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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-875) NameNode incorretly handles corrupt replicas
Date Fri, 04 Feb 2011 04:21:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990452#comment-12990452
] 

Konstantin Shvachko commented on HDFS-875:
------------------------------------------

Now that HDFS-900 is closed, should we close this one as well?
If not than it would be good to have a precise description of what the problem is, how it
reveals itself, is it reproducible, and have anybody seen it live.

> NameNode incorretly handles corrupt replicas
> --------------------------------------------
>
>                 Key: HDFS-875
>                 URL: https://issues.apache.org/jira/browse/HDFS-875
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.22.0
>
>
> I reviewed how NameNode handles corrupt replicas as part of work on HDFS-145. Comparing
to releases prior to 0.21, NameNode now does a good job identifying corrupt replicas, but
it seems to me there are two flaws how it handles the corrupt replicas:
> 1. NameNode does not add corrupt replicas to the block locations as what NameNode does
before;
> 2. If the corruption is caused by generation stamp mismatch or state mismatch, the wrong
GS and state do not get put in corruptReplicasMap. Therefore it may lead to the deletion of
the wrong replica. 

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