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https://issues.apache.org/jira/browse/HADOOP-2493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559230#action_12559230
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stack commented on HADOOP-2493:
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Patch is missing test. Otherwise +1. Looks good.
> hbase will split on row when the start and end row is the same cuase data loss
> ------------------------------------------------------------------------------
>
> Key: HADOOP-2493
> URL: https://issues.apache.org/jira/browse/HADOOP-2493
> Project: Hadoop
> Issue Type: Bug
> Components: contrib/hbase
> Reporter: Billy Pearson
> Assignee: Bryan Duxbury
> Priority: Critical
> Fix For: 0.16.0
>
> Attachments: 2493-v2.patch, 2493-v3.patch, 2493.patch,
> regions_shot.JPG
>
>
> While testing hbase splits with my code I was loading a table to become a
> inverted index on some links
> I was using the anchor text as the row key
> and the column parent:child as
> url:(siteurl) and the data is the count of the links pointing to the siteurl
> with row key anchor text.
> but a lot of sites have image links and I use "image" as the anchor text for
> my testing code so there is a lot of image links.
> I changed the max file size of hbase to 16mb for testing and have been able
> to recreate the same error.
> When the table get big it splits on the column image as the end key for one
> table and the start of the next table later it splits to where the start key
> and end key was image for one of the splits. After that it keep spiting the
> region with start key as "image" and the end key the same. So I have multi
> splits with start key and end key as "image" unless the master keeps track of
> the row key and partend:child data on the splits I do not thank all the data
> will get returned when querying it.
> I have attached a screen shot of my regions i thank there should be some
> logic to where if the start and end row key is the same the region does not
> split or we need to start keeping track of the start key, column data on the
> master of each split so we can know where each row is in the database.
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