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From Dave Barr <dave.b...@gmail.com>
Subject rolling upgrade from 3.3->3.4?
Date Wed, 30 May 2012 00:42:49 GMT
We'd like to upgrade our production ZK quorums to 3.4.

Apart from https://issues.apache.org/jira/browse/ZOOKEEPER-1149, what
issues are there doing a rolling upgrade of ZK nodes from 3.3 to 3.4?
Can a mixed cluster work OK?  I presume to reduce reelections we
should upgrade followers first, then upgrade the leader?  Has anyone
done this?

If this isn't recommended, our only other option is to build a new
quorum and shutdown/switch each service to the new quorum, which is
pretty painful (having done that before).

--Dave

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