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https://issues.apache.org/jira/browse/HBASE-14838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060575#comment-15060575
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Hudson commented on HBASE-14838:
--------------------------------
SUCCESS: Integrated in HBase-1.3-IT #377 (See
[https://builds.apache.org/job/HBase-1.3-IT/377/])
HBASE-14838 Add clarification docs to SimpleRegionNormalizer. (busbey: rev
00805b399f0b953efe510ff3ef8584c39171019b)
*
hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java
> Clarify that SimpleRegionNormalizer does not merge empty (<1MB) regions
> -----------------------------------------------------------------------
>
> Key: HBASE-14838
> URL: https://issues.apache.org/jira/browse/HBASE-14838
> Project: HBase
> Issue Type: Bug
> Components: documentation, regionserver
> Affects Versions: 1.2.0
> Reporter: Romil Choksi
> Assignee: Josh Elser
> Priority: Trivial
> Fix For: 2.0.0, 1.2.0
>
> Attachments: HBASE-14838.patch
>
>
> SImpleRegionNormalizer does not merge empty region of a table
> Steps to repro:
> - Create an empty table with few, say 5-6 regions without any data in any of
> them
> - Verify hbase:meta table to verify the regions for the table or check
> HMaster UI
> - Enable normalizer switch and normalization for this table
> - Run normalizer, by 'normalize' command from hbase shell
> - Verify the regions for table by scanning hbase:meta table or checking
> HMaster web UI
> The empty regions are not merged on running the region normalizer. This seems
> to be an edge case with completely empty regions since the Normalizer checks
> for: smallestRegion (in this case 0 size) + smallestNeighborOfSmallestRegion
> (in this case 0 size) > avg region size (in this case 0 size)
> thanks to [~elserj] for verifying this from the source code side
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