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https://issues.apache.org/jira/browse/SPARK-21090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-21090.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 18296
[https://github.com/apache/spark/pull/18296]
> Optimize the unified memory manager code
> -----------------------------------------
>
> Key: SPARK-21090
> URL: https://issues.apache.org/jira/browse/SPARK-21090
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.3.0
> Reporter: liuxian
> Fix For: 2.3.0
>
>
> 1.In *acquireStorageMemory*, when the MemoryMode is OFF_HEAP ,the *maxMemory*
> should be modified to *maxOffHeapStorageMemory*
> 2. Borrow memory from execution, *numBytes* modified to *numBytes -
> storagePool.memoryFree* will be more reasonable
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