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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2012/12/04 20:12:59 UTC
[jira] [Updated] (HBASE-3373) Allow regions to be load-balanced by
table
[ https://issues.apache.org/jira/browse/HBASE-3373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ted Yu updated HBASE-3373:
--------------------------
Release Note:
There is a parameter, hbase.regions.slop, with default value of 0.2
This parameter allows actual region count to deviate by this percentage from (ideal) average region count.
> Allow regions to be load-balanced by table
> ------------------------------------------
>
> Key: HBASE-3373
> URL: https://issues.apache.org/jira/browse/HBASE-3373
> Project: HBase
> Issue Type: Improvement
> Components: master
> Affects Versions: 0.20.6
> Reporter: Ted Yu
> Assignee: Ted Yu
> Fix For: 0.94.0
>
> Attachments: 3373.txt, HbaseBalancerTest2.java
>
>
> From our experience, cluster can be well balanced and yet, one table's regions may be badly concentrated on few region servers.
> For example, one table has 839 regions (380 regions at time of table creation) out of which 202 are on one server.
> It would be desirable for load balancer to distribute regions for specified tables evenly across the cluster. Each of such tables has number of regions many times the cluster size.
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