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Date: Thu, 3 Aug 2017 02:52:00 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12953976.1459178497000.80450.1501728720312@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-15547) Balancer should take into account
 number of PENDING_OPEN regions
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archived-at: Thu, 03 Aug 2017 02:52:04 -0000


    [ https://issues.apache.org/jira/browse/HBASE-15547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16112092#comment-16112092 ] 

stack commented on HBASE-15547:
-------------------------------

Removing 2.0.0. Assign is different in 2.0.0. No PENDING_OPEN state for instance.

> 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: 1.5.0
>
>
> 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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