[jira] [Commented] (SPARK-12165) Execution memory requests may fail to evict storage blocks if storage memory usage is below max memory

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

    [ https://issues.apache.org/jira/browse/SPARK-12165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044342#comment-15044342 ] 

Apache Spark commented on SPARK-12165:
--------------------------------------

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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