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From "Chris Lohfink (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11569) Track message latency across DCs
Date Fri, 20 May 2016 16:05:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15293608#comment-15293608
] 

Chris Lohfink commented on CASSANDRA-11569:
-------------------------------------------

Its not just mutations that this will use. Any message sent between nodes (ie gossip) will
send a timestamp with it, this just reuses that.

> Track message latency across DCs
> --------------------------------
>
>                 Key: CASSANDRA-11569
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11569
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Observability
>            Reporter: Chris Lohfink
>            Assignee: Chris Lohfink
>            Priority: Minor
>         Attachments: CASSANDRA-11569.patch, CASSANDRA-11569v2.txt, nodeLatency.PNG
>
>
> Since we have the timestamp a message is created and when arrives, we can get an approximate
time it took relatively easy and would remove necessity for more complex hacks to determine
latency between DCs.
> Although is not going to be very meaningful when ntp is not setup, it is pretty common
to have NTP setup and even with clock drift nothing is really hurt except the metric becoming
whacky.



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