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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6323) [replication] most of the source metrics are wrong when there's multiple slaves
Date Mon, 09 Jul 2012 21:28:36 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409868#comment-13409868

stack commented on HBASE-6323:

Looks good Mr. Elliott.  Will give J-D honor of blessing it.  I like your moving classes under
metrics package.  Where is the bit where we deal w/ multiple slaves?  Thats in one of the
moved classes?  Good stuff.
> [replication] most of the source metrics are wrong when there's multiple slaves
> -------------------------------------------------------------------------------
>                 Key: HBASE-6323
>                 URL: https://issues.apache.org/jira/browse/HBASE-6323
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.1, 0.94.0
>            Reporter: Jean-Daniel Cryans
>            Assignee: Elliott Clark
>             Fix For: 0.96.0, 0.94.2
>         Attachments: HBASE-6323-0.patch, HBASE-6323-1.patch
> Most of the metrics in replication were written with 1 slave in mind but with multiple
slaves the issue really shows. Most of the metrics are set directly:
> {code}
> public void enqueueLog(Path log) {
>   this.queue.put(log);
>   this.metrics.sizeOfLogQueue.set(queue.size());
> }
> {code}
> So {{sizeOfLogQueue}} is always showing the size of the queue that updated the metric
> I'm not sure what's the right way to fix this since we can't have dynamic metrics. Merging
them would work here but it wouldn't work so well with {{ageOfLastShippedOp}} since the age
can be different and it definitely cannot be summed.
> Assigning to Elliott since he seems to dig metrics these days. 

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