​Hi all,

We’re planning a big upgrade from 0.9.0.1 to 0.11.  As part of this
upgrade, we’ll be replacing the all the hardware in the cluster.

We are considering doing this as follows:  One by one, we’d shut down an
original broker machine, and then start up a broker​ on a new node with the
same broker.id as the one just shutdown.  I believe that this would cause
the newly started broker to replicate all of its partitions from the other
brokers.  If needed, we could also copy over the original broker log dirs
before starting up the new broker.

Would this work as I expect it to?  Is there anything I’m missing?  Are
there gotchas related with on disk log file formats that might cause some
issues?

Thanks!
- Andrew Otto
  Systems Engineer, Wikimedia Foundation

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