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Date: Fri, 11 May 2012 05:08:45 +0000 (UTC)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-5986) Clients can see holes in the META
 table when regions are being split
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    [ https://issues.apache.org/jira/browse/HBASE-5986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273045#comment-13273045 ] 

Lars Hofhansl commented on HBASE-5986:
--------------------------------------

@Enis: yes HRegion.mutateRowsWithLock() has correct MVCC semantics even across multi row scans. 

The region boundary could be between start_key1 and mid_key1 if there rows inserted and deleted before... Still unlikely. To be safe we could just have a splitKeyPolicy that never splits the table prefix (i.e. all keys for the same table are guaranteed to be in the region).

                
> 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: 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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