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https://issues.apache.org/jira/browse/HBASE-20049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373886#comment-16373886
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Ted Yu commented on HBASE-20049:
--------------------------------
+1
> Region replicas of SPLIT and MERGED regions are kept in in-memory states
> until restarting master
> ------------------------------------------------------------------------------------------------
>
> Key: HBASE-20049
> URL: https://issues.apache.org/jira/browse/HBASE-20049
> Project: HBase
> Issue Type: Bug
> Components: read replicas
> Reporter: Toshihiro Suzuki
> Assignee: Toshihiro Suzuki
> Priority: Major
> Attachments: HBASE-20049.master.001.patch,
> HBASE-20049.master.002.patch, HBASE-20049.master.003.patch
>
>
> Currently, when regions are split or merged, region replicas of the regions
> will become CLOSED state but will not be deleted from in-memory states (e.g.
> AssignmentManager). These region replicas are deleted when restarting master,
> but I think they should be deleted during splitting and merging regions.
> One problem with this is the outdated region replicas can be online. Steps to
> reproduce are as follows:
> 1. Create a table with enabling region replication.
> {code}
> create "test", "cf", {REGION_REPLICATION => 2}
> {code}
> 2. Load data to the table
> {code}
> (0...2000).each{|i| put "test", "row#{i}", "cf:col", "val"}
> {code}
> 3. Split the table
> {code}
> split "test"
> {code}
> 4. Disable and enable the table
> {code}
> disable "test"
> enable "test"
> {code}
> After doing those steps, the outdated region replica will be online.
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