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Date: Thu, 30 Jul 2009 16:13:15 -0700 (PDT)
From: "stack (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-1726) Migration to 0.20 looses index
 information from HTableDescriptor
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    [ https://issues.apache.org/jira/browse/HBASE-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737350#action_12737350 ] 

stack commented on HBASE-1726:
------------------------------

Good idea Andrew.  Would call each contrib in turn at various stages: before, during, after.  Lets make an issue but not bother with dev. till needed (smile).

In this case, change should be part of the core migration since transaction was core in 0.19.

So, Clint, with this fix, you were able to migrate a 0.19 THBase to 0.20?  If so, update the wiki where it says we don't migrate THBase nor ITHBase.

You'd patch http://svn.apache.org/viewvc/hadoop/hbase/trunk/src/java/org/apache/hadoop/hbase/util/Migrate.java?revision=797273.  See migrate6to7.  You'd probably want to patch the rewriteHRegionInfo method.

> Migration to 0.20 looses index information from HTableDescriptor
> ----------------------------------------------------------------
>
>                 Key: HBASE-1726
>                 URL: https://issues.apache.org/jira/browse/HBASE-1726
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: contrib
>            Reporter: Clint Morgan
>             Fix For: 0.20.0
>
>
> In 0.19 index info was stored as a private field, and written specially in the Writable impl of HTD. In 0.20 it is stored in the general values map under the key "INDEXES". So migration needs to read in the old HTD format, and store the indexes in the values map. I wrote a quick standalone thing to do this. Can someone point me where to plug this into general migration process?

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