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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-832) Problem with row keys beginnig with characters < than ',' and the region location cache
Date Thu, 14 Aug 2008 21:05:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622698#action_12622698
] 

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

If region is a 'meta' region, could we write row keys with a subclass of HSK named something
like MetaHSK?  MetaHSK would not treat row as a byte array but instead do simple parse to
pull out the tablename and timestamp components.  Remained would be startkey.  Should be possible
to then do compare that is not susceptible to changed ordering just because startkey contains
delimiter?

Might have to have a version for root and another for meta given that the root has rows made
of the meta tables rows.

> 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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