simingweng commented on issue #3235: fix the issue that Heron ECO stream builder does not handle IStatefulWindowedBolt URL: https://github.com/apache/incubator-heron/pull/3235#issuecomment-482771517 @nwangtw as I mentioned in the previous comment. The code change in this pull request does not completely solve the problem. Even with the fix, the `initState()` and `preSave()` callback are still not invoked for a stateful bolt defined through ECO. But, I do see in the log that the bolt receives checkpoint request from Topology Master. I’ll need to look deeper, but kinda of stuck now. @joshfischer1108 any clue?
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