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https://issues.apache.org/jira/browse/SPARK-23306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16349203#comment-16349203
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Apache Spark commented on SPARK-23306:
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User 'zhzhan' has created a pull request for this issue:
https://github.com/apache/spark/pull/20480
> Race condition in TaskMemoryManager
> -----------------------------------
>
> Key: SPARK-23306
> URL: https://issues.apache.org/jira/browse/SPARK-23306
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.2.1
> Reporter: Zhan Zhang
> Priority: Minor
>
> There is race condition in TaskMemoryManger, which may cause OOM.
> The memory released may be taken by another task because there is a gap
> between releaseMemory and acquireMemory, e.g., UnifiedMemoryManager, causing
> the OOM. if the current is the only one that can perform spill. It can happen
> to BytesToBytesMap, as it only spill required bytes.
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