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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-580) Name node will exit safe mode w/0 blocks even if data nodes are broken
Date Mon, 31 Aug 2009 17:51:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749553#action_12749553
] 

Allen Wittenauer commented on HDFS-580:
---------------------------------------

My gut tells me that since there are zero blocks assigned, the name node is just happy to
get a response not really caring what that response is.

> Name node will exit safe mode w/0 blocks even if data nodes are broken
> ----------------------------------------------------------------------
>
>                 Key: HDFS-580
>                 URL: https://issues.apache.org/jira/browse/HDFS-580
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Allen Wittenauer
>
> If one brings up a freshly formatted name node against older data nodes with an incompatible
storage id (such that the datanodes fail with Directory /mnt/u001/dfs-data is in an inconsistent
state: is incompatible with others.), the name node will still come out of safe mode.  Writes
will partially succeed--entries are created, but all are zero length.

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