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From "huaxiang sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18490) Modifying a table descriptor to enable replicas does not create replica regions
Date Tue, 22 Aug 2017 07:34:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136456#comment-16136456
] 

huaxiang sun commented on HBASE-18490:
--------------------------------------

Hi [~ram_krish], the logic when newReplicacount is less than the old Count is needed since
it is going to delete extra columns for old replicas. After that,
the column info will be updated by the following line:

https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ModifyTableProcedure.java#L363.

For example, previous it has 4 replicas and later it is changed to 3. The logic will delete
column for replica number 4, and the above line will update replica from 1 to 3. I think the
logic is correct here. Thanks. 

> Modifying a table descriptor to enable replicas does not create replica regions
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-18490
>                 URL: https://issues.apache.org/jira/browse/HBASE-18490
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 1.3.1, 1.2.6, 2.0.0-alpha-1
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>         Attachments: TestRegionReplicasWithRestartScenarios.java
>
>
> After creating a table, if we try to modify the table to enable region replication, the
new Htable Descriptor is not taken into account and the table is enabled again with default
single region.
> Ping [~enis], [~tedyu], [~devaraj].



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