Jay Kreps created KAFKA-2956:
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Summary: Upgrade section of the docs is still a bit anemic
Key: KAFKA-2956
URL: https://issues.apache.org/jira/browse/KAFKA-2956
Project: Kafka
Issue Type: Improvement
Affects Versions: 0.9.0.0
Reporter: Jay Kreps
Upgrades are pretty touchy since one wrong move can really mess up your
cluster. We want to give people all the info about how to do this safely so
that they do do it (we've historically had people lagging on version for a very
long time, mostly out of fear).
Here is some of the obvious missing stuff:
1. Break out the two cases of "rolling upgrade" vs "downtime upgrade" most
people will be doing both. We have both but they should each have their own
section.
2. What about clients? Do they need to go first? Second? What about non-java
clients?
3. What about mirroring? Can old clusters mirror to new clusters? Can new
clusters mirror to old clusters? Do the servers need to upgrade first or the
mirror makers?
Basically it would be good to really walk people through this step by step so
that they get in the habit of doing it.
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