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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5611) Replayed edits from regions that failed to open during recovery aren't removed from the global MemStore size
Date Fri, 27 Apr 2012 05:14:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263347#comment-13263347

Hadoop QA commented on HBASE-5611:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 2 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/1666//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/1666//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/1666//console

This message is automatically generated.
> Replayed edits from regions that failed to open during recovery aren't removed from the
global MemStore size
> ------------------------------------------------------------------------------------------------------------
>                 Key: HBASE-5611
>                 URL: https://issues.apache.org/jira/browse/HBASE-5611
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.6
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jieshan Bean
>            Priority: Critical
>             Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1
>         Attachments: HBASE-5611-92.patch, HBASE-5611-94-minorchange.patch, HBASE-5611-trunk-v2-minorchange.patch
> This bug is rather easy to get if the {{TimeoutMonitor}} is on, else I think it's still
possible to hit it if a region fails to open for more obscure reasons like HDFS errors.
> Consider a region that just went through distributed splitting and that's now being opened
by a new RS. The first thing it does is to read the recovery files and put the edits in the
{{MemStores}}. If this process takes a long time, the master will move that region away. At
that point the edits are still accounted for in the global {{MemStore}} size but they are
dropped when the {{HRegion}} gets cleaned up. It's completely invisible until the {{MemStoreFlusher}}
needs to force flush a region and that none of them have edits:
> {noformat}
> 2012-03-21 00:33:39,303 DEBUG org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Flush
thread woke up because memory above low water=5.9g
> 2012-03-21 00:33:39,303 ERROR org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Cache
flusher failed for entry null
> java.lang.IllegalStateException
>         at com.google.common.base.Preconditions.checkState(Preconditions.java:129)
>         at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushOneForGlobalPressure(MemStoreFlusher.java:199)
>         at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:223)
>         at java.lang.Thread.run(Thread.java:662)
> {noformat}
> The {{null}} here is a region. In my case I had so many edits in the {{MemStore}} during
recovery that I'm over the low barrier although in fact I'm at 0. It happened yesterday and
it still printing this out.
> To fix this we need to be able to decrease the global {{MemStore}} size when the region
can't open.

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