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From "Max Lapan (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4799) Catalog Janitor logic bug causes region leackage
Date Wed, 16 Nov 2011 13:37:51 GMT
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
            Priority: Critical


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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