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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2284) fsWriteLatency metric may be incorrectly reported
Date Thu, 04 Mar 2010 01:07:27 GMT
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
            Priority: Minor


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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