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https://issues.apache.org/jira/browse/HADOOP-4480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641695#action_12641695
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Allen Wittenauer commented on HADOOP-4480:
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Dhruba's makes an excellent point. The admin definitely needs to know more
status on the data nodes in this sort of design.
For smaller clusters, it seems like a bad thing to decommission an entire node
when you only have one bad disk. It would be better for the data node to just
start decomm'ing that dir and/or stop giving block reports for that dir.
[For equal sized disks, RAID may be an alternative. But if you have un-equal
sized disks, RAID isn't an option, as you'll be throwing storage away.]
> 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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