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[SPARK-2856] Decrease initial buffer size for Kryo to 64KB. #1780

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[SPARK-2856] Decrease initial buffer size for Kryo to 64KB. #1780

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4 changes: 3 additions & 1 deletion core/src/main/scala/org/apache/spark/serializer/KryoSerializer.scala
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Expand Up @@ -47,7 +47,9 @@ class KryoSerializer(conf: SparkConf)
with Logging
with Serializable {

private val bufferSize = conf.getInt("spark.kryoserializer.buffer.mb", 2) * 1024 * 1024
private val bufferSize =
(conf.getDouble("spark.kryoserializer.buffer.mb", 0.064) * 1024 * 1024).toInt
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@andrewor14 andrewor14 Aug 5, 2014

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maybe add a comment // 64KB?

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@rxin rxin Aug 5, 2014

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It's pretty obvious, isn't it?

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@andrewor14 andrewor14 Aug 5, 2014

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well for lazy people like me it's nice if we don't have to spend extra cycles in our head


private val maxBufferSize = conf.getInt("spark.kryoserializer.buffer.max.mb", 64) * 1024 * 1024
private val referenceTracking = conf.getBoolean("spark.kryo.referenceTracking", true)
private val registrationRequired = conf.getBoolean("spark.kryo.registrationRequired", false)
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2 changes: 1 addition & 1 deletion docs/configuration.md
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Expand Up @@ -412,7 +412,7 @@ Apart from these, the following properties are also available, and may be useful
</tr>
<tr>
<td><code>spark.kryoserializer.buffer.mb</code></td>
<td>2</td>
<td>0.064</td>
<td>
Initial size of Kryo's serialization buffer, in megabytes. Note that there will be one buffer
<i>per core</i> on each worker. This buffer will grow up to
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