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Posted to issues@hbase.apache.org by "Enis Soztutar (JIRA)" <ji...@apache.org> on 2012/05/11 01:53:48 UTC
[jira] [Updated] (HBASE-5986) Clients can see holes in the META
table when regions are being split
[ https://issues.apache.org/jira/browse/HBASE-5986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enis Soztutar updated HBASE-5986:
---------------------------------
Attachment: HBASE-5986-test_v1.patch
Attaching a unit test to illustrate the problem. The test fails for me when splitting the first region, the client sees 0 regions for some time.
> 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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