[jira] [Assigned] (SPARK-11276) SizeEstimator prevents class unloading

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-11276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-11276:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>
> 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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