[jira] [Created] (HBASE-19021) Restore a few important missing logics for balancer in 2.0

["Jerry He (JIRA)" <ji...@apache.org>]

Jerry He created HBASE-19021:
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             Summary: Restore a few important missing logics for balancer in 2.0
                 Key: HBASE-19021
                 URL: https://issues.apache.org/jira/browse/HBASE-19021
             Project: HBase
          Issue Type: Bug
            Reporter: Jerry He
            Assignee: Jerry He
            Priority: Critical


After looking at the code, and some testing, I see the following things are missing for balancer to work properly after AMv2.

# hbase.master.loadbalance.bytable is not respected. It is always 'bytable'. Previous default is cluster wide, not by table.
# Servers with no assignments is not added for balance consideration.
# Crashed server is not removed from the in-memory server map in RegionStates, which affects balance.
# Draining marker is not respected when balance.

Also try to re-enable {{TestRegionRebalancing}}, which has a {{testRebalanceOnRegionServerNumberChange}}



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