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https://issues.apache.org/jira/browse/HDFS-457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732695#action_12732695
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Boris Shkolnik commented on HDFS-457:
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we should also handle failed reads from the failed volumes.
we can take care of it in FSDataset.validateBlockFile() because it is called on
every "read" operation.
> better handling of volume failure in Data Node storage
> ------------------------------------------------------
>
> Key: HDFS-457
> URL: https://issues.apache.org/jira/browse/HDFS-457
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Reporter: Boris Shkolnik
> Assignee: Boris Shkolnik
>
> Current implementation shuts DataNode down completely when one of the
> configured volumes of the storage fails.
> This is rather wasteful behavior because it decreases utilization (good
> storage becomes unavailable) and imposes extra load on the system
> (replication of the blocks from the good volumes). These problems will become
> even more prominent when we move to mixed (heterogeneous) clusters with many
> more volumes per Data Node.
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