Todd Lipcon created HDFS-3862:
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Summary: QJM: don't require a fencer to be configured if shared
storage has built-in single-writer semantics
Key: HDFS-3862
URL: https://issues.apache.org/jira/browse/HDFS-3862
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha
Affects Versions: QuorumJournalManager (HDFS-3077)
Reporter: Todd Lipcon
Currently, NN HA requires that the administrator configure a fencing method to
ensure that only a single NameNode may write to the shared storage at a time.
Some shared edits storage implementations (like QJM) inherently enforce
single-writer semantics at the storage level, and thus the user should not be
forced to specify one.
We should extend the JournalManager interface so that the HA code can operate
without a configured fencer if the JM has such built-in fencing.
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