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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2457) RS gets stuck compacting region ad infinitum
Date Fri, 16 Apr 2010 05:25:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12857678#action_12857678

Todd Lipcon commented on HBASE-2457:

Managed to use the log level servlet to get debug logs of the no-op compactions:

2010-04-15 22:24:05,594 WARN org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Region
test1,4993900000,1271390277054 has too many store files, putting it back at the end of the
flush queue.
2010-04-15 22:24:05,594 DEBUG org.apache.hadoop.hbase.regionserver.CompactSplitThread: Compaction
requested for region test1,4993900000,1271390277054/1736416594 because: regionserver/
2010-04-15 22:24:05,594 INFO org.apache.hadoop.hbase.regionserver.HRegion: Starting compaction
on region test1,4993900000,1271390277054
2010-04-15 22:24:05,597 DEBUG org.apache.hadoop.hbase.regionserver.Store: Skipped compaction
of 1 file; compaction size of actions: 231.5m; Skipped 7 files, size: 242232921
2010-04-15 22:24:05,598 INFO org.apache.hadoop.hbase.regionserver.HRegion: compaction completed
on region test1,4993900000,1271390277054 in 0sec

> RS gets stuck compacting region ad infinitum
> --------------------------------------------
>                 Key: HBASE-2457
>                 URL: https://issues.apache.org/jira/browse/HBASE-2457
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.4
>            Reporter: Todd Lipcon
>            Priority: Critical
>         Attachments: log.gz, stack
> Testing 0.20_pre_durability@934643, I ended up in a state where one region server got
stuck compacting a single region over and over again forever. This was with a special config
with very low flush threshold in order to stress test flush/compact code.

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