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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15547) Balancer should take into account number of PENDING_OPEN regions
Date Tue, 29 Mar 2016 22:02:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15216926#comment-15216926
] 

Heng Chen commented on HBASE-15547:
-----------------------------------

Should balance policy take a bug (at least "RS not open regions" looks like a bug ) into account?
 

> Balancer should take into account number of PENDING_OPEN regions
> ----------------------------------------------------------------
>
>                 Key: HBASE-15547
>                 URL: https://issues.apache.org/jira/browse/HBASE-15547
>             Project: HBase
>          Issue Type: Improvement
>          Components: Balancer, Operability, Region Assignment
>    Affects Versions: 0.98.0, 1.0.0
>            Reporter: Sean Busbey
>            Priority: Critical
>             Fix For: 2.0.0, 1.4.0
>
>
> We recently had a cluster get into a bad state where a subset of region servers consistently
could not open new regions (but could continue serving the regions they already hosted).
> Recovering the cluster was just a matter of restarting region servers in sequence. However,
this led to things getting substantially worse before they got better since the bulk assigner
continued to place an uniform number of recovered regions across all servers, including onto
those that could not open regions.
> It would be useful if the balancer could penalize regionservers with a backlog of pending_open
regions and place more work on those regionservers that are properly serving.



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