Github user GJL commented on a diff in the pull request: https://github.com/apache/flink/pull/5236#discussion_r159461777 --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/HeapInternalTimerService.java --- @@ -442,23 +458,15 @@ public int numEventTimeTimers() { } public int numProcessingTimeTimers(N namespace) { - int count = 0; - for (InternalTimer<K, N> timer : processingTimeTimersQueue) { - if (timer.getNamespace().equals(namespace)) { - count++; - } - } - return count; + return processingTimeNumberTimers.column(namespace).keySet().stream() --- End diff -- How about something like: ``` public int numProcessingTimeTimers(N namespace) { return processingTimeNumberTimers.column(namespace) .entrySet() .stream() .mapToInt(Map.Entry::getValue) .sum(); } ``` It avoids the additional key lookup in `mapToInt`
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