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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14838) Clarify that SimpleRegionNormalizer does not merge empty (<1MB) regions
Date Wed, 16 Dec 2015 15:57:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060202#comment-15060202
] 

Hudson commented on HBASE-14838:
--------------------------------

SUCCESS: Integrated in HBase-1.2-IT #343 (See [https://builds.apache.org/job/HBase-1.2-IT/343/])
HBASE-14838 Add clarification docs to SimpleRegionNormalizer. (busbey: rev e2d5689e3b0b435aeefb0dafde7f50309e1008fb)
* 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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