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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5443) Namenode can stuck in safemode on restart if it crashes just after addblock logsync and after taking snapshot for such file.
Date Thu, 07 Nov 2013 05:09:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13815653#comment-13815653
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Uma Maheswara Rao G commented on HDFS-5443:
-------------------------------------------

+1 patch looks good. Thanks Jing, Vinay Sathish for your efforts.


> Namenode can stuck in safemode on restart if it crashes just after addblock logsync and
after taking snapshot for such file.
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5443
>                 URL: https://issues.apache.org/jira/browse/HDFS-5443
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Uma Maheswara Rao G
>            Assignee: sathish
>         Attachments: 5443-test.patch, HDFS-5443.000.patch
>
>
> This issue is reported by Prakash and Sathish.
> On looking into the issue following things are happening.
> .
> 1) Client added block at NN and just did logsync
>    So, NN has block ID persisted.
> 2)Before returning addblock response to client take a snapshot for root or parent directories
for that file
> 3) Delete parent directory for that file
> 4) Now crash the NN with out responding success to client for that addBlock call
> Now on restart of the Namenode, it will stuck in safemode.



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