Bryan Beaudreault created HBASE-26147:
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Summary: Add dry run mode to hbase balancer
Key: HBASE-26147
URL: https://issues.apache.org/jira/browse/HBASE-26147
Project: HBase
Issue Type: Improvement
Components: Balancer, master
Reporter: Bryan Beaudreault
Assignee: Bryan Beaudreault
It's often rather hard to know how the cost function changes you're making will
affect the balance of the cluster, and currently the only way to know is to run
it. If the cost decisions are not good, you may have just moved many regions
towards a non-ideal balance. Region moves themselves are not free for clients,
and the resulting balance may cause a regression.
We should add a mode to the balancer so that it can be invoked without actually
executing any plans. This will allow an administrator to iterate on their cost
functions and used the balancer's logging to see how their changes would affect
the cluster.
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