liuxian created SPARK-21090:
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Summary: 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
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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