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https://issues.apache.org/jira/browse/STORM-760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14483885#comment-14483885
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Robert Joseph Evans commented on STORM-760:
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That is right, LocalState uses java serialization. My only concern is about
what else is stored in the map. We have had cases where local state files
needed to be cleaned out so we could go on. I'll look into seeing if there is
something we can do about that.
> 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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