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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3198) HLog periodic roll doesn't seem to care about MemStores
Date Fri, 05 Nov 2010 17:48:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928702#action_12928702
] 

Kannan Muthukkaruppan commented on HBASE-3198:
----------------------------------------------

JD: Keep us posted. This looks important. Thanks for looking into this.

> HLog periodic roll doesn't seem to care about MemStores
> -------------------------------------------------------
>
>                 Key: HBASE-3198
>                 URL: https://issues.apache.org/jira/browse/HBASE-3198
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>            Priority: Blocker
>             Fix For: 0.90.0
>
>
> From the mailing list, Erdem Agaoglu found a case where when an HLog gets rolled from
the periodic log roller and it gets archived even tho the region (ROOT) still has edits in
the MemStore. I did an experiment on a local empty machine and it does look broken:
> {noformat}
> org.apache.hadoop.hbase.regionserver.LogRoller: Hlog roll period 6000ms elapsed
> org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter: Using syncFs -- HDFS-200
> org.apache.hadoop.hbase.regionserver.wal.HLog: Roll /hbase-89-su/.logs/hbasedev,60020,1288977933643/10.10.1.177%3A60020.1288977933829,
entries=1,
>  filesize=295. New hlog /hbase-89-su/.logs/hbasedev,60020,1288977933643/10.10.1.177%3A60020.1288977943913
> org.apache.hadoop.hbase.regionserver.wal.HLog: Found 1 hlogs to remove  out of total
1; oldest outstanding sequenceid is 270055 from region -ROOT-,,0
> org.apache.hadoop.hbase.regionserver.wal.HLog: moving old hlog file /hbase-89-su/.logs/hbasedev,60020,1288977933643/10.10.1.177%3A60020.1288977933829
>  whose highest sequenceid is 270054 to /hbase-89-su/.oldlogs/10.10.1.177%3A60020.1288977933829
> {noformat}
> Marking as Blocker and taking a deeper look.

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