[jira] [Created] (HBASE-15547) Balancer should take into account number of PENDING_OPEN regions

["Sean Busbey (JIRA)" <ji...@apache.org>]

Sean Busbey created HBASE-15547:
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             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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