private void prefetchOnTrigger( final ReduceFn<K, InputT, OutputT, W>.Context directContext, ReduceFn<K, InputT, OutputT, W>.Context renamedContext) { paneInfoTracker.prefetchPaneInfo(directContext); watermarkHold.prefetchExtract(renamedContext); nonEmptyPanes.isEmpty(renamedContext.state()).readLater(); reduceFn.prefetchOnTrigger(directContext.state()); }