[jira] [Reopened] (HBASE-25666) Explain why balancer is skipping runs

["Clara Xiong (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-25666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Clara Xiong reopened HBASE-25666:
---------------------------------

Add more logging

> Explain why balancer is skipping runs
> -------------------------------------
>
>                 Key: HBASE-25666
>                 URL: https://issues.apache.org/jira/browse/HBASE-25666
>             Project: HBase
>          Issue Type: Improvement
>          Components: Balancer, master, UI
>            Reporter: Clara Xiong
>            Assignee: Zhuoyue Huang
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.5.0, 2.4.4
>
>
> Balancer needs to find the balance of keeping cluster balanced and stable. There is a configuration minCostNeedBalance as the threshold of imbalance to try to balance. Since we use a single score to combine all the factors we consider, it is hard for operation to understand why balancer is "stuck". We should add to master-status UI to show balancer is skipping runs and explain all factors considered, such as the weight and cost of all cost functions.
>  



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