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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