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https://issues.apache.org/jira/browse/HBASE-2284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12841458#action_12841458
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Jean-Daniel Cryans commented on HBASE-2284:
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I just committed a fix for mdc_replication since it wasn't compiling anymore.
> fsWriteLatency metric may be incorrectly reported
> --------------------------------------------------
>
> Key: HBASE-2284
> URL: https://issues.apache.org/jira/browse/HBASE-2284
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: Kannan Muthukkaruppan
> Assignee: Kannan Muthukkaruppan
> Priority: Minor
> Fix For: 0.20.4, 0.21.0
>
> Attachments: 2284_0.20.patch
>
>
> fsWriteLatency metric is computed by maintaining writeTime & writeOps in
> HLog. If an HLog.append() carries multiple edits, then "writeTime" is
> computed incorrectly for the subsequent edits because doWrite() is called for
> each of the edits with the same start time argument ("now").
> This also causes a lot of false WARN spews to the log. Only one of the edits
> might have taken a long time, but every edit after that in a given
> HLog.append() operation will also raise these warning messages.
> {code}
> 2010-03-03 11:00:42,247 WARN org.apache.hadoop.hbase.regionserver.HLog: IPC
> Server handler 51 on 60020 took 1814ms appending an edit to hlog;
> editcount=302227
> 2010-03-03 11:00:42,247 WARN org.apache.hadoop.hbase.regionserver.HLog: IPC
> Server handler 51 on 60020 took 1814ms appending an edit to hlog;
> editcount=302228
> 2010-03-03 11:00:42,247 WARN org.apache.hadoop.hbase.regionserver.HLog: IPC
> Server handler 51 on 60020 took 1814ms appending an edit to hlog;
> editcount=302229
> 2010-03-03 11:00:42,247 WARN org.apache.hadoop.hbase.regionserver.HLog: IPC
> Server handler 51 on 60020 took 1814ms appending an edit to hlog;
> editcount=302230
> 2010-03-03 11:00:42,247 WARN org.apache.hadoop.hbase.regionserver.HLog: IPC
> Server handler 51 on 60020 took 1814ms appending an edit to hlog;
> editcount=302231
> {code}
> Will submit a patch shortly.
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