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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2241) Change balancer sloppyness from 0.1 to 0.3
Date Fri, 19 Feb 2010 19:54:27 GMT
Change balancer sloppyness from 0.1 to 0.3

                 Key: HBASE-2241
                 URL: https://issues.apache.org/jira/browse/HBASE-2241
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack
             Fix For: 0.20.4, 0.21.0

This is a quick workaround until we do a better balancer.

Taking a region off line when cluster is under load is bad news.  Latency goes up as we wait
on regions to come up in new locations.

The load balancer should only cut in if the cluster is way out of alignment.

I'd argue that 10% deviance from the avg. is not good enough reason moving regions around
when cluster is under load.

Balancer already has a knack for cutting in at most inopportune moments: during cluster startup,
when new node is added to a small cluster, or moving a region just after its been opened on
a node.  We'll need to do a better balancer but meantime lets just allow that region loading
can be sloppier, say 20% or 30% off the average before balancer cuts in.

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