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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4075) Reduce recommissioning overhead
Date Thu, 01 Nov 2012 20:33:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489006#comment-13489006
] 

Tsz Wo (Nicholas), SZE commented on HDFS-4075:
----------------------------------------------

+1 the patch looks good.  One minor comment: it is better to add a space after "Invalidated".

{code}
+    LOG.info("Invalidated" + numOverReplicated + " over-replicated blocks on " +
+        srcNode + " during recommissioning");
{code}
                
> Reduce recommissioning overhead
> -------------------------------
>
>                 Key: HDFS-4075
>                 URL: https://issues.apache.org/jira/browse/HDFS-4075
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.4, 2.0.2-alpha
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>         Attachments: hdfs-4075.patch, hdfs-4075.patch
>
>
> When datanodes are recommissioned, {BlockManager#processOverReplicatedBlocksOnReCommission()}
is called for each rejoined node and excess blocks are added to the invalidate list. The problem
is this is done while the namesystem write lock is held.

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