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https://issues.apache.org/jira/browse/HBASE-18490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16137449#comment-16137449
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huaxiang sun commented on HBASE-18490:
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Hi [~ram_krish], thanks for the detail explain. I spent some time today to try
the master branch. It is broken that both increasing replica count or
decreasing replica count are not working.
Traced code a bit, the delete is needed to avoid creation of these removed
regions. When table is enabled, the following code will create replica regions
which are not recorded in meta in branch-1.
https://github.com/apache/hbase/blob/branch-1/hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/EnableTableProcedure.java#L425
So for branch-1, it is fine.
With branch-2+, it is broken that the number of regions created is fixed
(loaded from meta at the very begin). Changing replica count does not play
anymore.
https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/EnableTableProcedure.java#L103
We need to fix this logic.
> 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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