srdo commented on issue #2939: STORM-3315: Upgrade to Kryo 4 URL: https://github.com/apache/storm/pull/2939#issuecomment-461429176 I think making an automated test for this would be a big hassle. The test would need to download Storm 1.2.2 (or some other version using Kryo 3), and set it up in a cluster with a build of the current Storm version. We'd then need to run something like our integration test, and scan the logs for errors. Regarding how I decided which changes to make for Kryo 4, I'm just trusting the Kryo 4 release notes, which indicates that Kryo 3 and 4 are compatible if you set `setOptimizedGenerics(true)` (see https://github.com/EsotericSoftware/kryo/releases/tag/kryo-parent-4.0.0)
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