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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4208) NameNode could be stuck in SafeMode due to never-created blocks in branch-1
Date Wed, 21 Nov 2012 02:46:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13501674#comment-13501674

Tsz Wo (Nicholas), SZE commented on HDFS-4208:

+1 patch looks good.
> NameNode could be stuck in SafeMode due to never-created blocks in branch-1
> ---------------------------------------------------------------------------
>                 Key: HDFS-4208
>                 URL: https://issues.apache.org/jira/browse/HDFS-4208
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 1.2.0
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>         Attachments: HDFS-4208.branch-1.patch, HDFS-4208.branch-1.patch
> In one test case, NameNode allocated a block and then was killed before the client got
the addBlock response. After NameNode restarted, it couldn't get out of SafeMode waiting for
the block which was never created. In trunk, NameNode can get out of SafeMode since it only
counts complete blocks. However branch-1 doesn't have the clear notion of under-constructioned-block
in Namenode. 
> JIRA HDFS-4212 is to track the never-created-block issue and this JIRA is to fix NameNode
in branch-1 so it can get out of SafeMode when never-created-block exists.
> The proposed idea is for SafeMode not to count the zero-sized last block in an under-construction
file as part of total blcok count.

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