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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HDFS-5681) renewLease should not hold fsn write lock
Date Wed, 18 Dec 2013 16:14:08 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daryn Sharp reassigned HDFS-5681:
---------------------------------

    Assignee: Daryn Sharp

> renewLease should not hold fsn write lock
> -----------------------------------------
>
>                 Key: HDFS-5681
>                 URL: https://issues.apache.org/jira/browse/HDFS-5681
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-5681.patch
>
>
> Lease renewals unnecessarily hold the write lock which reduces throughput.  Currently
the fsn lock doubles as an "operational lock" to prevent state transitions.  If the lease
manager is thread-safe then a read lock is sufficient.



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