[
https://issues.apache.org/jira/browse/HBASE-15504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15205628#comment-15205628
]
Guanghao Zhang commented on HBASE-15504:
----------------------------------------
And when use StochasticLoadBalancer in our test cluster, we found some other
problems which need to fix.
1. LocalityBasedCandidateGenerator.getLowestLocalityRegionOnServer should skip
region which have nothing.
2. When use LocalityBasedCandidateGenerator to generate Cluster.Action, it
should add random operation instead of pickLowestLocalityServer(cluster).
Because the search function may stuck here if it always generate the same
Cluster.Action.
3. getLeastLoadedTopServerForRegion(int region) should get least loaded server
which have better locality than current server.
> Fix Balancer in 1.3 not moving regions off overloaded regionserver
> ------------------------------------------------------------------
>
> Key: HBASE-15504
> URL: https://issues.apache.org/jira/browse/HBASE-15504
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.3.0
> Reporter: Elliott Clark
> Fix For: 1.3.0
>
>
> We pushed 1.3 to a couple of clusters. In some cases the regions were
> assigned VERY un-evenly and the regions would not move after that.
> We ended up with one rs getting thousands of regions and most servers getting
> 0. Running balancer would do nothing. The balancer would say that it couldn't
> find a solution with less than the current cost.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
