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https://issues.apache.org/jira/browse/STORM-760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14486044#comment-14486044
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Parth Brahmbhatt commented on STORM-760:
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When I tested the rolling upgrade feature I did not upgrade clojure. I built
and deployed a topology on a cluster, rebuilt the storm jar and replaced the
old jar with new jar, bounced nimbus/ui/workers and supervisors and the same
topology was working fine.
But I agree that any kind of dependency change should be rolling upgradable.
> use JSON for conf serialization
> -------------------------------
>
> Key: STORM-760
> URL: https://issues.apache.org/jira/browse/STORM-760
> Project: Apache Storm
> Issue Type: Bug
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
>
> Now that STORM-634 has gone in, the only real place we still use java
> serialization that is not required by the contract with the end user is when
> nimbus writes out the topology conf, and the worker/supervisor tries to read
> it back in. We already write it out using JSON when submitting a topology,
> we should do the same here to avoid rolling upgrade issues, ideally
> compressed to save space too.
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