Hi, You can probably do this manually now, but I'll let someone else comment on this.
In 3.5.0 release (with ZK-107 in) you will be able to turn observers into leader + followers and vise versa by running a simple zookeeper command. But unfortunately not in the scenario you described. In your scenario, there are two possible problems that make it unsafe to reconfigure: - it possible that the connection between the datacenters is down and not DC1, and therefore if DC2 independently decides to start leading we may have "split brain" - both quorums will be independently processing and committing operations. - it is very possible that DC1 is down but managed to commit things before it went down which are unknown to DC2, and therefore if we activate DC2 we'll loose committed state. You will only be able to reconfigure if a quorum (majority) of the old configuration and a quorum of the new configuration are up and connected to the current leader. Alex On Thu, Feb 7, 2013 at 4:24 AM, Kuba Lekstan <[email protected]> wrote: > Hello > > I'm considering situation when I have 2 data centers, In 1s DC I'm having > leader + followers, in 2nd only observers. > In case when my 1st DC goes down, can I somehow reconfigure observers in > 2nd DC to leader+followers? > > From what I found out the observers doesn't get transaction logs from the > leader, is there any option I could set to change this behavior? > > Thanks. >
