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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6788) Improve synchronization in BPOfferService with read write lock
Date Wed, 30 Jul 2014 15:11:39 GMT
Yongjun Zhang created HDFS-6788:
-----------------------------------

             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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