chore: send eot response for batchmap operations

src/main/java/io/numaproj/numaflow/batchmapper/Service.java

@@ -146,6 +146,11 @@ private void buildAndStreamResponse(
                     .build();
             responseObserver.onNext(singleRequestResponse);
         });
+        // Send an EOT message to indicate the end of the transmission for the batch.
+        MapOuterClass.MapResponse eotResponse = MapOuterClass.MapResponse
+                .newBuilder()
+                .setStatus(MapOuterClass.Status.newBuilder().setEot(true).build()).build();
+        responseObserver.onNext(eotResponse);
         responseObserver.onCompleted();
     }
 

src/main/proto/map/v1/map.proto

@@ -26,9 +26,6 @@ message MapRequest {
     google.protobuf.Timestamp watermark = 4;
     map<string, string> headers = 5;
   }
-  message Status {
-    bool eot = 1;
-  }
   Request request = 1;
   // This ID is used to uniquely identify a map request
   string id = 2;
@@ -44,6 +41,13 @@ message Handshake {
   bool sot = 1;
 }
 
+/*
+ * Status message to indicate the status of the message.
+ */
+message Status {
+  bool eot = 1;
+}
+
 /**
  * MapResponse represents a response element.
  */
@@ -57,6 +61,7 @@ message MapResponse {
   // This ID is used to refer the responses to the request it corresponds to.
   string id = 2;
   optional Handshake handshake = 3;
+  optional Status status = 4;
 }
 
 /**

src/test/java/io/numaproj/numaflow/batchmapper/ServerErrTest.java

@@ -127,7 +127,7 @@ public void testErrorFromUDF() {
         inputStreamObserver.onNext(request);
         inputStreamObserver.onNext(MapOuterClass.MapRequest
                 .newBuilder()
-                .setStatus(MapOuterClass.MapRequest.Status.newBuilder().setEot(true))
+                .setStatus(MapOuterClass.Status.newBuilder().setEot(true))
                 .build());
         inputStreamObserver.onCompleted();
         try {

src/test/java/io/numaproj/numaflow/batchmapper/ServerTest.java

@@ -63,7 +63,7 @@ public void tearDown() throws Exception {
 
     @Test
     public void testBatchMapHappyPath() {
-        BatchMapOutputStreamObserver outputStreamObserver = new BatchMapOutputStreamObserver(11);
+        BatchMapOutputStreamObserver outputStreamObserver = new BatchMapOutputStreamObserver(12);
         StreamObserver<MapOuterClass.MapRequest> inputStreamObserver = MapGrpc
                 .newStub(inProcessChannel)
                 .mapFn(outputStreamObserver);
@@ -90,7 +90,7 @@ public void testBatchMapHappyPath() {
 
         inputStreamObserver.onNext(MapOuterClass.MapRequest
                 .newBuilder()
-                .setStatus(MapOuterClass.MapRequest.Status.newBuilder().setEot(true))
+                .setStatus(MapOuterClass.Status.newBuilder().setEot(true))
                 .build());
         inputStreamObserver.onCompleted();
 
@@ -100,7 +100,7 @@ public void testBatchMapHappyPath() {
             fail("Error in getting done signal from the observer " + e.getMessage());
         }
         List<MapOuterClass.MapResponse> result = outputStreamObserver.getMapResponses();
-        assertEquals(11, result.size());
+        assertEquals(12, result.size());
 
         // first response is handshake
         assertTrue(result.get(0).hasHandshake());