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https://issues.apache.org/jira/browse/CASSANDRA-3858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16242307#comment-16242307
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George commented on CASSANDRA-3858:
-----------------------------------
I'm surprised there's not great interest for such a feature. Propagation delays
must be a valid concern. What am I missing?
> expose "propagation delay" metric in JMX
> ----------------------------------------
>
> Key: CASSANDRA-3858
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3858
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Peter Schuller
> Priority: Minor
>
> My idea is to augment the gossip protocol to contain timestamps. We wouldn't
> use the timestamps for anything "important", but we could use them to allow
> each node to expose a number which is the number of milliseconds (or seconds)
> "old" information is about nodes that are "the oldest" and also alive.
> When nodes go down you'd see spikes, but for most cases where nodes live,
> this information should give you a pretty good idea of how fast gossip
> information is propagating through the cluster, assuming you keep your clocks
> in synch.
> It should be a good thing to have graphed, and to have alerts on.
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