Details
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Improvement
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Status: Closed
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Minor
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Resolution: Fixed
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0.19.1
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None
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None
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Reviewed
Description
In examining a profile of one of my mappers today, I noticed that the method ReentrantLock.lock() in MapTask$MapOutputBuffer seems to be taking up ~11 seconds out of around 100 seconds total. It seems like 10% is an awfully large amount of time to spend in this lock.
Attachments
Attachments
Issue Links
- is duplicated by
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HADOOP-6672 BytesWritable.write(buf) use much more CPU in writeInt() then write(buf)
- Resolved