Yongjun Zhang created HDFS-6788:
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Summary: Improve synchronization in BPOfferService with read write
lock
Key: HDFS-6788
URL: https://issues.apache.org/jira/browse/HDFS-6788
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.5.0
Reporter: Yongjun Zhang
Assignee: Yongjun Zhang
Threads in DN (DataXceiver, PacketResponder, Async disk worker etc) may block
at BPOfferService.getBlockPoolId() when calling BPOfferService.checkBlock(),
though they are just reading the same blockpool id. This is unnecessary
overhead and may cause trouble when many threads exist. Filing this jira to
replace synchronized method with read write lock (ReentrantReadWriteLock).
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