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https://issues.apache.org/jira/browse/CASSANDRA-13480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068439#comment-16068439
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Chris Lohfink commented on CASSANDRA-13480:
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+1
> nodetool repair can hang forever if we lose the notification for the repair
> completing/failing
> ----------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-13480
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13480
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Reporter: Matt Byrd
> Assignee: Matt Byrd
> Priority: Minor
> Labels: repair
> Fix For: 4.x
>
>
> When a Jmx lost notification occurs, sometimes the lost notification in
> question is the notification which let's RepairRunner know that the repair is
> finished (ProgressEventType.COMPLETE or even ERROR for that matter).
> This results in nodetool process running the repair hanging forever.
> I have a test which reproduces the issue here:
> https://github.com/Jollyplum/cassandra-dtest/tree/repair_hang_test
> To fix this, If on receiving a notification that notifications have been lost
> (JMXConnectionNotification.NOTIFS_LOST), we instead query a new endpoint via
> Jmx to receive all the relevant notifications we're interested in, we can
> replay those we missed and avoid this scenario.
> It's possible also that the JMXConnectionNotification.NOTIFS_LOST itself
> might be lost and so for good measure I have made RepairRunner poll
> periodically to see if there were any notifications that had been sent but we
> didn't receive (scoped just to the particular tag for the given repair).
> Users who don't use nodetool but go via jmx directly, can still use this new
> endpoint and implement similar behaviour in their clients as desired.
> I'm also expiring the notifications which have been kept on the server side.
> Please let me know if you've any questions or can think of a different
> approach, I also tried setting:
> JVM_OPTS="$JVM_OPTS -Djmx.remote.x.notification.buffer.size=5000"
> but this didn't fix the test. I suppose it might help under certain scenarios
> but in this test we don't even send that many notifications so I'm not
> surprised it doesn't fix it.
> It seems like getting lost notifications is always a potential problem with
> jmx as far as I can tell.
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