ramkrishna.s.vasudevan created HBASE-23958:
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Summary: Balancer keeps balancing indefinitely
Key: HBASE-23958
URL: https://issues.apache.org/jira/browse/HBASE-23958
Project: HBase
Issue Type: Bug
Components: Region Assignment
Affects Versions: 2.0.2
Reporter: ramkrishna.s.vasudevan
Assignee: ramkrishna.s.vasudevan
Fix For: 2.3.0
Before raising this issue - am not sure if this got fixed directly or
indirectly in other latest versions of hbase.
The steps are
1) Create a cluster and create some tables. (assume we have RS 1,2,3, 4 and 5)
2) After the table creation and some ops done, the cluster was restarted. Due
to this some regions are in RIT. the RIT in progress was to be assigned to RS
3.
3) After the cluster comes back RS 3 and 4 are stopped. (RS 3 will have newer
timestamp)
4) Now the master that comes up sees there are some RIT in place and tries to
load the entries to process the procedures again. As part of this the
RegionStateStore is populated with the old RS 3 hostname. (older timestamp).
This adds to the ServerStateNode creating a RS 3 with old timestamp as one
server.
5) Now after the master restarts and all regions assigned, the balancer
infinitely tries to balance the region to the RS 3 (old timestamp server)
thinking it is part of the cluster.
6)the other problem is the MoveProcedure has the target as RS 3 (with old
timestamp) but the AM realizes that it is a down server and move it to the one
of the active server. But this is not recorded anywhere.
I will continue to check the latest code if this case is valid.
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