Romil Choksi created HBASE-14867:
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Summary: SimpleRegionNormalizer needs to have better heuristics to
trigger merge operation
Key: HBASE-14867
URL: https://issues.apache.org/jira/browse/HBASE-14867
Project: HBase
Issue Type: Bug
Components: master
Affects Versions: 1.2.0
Reporter: Romil Choksi
SimpleRegionNormalizer needs to have better heuristics to trigger merge
operation. SimpleRegionNormalizer is not able to trigger a merge action if the
table's smallest region has neighboring regions that are larger than table's
average region size, whereas there are other smaller regions whose combined
size is less than the average region size.
For example,
- Consider a table with six region, say r1 to r6.
- Keep r1 as empty and create some data say, 100K rows of data for each of the
regions r2, r3 and r4. Create smaller amount of data for regions r5 and r6, say
about 27K rows of data.
- Run the normalizer. Verify the number the regions for that table and also
check the master log to see if any merge action was triggered as a result of
normalization.
In such scenario, it would be better to have a merge action triggered for those
two smaller regions r5 and r6 even though either of them is not the smallest one
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