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From "stack (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5275) Create migration for hbase-2600 meta table rejigger so regions denoted by end row
Date Tue, 24 Jan 2012 23:20:40 GMT
Create migration for hbase-2600 meta table rejigger so regions denoted by end row
---------------------------------------------------------------------------------

                 Key: HBASE-5275
                 URL: https://issues.apache.org/jira/browse/HBASE-5275
             Project: HBase
          Issue Type: Task
            Reporter: stack


Chatting with Alex, we'd do as was done previous where we'll can data from 0.92 and then have
a test that unbundles this canned data, migrates it and then makes sure all still works. 
Migration test would include verification of idempotency; i.e. if migration fails midway,
we should be able to rerun it.

Canned data should include a meta with splits and WALs to split (migrations usually require
clean shutdown so no WALs should be in place but just in case... And replication is reading
logs)

We were thinking that on startup, we'd check hbase.version file.  If not updated, we'd rewrite
.META. offline before starting up.

In offline mode -- open of the .META. regions -- we'd do a rewrite per row changing the HRegionInfo
version from VERSION=1 to VERSION=2.

VERSION=2 is the new format HRegionInfo.

VERSION=2 will use endrow but it will keep its current encoded  name (though it was generated
with startrow as input) so we don't have to move stuff around in filesystem.

New HRIs subsequent to the migration will be written out as VERSION=3.  A VERSION=3 has endrow
in its name but the encoded name will be made using startrow+endrow+regionid+tablename rather
than just startrow+regionid+tablename as in VERSION=1.

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