[jira] [Commented] (HBASE-3866) Script to add regions gradually to a new regionserver.

["Ted Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-3866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030351#comment-13030351 ] 

Ted Yu commented on HBASE-3866:
-------------------------------

There may be many regions to be moved onto the newly added region server. The script would take some time to execute.
I think balance_switch should be called at the beginning of the script to turn off load balancer. At the end, balancer should be re-enabled.
It may be desirable to introduce a configurable delay after move() returns (line 287).

> Script to add regions gradually to a new regionserver.
> ------------------------------------------------------
>
>                 Key: HBASE-3866
>                 URL: https://issues.apache.org/jira/browse/HBASE-3866
>             Project: HBase
>          Issue Type: Improvement
>          Components: scripts
>    Affects Versions: 0.90.2
>            Reporter: Aravind Gottipati
>            Priority: Minor
>         Attachments: slow_balancer.rb, slow_balancer.rb
>
>
> When a new region server is brought online, the current balancer kicks off a whole bunch of region moves and causes a lot of regions to be un-available right away.  A slower balancer that gradually balances the cluster is probably a good script to have.  I have an initial version that mooches off the region_mover script to do this.

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