Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/5125#discussion_r155210751
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/TwoInputStreamTask.java
---
@@ -80,7 +91,10 @@ public void init() throws Exception {
this.headOperator);
// make sure that stream tasks report their I/O statistics
-
inputProcessor.setMetricGroup(getEnvironment().getMetricGroup().getIOMetricGroup());
+
inputProcessor.setupMetrics(getEnvironment().getMetricGroup().getIOMetricGroup(),
input1WatermarkGauge, input2WatermarkGauge);
+
+
headOperator.getMetricGroup().gauge(MetricNames.IO_CURRENT_INPUT_1_WATERMARK,
input1WatermarkGauge);
--- End diff --
however, the separate input1/input2 metrics ignore the
`WatermarkMetricPreference`; as in they are never overridden by the output
metric. (because that is difficult to do in the OperatorChain since there we
have no concept of TwoInputOperators....)
---
