data node process should not die if one dir goes bad
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Key: HADOOP-4480
URL: https://issues.apache.org/jira/browse/HADOOP-4480
Project: Hadoop Core
Issue Type: Bug
Components: fs
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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