On Wed, Aug 2, 2017 at 5:25 PM, Zach York <zyork.contribut...@gmail.com> wrote:
> Do we know what the major pain points for migration are? Can we discuss > that/get a list going? > > Here's a few in outline: + There is issue of formats, of hbase-2.x being able to read hbase-1.x data whether from HDFS or ZooKeeper or off the wire. + An hbase-1.x client should be able to Get/Put and Scan an hbase-2.x cluster; no holes in the API or unintelligible serializations. + There is then the little dance that has us rolling restart from an hbase-1.x cluster to hbase-2.x; i.e. upgrade master first and then it will assign regions to the new hbase-2.x regionservers as they come on line. TBD. Is this what you mean sir? S > I think without that knowledge it is hard (for me at least :) ) to > determine where we should set our sights in terms of migration. > > Thanks, > Zach > > On Wed, Aug 2, 2017 at 4:38 PM, Stack <st...@duboce.net> wrote: > > > What are our expectations regards compatibility between hbase1 and > hbase2? > > > > Lets have a chat about it. Here are some goal posts. > > > > + You have to upgrade to hbase-1.x before you can migrate to hbase-2. No > > migration from < hbase-1 (Is this too onerous? Should we support 0.98 => > > 2.0?). > > + You do NOT have to upgrade to the latest release of hbase1 to migrate > to > > hbase2; being up on hbase-1.0.0+ will be sufficient. > > + You'll have to update your hbase1 coprocessors to deploy them on > hbase2. > > A bunch of CP API has/will change by the time hbase2 comes out; e.g. > > watching for region split on RegionServer no longer makes sense given > > Master runs all splits now. > > + An hbase1 client can run against an hbase2 cluster but it will only be > > able to do DML (Get/Put/Scan, etc.). We do not allow being able to do > admin > > ops using an hbase1 Admin client against an hbase2 cluster. We have some > > egregious API violations in branch-1; e.g. we have protobuf in our API > (See > > HBASE-15607). The notion is that we can't afford a deprecation cycle > > purging this stuff from our Admin API. > > > > What you all think? > > > > St.Ack > > >
