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https://issues.apache.org/jira/browse/HDFS-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12750033#action_12750033
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Todd Lipcon commented on HDFS-580:
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Can this be fixed by 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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