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https://issues.apache.org/jira/browse/HBASE-2233?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-2233:
-------------------------

    Attachment: 2233-v2.txt

Here is something that actually compiles against 0.22.  Doesn't work though 
yet.  I'm working through the unit tests.  Has hackups to get around changes in 
hadoop API including switch to use hadoop's TOP if suitable one is available 
and removal from RPC of user passing since its Type changed across Hadoop 
versions (and Gary's security work does this stuff for us -- no need to do it 
here in plain-hbase).

> Support both Hadoop 0.20, 0.21, and 0.22
> ----------------------------------------
>
>                 Key: HBASE-2233
>                 URL: https://issues.apache.org/jira/browse/HBASE-2233
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Jean-Daniel Cryans
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: 2233-v2.txt, 2233.txt, pom.to.go.against.hadoop.trunk.txt
>
>
> Since Hadoop 0.21 isn't going to be well supported and that a lot of users 
> may wish to stick on 0.20, the next HBase major release should support both 
> 0.20 and 0.21. 
> HDFS-265 support will be swapped for HDFS-200 if running on HDFS 0.20. A 
> cluster without that patchset shouldn't be supported.

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