[Spark-23306] Fix the oom caused by contention #20480
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Test build #86943 has finished for PR 20480 at commit
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Test build #86944 has finished for PR 20480 at commit
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jiangxb1987
approved these changes
Feb 2, 2018
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LGTM this should be correct logically, and I can't think out a better way to resolve it. cc @cloud-fan
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thanks, merging to master! |
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What changes were proposed in this pull request?
here 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.
Loop on current consumer if it still has memory to release.
How was this patch tested?
The race contention is hard to reproduce, but the current logic seems causing the issue.
Please review http://spark.apache.org/contributing.html before opening a pull request.