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https://issues.apache.org/jira/browse/SPARK-12253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049918#comment-15049918
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Apache Spark commented on SPARK-12253:
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User 'andrewor14' has created a pull request for this issue:
https://github.com/apache/spark/pull/10240
> UnifiedMemoryManager race condition: storage can starve new tasks
> -----------------------------------------------------------------
>
> Key: SPARK-12253
> URL: https://issues.apache.org/jira/browse/SPARK-12253
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.6.0
> Reporter: Andrew Or
> Assignee: Andrew Or
> Priority: Blocker
>
> The following race condition is possible with the existing code in unified
> memory management:
> (1) Existing tasks collectively occupy all execution memory
> (2) New task comes in and blocks while existing tasks spill
> (3) After tasks finish spilling, another task jumps in and puts in a large
> block, stealing the freed memory
> (4) New task still cannot acquire memory and goes back to sleep
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