Todd Lipcon created HDFS-3867:
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Summary: QJM: Support rolling restart of JNs
Key: HDFS-3867
URL: https://issues.apache.org/jira/browse/HDFS-3867
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha
Affects Versions: QuorumJournalManager (HDFS-3077)
Reporter: Todd Lipcon
Assignee: Todd Lipcon
In order to perform upgrades or other maintenance, it is useful to be able to
perform a rolling restart of the journal nodes while the NameNode is active.
Currently, this does not work, because the NN only picks up restarted JNs again
on the beginning of the next log segment. So, if the NN does not roll after
each node is restarted in turn, the NN will eventually fail to commit to a
quorum and crash.
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