pnowojski commented on a change in pull request #13234:
URL: https://github.com/apache/flink/pull/13234#discussion_r494813570



##########
File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/MultipleInputStreamTask.java
##########
@@ -53,42 +53,48 @@ public void init() throws Exception {
                StreamConfig configuration = getConfiguration();
                ClassLoader userClassLoader = getUserCodeClassLoader();
 
-               TypeSerializer<?>[] inputDeserializers = 
configuration.getTypeSerializersIn(userClassLoader);
+               StreamConfig.Input[] inputs = 
configuration.getInputs(userClassLoader);
 
-               ArrayList<IndexedInputGate>[] inputLists = new 
ArrayList[inputDeserializers.length];
-               WatermarkGauge[] watermarkGauges = new 
WatermarkGauge[inputDeserializers.length];
+               ArrayList<IndexedInputGate>[] inputLists = new ArrayList[
+                       (int) Arrays.stream(inputs)
+                               .filter(input -> (input instanceof 
StreamConfig.NetworkInput))
+                               .count()];

Review comment:
       @rkhachatryan updated answer to your question:
   
   https://issues.apache.org/jira/browse/FLINK-19411
   
   no it isn't the same :( `configuration.getNumberOfNetworkInputs` returns the 
number of input gates of the task, ignoring if they are unioned or not.

##########
File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/MultipleInputStreamTask.java
##########
@@ -53,42 +53,48 @@ public void init() throws Exception {
                StreamConfig configuration = getConfiguration();
                ClassLoader userClassLoader = getUserCodeClassLoader();
 
-               TypeSerializer<?>[] inputDeserializers = 
configuration.getTypeSerializersIn(userClassLoader);
+               StreamConfig.Input[] inputs = 
configuration.getInputs(userClassLoader);
 
-               ArrayList<IndexedInputGate>[] inputLists = new 
ArrayList[inputDeserializers.length];
-               WatermarkGauge[] watermarkGauges = new 
WatermarkGauge[inputDeserializers.length];
+               ArrayList<IndexedInputGate>[] inputLists = new ArrayList[
+                       (int) Arrays.stream(inputs)
+                               .filter(input -> (input instanceof 
StreamConfig.NetworkInput))
+                               .count()];

Review comment:
       Updated answer @rkhachatryan, [no it's not the 
same](https://issues.apache.org/jira/browse/FLINK-19411) :(




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