[jira] Commented: (HBASE-832) Problem with row keys beginnig with characters < than ',' and the region location cache

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622654#action_12622654 ] 

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

For 0.2.1, should we add rejecting row if starts with a byte that is <= ','?

My guess is that there is little extant data that has rows with row keys that are <= ',', else we would have heard about it (table wouldn't work).

Minimally, lets add release note that this is a known issue for 0.2.1.

Good find J-D.



> 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
>    Affects Versions: 0.2.0
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.3.0
>
>
> 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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