Github user StephanEwen commented on a diff in the pull request: https://github.com/apache/flink/pull/210#discussion_r23081083 --- Diff: flink-java/src/main/java/org/apache/flink/api/java/Utils.java --- @@ -32,4 +38,44 @@ public static String getCallLocationName(int depth) { } return st[depth].toString(); } + + protected static class CountHelper<T> extends RichFlatMapFunction<T, Long> { + + private static final long serialVersionUID = 1L; + + private final String id; + + public CountHelper(String id) { + this.id = id; + } + + @Override + public void flatMap(T value, Collector<Long> out) throws Exception { + getRuntimeContext().getLongCounter(id).add(1L); --- End diff -- I think it is more efficient to have a `long`inside this function that is incremented for each record, and then aggregate this `long` to the accumulator in the `close()` method.
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