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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4799) Catalog Janitor logic bug causes region leackage
Date Wed, 16 Nov 2011 19:16:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151434#comment-13151434

Hadoop QA commented on HBASE-4799:

-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 appears to have generated -163 warning messages.

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

    -1 findbugs.  The patch appears to introduce 51 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/265//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/265//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/265//console

This message is automatically generated.
> Catalog Janitor logic bug causes region leackage
> ------------------------------------------------
>                 Key: HBASE-4799
>                 URL: https://issues.apache.org/jira/browse/HBASE-4799
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.90.4
>            Reporter: Max Lapan
>            Assignee: Max Lapan
>            Priority: Critical
>         Attachments: 0001-Fix-of-Regions-Leaks-problem-in-janitor.patch, 0002-Temporary-fix-to-remove-leaked-regions.patch
> When region split takes a significant amount of time, CatalogJanitor can cleanup one
of SPLIT records, but left another in META. When another split finish, janitor cleans left
SPLIT record, but parent regions haven't removed from FS and META not cleared.
> The race condition is follows:
> 1. region split started
> 2. one of regions splitted, i.e. A (have no reference storefiles) but other (B) doesn't
> 3. janitor started and in routine checkDaughter removes SPLITA from meta, but see that
SPLITB has references and does nothing.
> 4. region B completes split
> 5. janitor wakes up, removes SPLITB, but see that there is no records for A and does
nothing again.
> Result - parent region hangs forever.

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