Provide more accurate check for super underloaded region server in load balancer
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Key: HBASE-3799
URL: https://issues.apache.org/jira/browse/HBASE-3799
Project: HBase
Issue Type: Bug
Components: mapreduce
Affects Versions: 0.90.2
Reporter: Ted Yu
Assignee: Ted Yu
HBASE-3609 used simple check for region server which recently joined the
cluster so that both young and old regions from other region servers are
assigned to it.
The check was too strict.
1 or more region may be assigned to this server before load balancer performs
rebalancing.
The next time balancer runs, it wouldn't treat this server as seriously
underloaded correctly and assign a lot of young regions to it.
We can use threshold over the number of regions to avoid such issue.
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