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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-606) ConcurrentModificationException in invalidateCorruptReplicas()
Date Mon, 22 Aug 2011 21:18:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089017#comment-13089017
] 

Jitendra Nath Pandey commented on HDFS-606:
-------------------------------------------

+1 for hdfs-606-20s.patch.

> ConcurrentModificationException in invalidateCorruptReplicas()
> --------------------------------------------------------------
>
>                 Key: HDFS-606
>                 URL: https://issues.apache.org/jira/browse/HDFS-606
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.20-append, 0.20.205.0, 0.21.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.20-append, 0.20.205.0, 0.21.0
>
>         Attachments: CMEinCorruptReplicas.patch, hdfs-606-20s.patch, hdfs-606-branch20.txt
>
>
> {{BlockManager.invalidateCorruptReplicas()}} iterates over DatanodeDescriptor-s while
removing corrupt replicas from the descriptors. This causes {{ConcurrentModificationException}}
if there is more than one replicas of the block. I ran into this exception debugging different
scenarios in append, but it should be fixed in the trunk too.

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