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Date: Wed, 27 Aug 2008 17:17:44 -0700 (PDT)
From: "stack (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-832) Problem with row keys beginnig with
 characters < than ',' and the region location cache
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    [ https://issues.apache.org/jira/browse/HBASE-832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12626384#action_12626384 ] 

stack commented on HBASE-832:
-----------------------------

J-D: One thing to keep in mind is that going between 0.2.0 and 0.2.1, a migration should not be necessary.  I'm afraid that changing format of key in meta will require migration.

> Problem with row keys beginnig with characters < than ',' and the region location cache
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-832
>                 URL: https://issues.apache.org/jira/browse/HBASE-832
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: client, regionserver
>    Affects Versions: 0.2.0
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>            Priority: Blocker
>             Fix For: 0.2.1, 0.18.0
>
>
> We currently have a problem the way we design .META. row keys. When user table row keys begin with characters lesser than ',' like a '$', any operation will fail when:
> - A client has a certain set of regions in cache
> - One region with the faulty row key splits 
> - The client receives a request for a row in the split region
> The reason is that it will first get a NSRE then it will try to locate a region using the passed row key. For example: 
> Row in META: entities,,1216750777411
> Row passed: entities,$-94f9386f-e235-4cbd-aacc-37210a870991,99999999999999
> The passed row is lesser then the row in .META.

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