Tsz Wo Nicholas Sze created HDFS-8437:
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Summary: Fail/warn if HDFS is setup with an even number of QJMs.
Key: HDFS-8437
URL: https://issues.apache.org/jira/browse/HDFS-8437
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Tsz Wo Nicholas Sze
Assignee: Tsz Wo Nicholas Sze
Priority: Minor
When setting an even number (2n, n>1) of QJMs, the number of failure it can
tolerate is the same as one node less (2n-1). Therefore, it does not make
sense to setup with an even number of QJMs. We should either fail it or warn
the users.
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