saveNamespace should not throw IOE when only one storage directory fails to
write VERSION file
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Key: HDFS-2173
URL: https://issues.apache.org/jira/browse/HDFS-2173
Project: Hadoop HDFS
Issue Type: Sub-task
Affects Versions: Edit log branch (HDFS-1073), 0.23.0
Reporter: Todd Lipcon
This JIRA tracks a TODO in TestSaveNamespace. Currently, if, while writing the
VERSION files in the storage directories, one of the directories fails, the
entire operation throws IOE. This is unnecessary -- instead, just that
directory should be marked as failed.
This is targeted to be fixed _after_ HDFS-1073 is merged to trunk, since it
does not ever dataloss, and would rarely occur in practice (the dir would have
to fail between writing the fsimage file and writing VERSION)
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