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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3256) HDFS considers blocks under-replicated if topology script is configured with only 1 rack
Date Thu, 12 Apr 2012 16:41:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252560#comment-13252560
] 

Todd Lipcon commented on HDFS-3256:
-----------------------------------

Is this check actually correct? I think you need to check whether the repl queues are initialized,
explicitly. For example, you could enter manual safe mode, in which case the repl queues are
still being tracked, and it's incorrect to not call processMisReplicatedBlocks.
                
> HDFS considers blocks under-replicated if topology script is configured with only 1 rack
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-3256
>                 URL: https://issues.apache.org/jira/browse/HDFS-3256
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-3256.patch, HDFS-3256.patch, HDFS-3256.patch
>
>
> HDFS treats the mere presence of a topology script being configured as evidence that
there are multiple racks. If there is in fact only a single rack, the NN will try to place
the blocks on at least two racks, and thus blocks will be considered to be under-replicated.

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