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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2016/02/10 19:42:18 UTC

[jira] [Created] (HBASE-15249) Provide lower bound on number of regions in region normalizer for pre-split tables

Ted Yu created HBASE-15249:
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             Summary: Provide lower bound on number of regions in region normalizer for pre-split tables
                 Key: HBASE-15249
                 URL: https://issues.apache.org/jira/browse/HBASE-15249
             Project: HBase
          Issue Type: Bug
            Reporter: Ted Yu
            Assignee: Ted Yu


AMS (Ambari Metrics System) developer found the following scenario:

Metrics table was pre-split with many regions on large cluster.
After some time, AMS stopped working because region normalizer merged the regions into few big regions which were not able to serve high read / write load.

We should consider setting reasonable lower bound on region count.
If the table is pre-split, we can use initial region count as the lower bound.



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