[jira] [Commented] (CASSANDRA-3858) expose "propagation delay" metric in JMX

["George (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-3858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16242307#comment-16242307 ] 

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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