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From "Chris Lohfink (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11569) Track message latency across DCs
Date Wed, 18 May 2016 14:13:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15289027#comment-15289027
] 

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

Hmm, Ill add some tests and try it on larger scale and see if I can reproduce/fix any issues.
Most of my testing was with ccm so there wasn't as large latencies.

> 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
>
>
> 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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