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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11143) ageOfLastShippedOp metric is confusing
Date Mon, 12 May 2014 17:24:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995276#comment-13995276
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Lars Hofhansl commented on HBASE-11143:
---------------------------------------

Yep, I'd add the new metric to 0.96 and later.
Cool... I'll commit this to all branches in a bit (0.96+ will only get the new metric).

> ageOfLastShippedOp metric is confusing
> --------------------------------------
>
>                 Key: HBASE-11143
>                 URL: https://issues.apache.org/jira/browse/HBASE-11143
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.20
>
>         Attachments: 11143-0.94-v2.txt, 11143-0.94.txt
>
>
> We are trying to report on replication lag and find that there is no good single metric
to do that.
> ageOfLastShippedOp is close, but unfortunately it is increased even when there is nothing
to ship on a particular RegionServer.
> I would like discuss a few options here:
> Add a new metric: replicationQueueTime (or something) with the above meaning. I.e. if
we have something to ship we set the age of that last shipped edit, if we fail we increment
that last time (just like we do now). But if there is nothing to replicate we set it to current
time (and hence that metric is reported to close to 0).
> Alternatively we could change the meaning of ageOfLastShippedOp to mean to do that. That
might lead to surprises, but the current behavior is clearly weird when there is nothing to
replicate.
> Comments? [~jdcryans], [~stack].
> If approach sounds good, I'll make a patch for all branches.



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