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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6679) RegionServer aborts due to race between compaction and split
Date Wed, 26 Sep 2012 05:24:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463535#comment-13463535
] 

ramkrishna.s.vasudevan commented on HBASE-6679:
-----------------------------------------------

@Deva
Am not able to tell clearly what is the problem.  I too went thro those logs and found that
the region 5689a8785bbc9a8aa8e526cd7ef1542a has completed the compaction.

{code}
2012-08-28 06:15:34,107 INFO org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest:
completed compaction: regionName=TestLoadAndVerify_1346120615716,\xD8\x0D\x03\x00\x00\x00\x00\x00/000007_0,1346125261573.5689a8785bbc9a8aa8e526cd7ef1542a.,
storeName=f1, fileCount=3, fileSize=27.3m, priority=3, time=14360293782301; duration=4sec

{code}
and later the split has started for the region (after 2 ms)
{code}
2012-08-28 06:15:34,109 INFO org.apache.hadoop.hbase.regionserver.SplitTransaction: Starting
split of region TestLoadAndVerify_1346120615716,\xD8\x0D\x03\x00\x00\x00\x00\x00/000007_0,1346125261573.5689a8785bbc9a8aa8e526cd7ef1542a.
{code}
The offlining of the region is done here

{code}
2012-08-28 06:15:34,788 INFO org.apache.hadoop.hbase.catalog.MetaEditor: Offlined parent region
TestLoadAndVerify_1346120615716,\xD8\x0D\x03\x00\x00\x00\x00\x00/000007_0,1346125261573.5689a8785bbc9a8aa8e526cd7ef1542a.
in META
{code}
So before this itself the region got closed. I feel the store file list should have been updated
by the time. No ?

                
> RegionServer aborts due to race between compaction and split
> ------------------------------------------------------------
>
>                 Key: HBASE-6679
>                 URL: https://issues.apache.org/jira/browse/HBASE-6679
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Devaraj Das
>            Assignee: Devaraj Das
>             Fix For: 0.92.3
>
>         Attachments: rs-crash-parallel-compact-split.log
>
>
> In our nightlies, we have seen RS aborts due to compaction and split racing. Original
parent file gets deleted after the compaction, and hence, the daughters don't find the parent
data file. The RS kills itself when this happens. Will attach a snippet of the relevant RS
logs.

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