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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15547) Balancer should take into account number of PENDING_OPEN regions
Date Mon, 28 Mar 2016 15:22:25 GMT
Sean Busbey created HBASE-15547:

             Summary: 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
            Reporter: Sean Busbey
            Priority: Critical

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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