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https://issues.apache.org/jira/browse/HADOOP-4480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641629#action_12641629
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dhruba borthakur commented on HADOOP-4480:
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If you really want to do this, then we will need better reporting to the
adminstrator so that he/she can come to know that this datanode needs tending
to.
In the existing scheme of things, if a partition becomre read-only, the
datanode shuts down and the adminstrator can see it being listed as 'dead" in
the HDFS UI.
> data node process should not die if one dir goes bad
> ----------------------------------------------------
>
> Key: HADOOP-4480
> URL: https://issues.apache.org/jira/browse/HADOOP-4480
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.18.1
> Reporter: Allen Wittenauer
>
> When multiple directories are configured for the data node process to use to
> store blocks, it currently exits when one of them is not writable. Instead,
> it should either completely ignore that directory or attempt to continue
> reading and then marking it unusable if reads fail.
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