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

     [ https://issues.apache.org/jira/browse/HDFS-6788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yongjun Zhang updated HDFS-6788:
--------------------------------

    Component/s: datanode

> 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
>          Components: datanode
>    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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