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https://issues.apache.org/jira/browse/SPARK-12165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044342#comment-15044342
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Apache Spark commented on SPARK-12165:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/10170
> Execution memory requests may fail to evict storage blocks if storage memory
> usage is below max memory
> ------------------------------------------------------------------------------------------------------
>
> Key: SPARK-12165
> URL: https://issues.apache.org/jira/browse/SPARK-12165
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Blocker
>
> Consider a scenario where storage memory usage has grown past the size of the
> unevictable storage region ({{spark.memory.storageFraction}} * maxMemory) and
> a task needs to acquire more execution memory by reclaiming evictable storage
> memory. If the storage memory usage is less than maxMemory, then there's a
> possibility that no storage blocks will be evicted. This is caused by how
> {{MemoryStore.ensureFreeSpace()}} is called inside of
> {{StorageMemoryPool.shrinkPoolToReclaimSpace()}}.
> Here's a failing regression test which demonstrates this bug:
> https://github.com/apache/spark/commit/b519fe628a9a2b8238dfedbfd9b74bdd2ddc0de4?diff=unified#diff-b3a7cd2e011e048908d70f743c0ed7cfR155
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