[jira] [Created] (HBASE-20049) Region replicas of SPLIT and MERGED regions are kept in in-memory states until restarting master

["Toshihiro Suzuki (JIRA)" <ji...@apache.org>]

Toshihiro Suzuki created HBASE-20049:
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             Summary: 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


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One problem with this is the outdated region replicas can be online.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. Split the table
{code}
split "test"
{code}

3. 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After doing those steps, the outdated region replica will be online.




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