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From "Zhihong Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5986) Clients can see holes in the META table when regions are being split
Date Thu, 17 May 2012 02:16:11 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhihong Yu updated HBASE-5986:
------------------------------

    Attachment: 5986-v2.txt

v2 from Enis
                
> Clients can see holes in the META table when regions are being split
> --------------------------------------------------------------------
>
>                 Key: HBASE-5986
>                 URL: https://issues.apache.org/jira/browse/HBASE-5986
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.1, 0.96.0, 0.94.1
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>         Attachments: 5986-v2.txt, HBASE-5986-test_v1.patch
>
>
> We found this issue when running large scale ingestion tests for HBASE-5754. The problem
is that the .META. table updates are not atomic while splitting a region. In SplitTransaction,
there is a time lap between the marking the parent offline, and adding of daughters to the
META table. This can result in clients using MetaScanner, of HTable.getStartEndKeys (used
by the TableInputFormat) missing regions which are made just offline, but the daughters are
not added yet. 
> This is also related to HBASE-4335. 

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