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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 Tue, 01 Sep 2009 18:48:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12750037#action_12750037
] 

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

Potentially.  It really comes down to what does the name node consider 'live'.  In our case,
the name node actually reported all the DNs as live.  But it makes me wonder if we've just
hit a specialized form of HDFS-528.

> 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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