Manual schema changes via one-off shell scripts.
What I would like to do is write code that gets the HTD, checks if all of the schema structure and features are as they should be, and, if not, makes the necessary modifications without taking the table offline.(I typically write code like that which does offlining first. In practice, it creates the table if it is missing in some test environment, later it is disabled.) It could be possible to update HTD and HCD attributes without offlining, possibly even to add CFs. I wouldn't expect all admin actions could be accomplished without offlining. Best regards, - Andy Problems worthy of attack prove their worth by hitting back. - Piet Hein (via Tom White) ----- Original Message ----- > From: Ian Varley <[email protected]> > To: "[email protected]" <[email protected]> > Cc: > Sent: Monday, April 9, 2012 9:08 AM > Subject: Schema Updates: what do you do today? > > All: > > I'm doing a little research into various ways to apply schema modifications > to an HBase cluster. Anybody care to share with the list what you currently > do? > E.g. > > - Connect via the HBase shell and manually issue commands ("create", > "disable", "alter", etc.) > - Write one-off scripts that do the above > - Write tools that read from a static schema definition and then apply > changes > to a cluster (e.g. using HBaseAdmin) > > etc. My supposition is that some additional tooling in this area, to > consolidate > stuff everybody already does on their own, might be helpful. In light of > recent > discussions on the dev list about various ways to alter the schema on a > running > cluster, it seems like this area is still a bit of a "wild west" in > the HBase community, both in how HBase works and in what people do in > practice. > > What do you do today for schema changes, and what would you like to do in an > ideal world? > > Thanks, > Ian >
