Biju Nair created HBASE-22300:
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Summary: SLB doesn't perform well with increase in number of
regions
Key: HBASE-22300
URL: https://issues.apache.org/jira/browse/HBASE-22300
Project: HBase
Issue Type: Improvement
Components: Balancer
Reporter: Biju Nair
With increase in number of regions in a cluster the number of steps taken by
balancer in 30 sec (default balancer runtime) reduces noticeably. The following
is the number of steps taken with by balancer with region loads set and running
it without the loads being set i.e. cost functions using region loads are not
fully exercised.
{noformat}
Nodes regions Tables # of steps # of steps
with RS Load With no load
5 50 5 200000 200000
100 2000 110 104707 1000000
100 10000 40 19911 1000000
200 100000 400 870 1000000
{noformat}
As one would expect the reduced number of steps also makes the balancer take
long time to get to an optimal cost.
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