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Posted to issues@hbase.apache.org by "Clara Xiong (Jira)" <ji...@apache.org> on 2022/08/14 01:03:00 UTC

[jira] [Created] (HBASE-27302) Adding a trigger for Stochastica Balancer to safeguard for upper bound outliers.

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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