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https://issues.apache.org/jira/browse/HBASE-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737721#action_12737721
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Clint Morgan commented on HBASE-1726:
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To get this migration to work. I need to get a reference to the old HTD which
has the indexes.
Digging around a bit, I don't see where the old HTD's are migrated to the new
HTD format (which droppes the indexes stuff). Where does this happen? Wouldn't
we need a copy of the old HTD to read in the old HTD's bytes.
For my migration, I wrote/ran it against 0.19. Go through all tables, if they
have indexes, move that info into the HTD.values, then HBaseAdmin.modifyTable
to save the HTD. After that, do normal 0.20 migration. Then the migrated
indexes worked. Nothing to migrate to get THBase to work.
> 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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