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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3503) Race condition when client and namenode start block recovery simultaneously
Date Fri, 06 Jun 2008 17:19:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HADOOP-3503:
-------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.18.0
           Status: Resolved  (was: Patch Available)

I just committed this.

> Race condition when client and namenode start block recovery simultaneously
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-3503
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3503
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.0
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.18.0
>
>         Attachments: pingPong.patch, pingPong2.patch
>
>
> When a client detects a error while writing to a block, it starts the generation-stamp-protocol
to remove stale replicas. At the same time, if the namenode experiences a lease expiry event
for that file, the namenode starts the generation-stamp-protocol for the same block. Now,
the client and thr namenode ping-pongs trying to stamp the block replicas. This ping-pong
can continue for a long time.

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