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Posted to issues@spark.apache.org by "Matei Zaharia (JIRA)" <ji...@apache.org> on 2014/08/05 05:02:13 UTC
[jira] [Commented] (SPARK-1811) Support resizable output buffer for
kryo serializer
[ https://issues.apache.org/jira/browse/SPARK-1811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085716#comment-14085716 ]
Matei Zaharia commented on SPARK-1811:
--------------------------------------
Closed this as a duplicate of https://issues.apache.org/jira/browse/SPARK-2543.
> Support resizable output buffer for kryo serializer
> ---------------------------------------------------
>
> Key: SPARK-1811
> URL: https://issues.apache.org/jira/browse/SPARK-1811
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Affects Versions: 1.0.0
> Reporter: koert kuipers
> Assignee: Koert Kuipers
> Priority: Minor
> Fix For: 1.1.0
>
>
> Currently the size of kryo serializer output buffer can be set with spark.kryoserializer.buffer.mb
> The issue with this setting is that it has to be one-size-fits-all, so it ends up being the maximum size needed, even if only a single task out of many needs it to be that big. A resizable buffer will allow most tasks to use a modest sized buffer while the incidental task that needs a really big buffer can get it at a cost (allocating a new buffer and copying the contents over repeatedly as the buffer grows... with each new allocation the size doubles).
> The class used for the buffer is kryo Output, which supports resizing if maxCapacity is set bigger than capacity. I suggest we provide a setting spark.kryoserializer.buffer.max.mb which defaults to spark.kryoserializer.buffer.mb, and which sets Output's maxCapacity.
> Pull request for this jira:
> https://github.com/apache/spark/pull/735
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