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