Clara Xiong created HBASE-27302:
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Summary: Adding a trigger for Stochastica Balancer to safeguard
for upper bound outliers.
Key: HBASE-27302
URL: https://issues.apache.org/jira/browse/HBASE-27302
Project: HBase
Issue Type: Bug
Components: Balancer
Reporter: Clara Xiong
In large clusters, if one outlier has a lot of regions, the calculated
imbalance for RegionCountSkewCostFunction is quite low and often fails to
trigger the balancer.
For example, a node with twice average count on a 400-node cluster only produce
an imbalance of 0.004 < 0.02(current default threshold to trigger balancer). An
empty node also have similar effect but we have a safeguard in place.
https://issues.apache.org/jira/browse/HBASE-24139
We can add a safeguard for this so we don't have to lower threshold on larger
clusters that makes the balancer more sensitive to other minor imbalances.
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