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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-3803) Make the load balancer run with a gentle hand
Date Tue, 08 Sep 2015 17:10:46 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack resolved HBASE-3803.
--------------------------
    Resolution: Later

Resolving old umbrella issue whose subtasks have been done.

> Make the load balancer run with a gentle hand
> ---------------------------------------------
>
>                 Key: HBASE-3803
>                 URL: https://issues.apache.org/jira/browse/HBASE-3803
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: stack
>
> We need 'smoothing' of balancer region move.... Yesterday we brought a regionserver back
online into a smallish cluster that was under load and the balance run unloaded a bunch of
regions all in the one go which put a dent in the throughput when a bunch of regions went
offline at the one time.  It'd be sweet if the balancer ran at a context appropriate 'rate';
when under load, it should move regions 'gently' rather than all as a big bang (the decommission
script will move a region at a time, verifying it deployed in its new location before moving
another... this can take ages to complete but its proven minimally disruptive to loadings)



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