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https://issues.apache.org/jira/browse/HBASE-62?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12610376#action_12610376
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stack commented on HBASE-62:
----------------------------
Thanks for new patch Andrew.
I've been playing around with the migration. Its that old story where you need
the old class around to deserialize but the new class is in the way. I've
started up a little package under o.a.h.h.util named migration.v4. In it,
I'll add classes need to do the v3 to v4 migration. WIll need to iterate over
all .META. regions using new tools I need to add to MetaUtils. Will get the
info:regioninfo column bytes and feed them to a subclass of HRI, one that has a
diffferent deserializer. This new deserializer inserts a subclass of HTD that
also has a different deserializer, one that can read v3 HTDs. It copies the v3
to a v4 HTD. Then we call the default HRI serializer -- which will invoke the
v4 HTD serializer -- and insert back into .META.
One hiccup is that we might have to do the v4 migration ahead of the v3
migration in tests.
I'm a little worried that subclassing HRI and HTD in migration is too brittle.
Will think on it over the w/e.
> [hbase] Allow user add arbitrary key/value pairs to table and column
> descriptors
> --------------------------------------------------------------------------------
>
> Key: HBASE-62
> URL: https://issues.apache.org/jira/browse/HBASE-62
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: stack
> Assignee: Andrew Purtell
> Priority: Trivial
> Attachments: hbase-62-r673137.patch, hbase-62-r673264.patch,
> hbase-62-r673356.patch
>
>
> Folks have asked if they can tag columns and tables with markings of their
> own designation. Examples include 'type' and 'descriptiion'.
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