aljoscha commented on issue #7649: [FLINK-10944] Increase slot request timout for MiniClusterResource URL: https://github.com/apache/flink/pull/7649#issuecomment-461367699 Both the source and the sink use slot sharing with one of the 4 window-operator slots. This is also the root of the problem: because of some race or quirk the slot sharing doesn't work as it is supposed to and then the physically available 4 slots are not enough. When it says 3 in this log, it means "source and window op 1" in one slot, "window op 2" in another slot. And the two slots of the other TM can't be used for some reason. It's a bit confusing because this thing allocates 6 logical slots (tasks really) to 4 physical slots (actual slots). I know ... 😅
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