HA: Support multiple shared edits dirs
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Key: HDFS-2782
URL: https://issues.apache.org/jira/browse/HDFS-2782
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha
Affects Versions: HA branch (HDFS-1623)
Reporter: Eli Collins
Assignee: Eli Collins
Supporting multiple shared dirs will improve availability (eg see HDFS-2769).
You may want to use multiple shared dirs on a single filer (eg for better fault
isolation) or because you want to use multiple filers/mounts. Per HDFS-2752
(and HDFS-2735) we need to do things like use the JournalSet in EditLogTailer
and add tests.
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