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https://issues.apache.org/jira/browse/SPARK-735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell resolved SPARK-735.
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Resolution: Fixed
I think this was fixed a long time ago.
> memory leak in KryoSerializer
> -----------------------------
>
> Key: SPARK-735
> URL: https://issues.apache.org/jira/browse/SPARK-735
> Project: Spark
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Reynold Xin
> Assignee: Ram Sriharsha
>
> KryoSerializer uses a ThreadLocal object to store a kryo buffer, which is
> never cleaned up.
> This becomes a serious problem in projects like Shark, where new threads are
> created constantly by the thrift server. As long as the new thread references
> the kryo serializer, it will create a new kryo buffer.
> A simple solution is to remove the ThreadLocal reference, and create a new
> buffer object every time a new kryo serializer instance is created.
> This is not very expensive because large writes actually go through the
> serialization stream interface, which reuse the buffer anyway.
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