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https://issues.apache.org/jira/browse/SPARK-11276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-11276.
-------------------------------
Resolution: Fixed
Fix Version/s: 1.6.0
Issue resolved by pull request 9244
[https://github.com/apache/spark/pull/9244]
> SizeEstimator prevents class unloading
> --------------------------------------
>
> Key: SPARK-11276
> URL: https://issues.apache.org/jira/browse/SPARK-11276
> Project: Spark
> Issue Type: Bug
> Components: Block Manager, Spark Core
> Affects Versions: 1.5.1
> Reporter: Sem Mulder
> Fix For: 1.6.0
>
>
> The SizeEstimator keeps a cache of ClassInfos but this cache uses Class
> objects as keys.
> Which results in strong references to the Class objects. If these classes are
> dynamically created
> this prevents the corresponding ClassLoader from being GCed. Leading to
> PermGen exhaustion.
> An easy fix would be to use a WeakRef for the keys. A proposed fix can be
> found here:
> [https://github.com/Site2Mobile/spark/commit/21c572cbda5607d0c7c6643bfaf43e53c8aa6f8c]
> We are currently running this in production and it seems to resolve the issue.
> I will prepare a pull request ASAP.
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