPARK-7311 for more details.</div>
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