On Wed, Apr 27, 2011 at 11:08 AM, Dave Latham <[email protected]> wrote: > The HBase book ( http://hbase.apache.org/book/upgrading.html ) states, > >> This version of 0.90.x HBase can be started on data written by HBase 0.20.x >> or HBase 0.89.x. There is no >> need of a migration step. HBase 0.89.x and 0.90.x does write out the name of >> region directories differently -- >> it names them with a md5 hash of the region name rather than a jenkins hash >> -- so this means that once >> started, there is no going back to HBase 0.20.x. > > Does this mean that if we prevent region splits, that it would be > possible to rollback to HBase 0.20.6, or are there other data format > changes that would prevent that? >
This is the only data format change. What you suggest -- preventing new regions being created -- should work but I've not tried it Dave. St.Ack
