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Jason Brown commented on CASSANDRA-12966:
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After many months, I finally rebased and committed (tests still passed). commit
sha is {{ec85b4a96390ef5bf85acac42f9c93a68620b668}}
> Gossip thread slows down when using batch commit log
> ----------------------------------------------------
>
> Key: CASSANDRA-12966
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12966
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jason Brown
> Assignee: Jason Brown
> Priority: Minor
>
> When using batch commit log mode, the Gossip thread slows down when peers
> after a node bounces. This is because we perform a bunch of updates to the
> peers table via {{SystemKeyspace.updatePeerInfo}}, which is a synchronized
> method. How quickly each one of those individual updates takes depends on how
> busy the system is at the time wrt write traffic. If the system is largely
> quiescent, each update will be relatively quick (just waiting for the fsync).
> If the system is getting a lot of writes, and depending on the
> commitlog_sync_batch_window_in_ms, each of the Gossip thread's updates can
> get stuck in the backlog, which causes the Gossip thread to stop processing.
> We have observed in large clusters that a rolling restart causes triggers and
> exacerbates this behavior.
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