srdo commented on issue #3034: STORM-3422: TupleCaptureBolt is not thread-safe URL: https://github.com/apache/storm/pull/3034#issuecomment-505580871 I think I like the ListMultiMap approach a little better, since it's not as easy to forget to synchronize a reference to the map. I would also expect there to be some contention on the map field, as it will be updated by every tuple in the local topology. You're right that using a static field for this is a bit hacky. Best alternative I can think of would be creating a field in LocalCluster, and figuring out a way to share it with these bolts. It would probably be more complicated though. Either way, I don't think this is too bad, as the TupleCaptureBolt isn't supposed to be used outside a LocalCluster, and we can make sure to e.g. clear the field between topology submissions. If you can think of a good alternative, I don't think anyone would miss this bolt :)
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