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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