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https://issues.apache.org/jira/browse/HBASE-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Lapan updated HBASE-4799:
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Attachment: 0001-Fix-of-Regions-Leaks-problem-in-janitor.patch
> 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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