HA: add tests for multiple shared edits dirs
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Key: HDFS-2735
URL: https://issues.apache.org/jira/browse/HDFS-2735
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, test
Affects Versions: HA branch (HDFS-1623)
Reporter: Eli Collins
You can configure and run with multiple shared edits dirs but we don't have any
test coverage for them. In particular, we should cover the behavior of the edit
log tailer with multiple dirs, and failure scenarios (eg can we tolerate a
single shared dir failure if we have two shared dirs).
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