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From "Romil Choksi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-16059) Region normalizer failed to trigger merge action where expected
Date Fri, 17 Jun 2016 20:28:05 GMT
Romil Choksi created HBASE-16059:

             Summary: Region normalizer failed to trigger merge action where expected
                 Key: HBASE-16059
                 URL: https://issues.apache.org/jira/browse/HBASE-16059
             Project: HBase
          Issue Type: Bug
          Components: master
            Reporter: Romil Choksi
             Fix For: 2.0.0

Region normalizer failed to trigger merge action where expected

Steps to reproduce:
- Pre-split the test table into 5 regions with keys 1,3,7,8
- Insert some data for each of the split. 27K rows for regions starting with key 1, and 100K
rows for each of the regions with start key 3,7 and 8
- Scan the test table, and verify that these regions exists -  1) STARTKEY => ‘' ENDKEY
=> ’1’  2)  STARTKEY => ’1’ ENDKEY => ’3’
- Turn on normalization, verify normalization switch is enabled and that normalization is
true for test table
- Run normalizer a few times
- Scan test table again, verify that regions don’t exist anymore  1) STARTKEY => ‘'
ENDKEY => ’1’  2)  STARTKEY => ’1’ ENDKEY => ’3’, but instead a new region
is created with  STARTKEY => ’’ ENDKEY => ’3’
The test now fails, with the last step failing at assertion. 

Looking into the Master log, I see that normalization plan was computed for the test table
but it decides that no normalization is needed for the test table, and that the regions look

{code:title = Master.log}
2016-06-17 00:41:46,895 DEBUG [B.defaultRpcServer.handler=4,queue=1,port=20000] normalizer.SimpleRegionNormalizer:
Computing normalization plan for table: table_zrof6ea383, number of regions: 5
2016-06-17 00:41:46,895 DEBUG [B.defaultRpcServer.handler=4,queue=1,port=20000] normalizer.SimpleRegionNormalizer:
Table table_zrof6ea383, total aggregated regions size: 13
2016-06-17 00:41:46,896 DEBUG [B.defaultRpcServer.handler=4,queue=1,port=20000] normalizer.SimpleRegionNormalizer:
Table table_zrof6ea383, average region size: 2.6
2016-06-17 00:41:46,896 DEBUG [B.defaultRpcServer.handler=4,queue=1,port=20000] normalizer.SimpleRegionNormalizer:
No normalization needed, regions look good for table: table_zrof6ea383

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