Sent out a PR for this: https://github.com/apache/bookkeeper/pull/1115
Please take a look. - Sijie On Thu, Feb 1, 2018 at 2:50 PM, Sijie Guo <guosi...@gmail.com> wrote: > > On Thu, Feb 1, 2018 at 2:22 PM Enrico Olivelli <eolive...@gmail.com> > wrote: > >> Il gio 1 feb 2018, 22:43 Ivan Kelly <iv...@apache.org> ha scritto: >> >> > > well I don't think it is an easy effort to upgrade from flat ledger >> > manager >> > > to hierarchical ledger manager. There was a huge long discussion about >> > this >> > > migration 2-3 years ago. >> > >> >> I remember one of my first questions as an user was about migrating away >> from FlatLM. We did not finish and so for some cases my customers decided >> to nuke the cluster and start a new one. >> >> >> > Do you recall where the discussion was? JIRA or ML? Superficially it >> > seems like a simple operation if the cluster is taken down while it is >> > happening. >> > >> >> Sijie, >> I have tens of running BK clusters of my customers which are using FlatLM >> because it is the default. Most of them are very little clusters with 3 >> bookies. > > > > > >> >> So I am ok with this move but I need a tool to migrate. > > > We will not remove this class. But the default value will be flipped to > hierarchical. We will provide the tool if we decide to drop it in future. > But probably not at this moment. If anyone in the community has the time to > work on this, it would be great as well! > > >> >> Having the full cluster down can be a option for my cases so I think my >> customers will be happy even with a simple tool. >> >> Maybe we can have a tool which creates a new structure using a different >> base path so that is case of failure the cluster is not compromised. > > > Yes if downtime is acceptable, the solution will be easy, otherwise it is > going to be very complicated to support live migration. > > Sijie > > >> >> Enrico >> >> >> > -Ivan >> > >> >> >> -- >> >> >> -- Enrico Olivelli >> >
