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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9286) ageOfLastShippedOp replication metric doesn't update if the slave regionserver is stalled
Date Fri, 06 Sep 2013 04:29:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13759851#comment-13759851

Lars Hofhansl commented on HBASE-9286:

+1 on the 0.94 patch. This class does not exist in 0.96+, could somebody confirm whether this
is a problem there as well?

> ageOfLastShippedOp replication metric doesn't update if the slave regionserver is stalled
> -----------------------------------------------------------------------------------------
>                 Key: HBASE-9286
>                 URL: https://issues.apache.org/jira/browse/HBASE-9286
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Alex Newman
>            Assignee: Alex Newman
>             Fix For: 0.98.0, 0.94.12, 0.96.1
>         Attachments: 0001-HBASE-9286.-ageOfLastShippedOp-replication-metric-do.patch
> In replicationmanager
>      HRegionInterface rrs = getRS();
>         rrs.replicateLogEntries(Arrays.copyOf(this.entriesArray, currentNbEntries));
> ....
>         this.metrics.setAgeOfLastShippedOp(
>             this.entriesArray[currentNbEntries-1].getKey().getWriteTime());
>         break;
> which makes sense, but is wrong. The problem is that rrs.replicateLogEntries will block
for a very long time if the slave server is suspended or unavailable but not down.
> However this is easy to fix. We just need to call       refreshAgeOfLastShippedOp();
> on a regular basis, in a different thread. I've attached a patch which fixed this for
cdh4. I can make one for trunk and the like as well if you need me to do but it's a small

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