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From "Max Lapan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4799) Catalog Janitor logic bug causes region leackage
Date Wed, 16 Nov 2011 17:37:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151362#comment-13151362
] 

Max Lapan commented on HBASE-4799:
----------------------------------

This bug differs from HBASE-4238. 4238 is about regions splitting too fast, but 4799 about
regions splitting too slow.
                
> 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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