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https://issues.apache.org/jira/browse/SPARK-8414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034447#comment-15034447
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Andrew Or commented on SPARK-8414:
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I'll submit a patch today.
> Ensure ContextCleaner actually triggers clean ups
> -------------------------------------------------
>
> Key: SPARK-8414
> URL: https://issues.apache.org/jira/browse/SPARK-8414
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.4.0
> Reporter: Andrew Or
> Assignee: Andrew Or
> Priority: Critical
>
> Right now it cleans up old references only through natural GCs, which may not
> occur if the driver has infinite RAM. We should do a periodic GC to make sure
> that we actually do clean things up. Something like once per 30 minutes seems
> relatively inexpensive.
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