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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9286) [0.94] ageOfLastShippedOp replication metric doesn't update if the slave regionserver is stalled
Date Fri, 06 Sep 2013 05:15:54 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-9286:
---------------------------------

    Fix Version/s:     (was: 0.96.1)
                       (was: 0.98.0)
          Summary: [0.94] ageOfLastShippedOp replication metric doesn't update if the slave
regionserver is stalled  (was: ageOfLastShippedOp replication metric doesn't update if the
slave regionserver is stalled)

Cool. Making it 0.94 only, then.
Going to commit tomorrow, unless I hear objections.
                
> [0.94] 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: 0.94.12
>
>         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
change.

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