Github user uce commented on a diff in the pull request: https://github.com/apache/flink/pull/3128#discussion_r97319035 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/metrics/dump/MetricDumpSerialization.java --- @@ -50,12 +51,27 @@ private MetricDumpSerialization() { } + public static class MetricSerializationResult { --- End diff -- This is not `Serializable` and would fail when send with Akka. The following test fails: ```java @Test public void testJavaSerialization() throws IOException { MetricDumpSerialization.MetricDumpSerializer serializer = new MetricDumpSerialization.MetricDumpSerializer(); final ByteArrayOutputStream bos = new ByteArrayOutputStream(1024); final ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(serializer.serialize( new HashMap<Counter, Tuple2<QueryScopeInfo,String>>(), new HashMap<Gauge<?>, Tuple2<QueryScopeInfo,String>>(), new HashMap<Histogram, Tuple2<QueryScopeInfo,String>>(), new HashMap<Meter, Tuple2<QueryScopeInfo,String>>())); } ```
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