reuvenlax commented on a change in pull request #15731:
URL: https://github.com/apache/beam/pull/15731#discussion_r737653840



##########
File path: 
runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/DataflowPipelineTranslator.java
##########
@@ -716,13 +716,13 @@ private void addOutput(String name, PValue value, 
Coder<?> valueCoder) {
       translator.registerOutputName(value, name);
 
       // If the output requires runner determined sharding, also append 
necessary input properties.
-      if (value instanceof PCollection
-          && 
translator.runner.doesPCollectionRequireAutoSharding((PCollection<?>) value)) {
-        addInput(PropertyNames.ALLOWS_SHARDABLE_STATE, "true");
-        // Currently we only allow auto-sharding to be enabled through the 
GroupIntoBatches
-        // transform. So we also add the following property which 
GroupIntoBatchesDoFn has, to allow
-        // the backend to perform graph optimization.
-        addInput(PropertyNames.PRESERVES_KEYS, "true");
+      if (value instanceof PCollection) {
+        if 
(translator.runner.doesPCollectionRequireAutoSharding((PCollection<?>) value)) {
+          addInput(PropertyNames.ALLOWS_SHARDABLE_STATE, "true");
+        }
+        if (translator.runner.doesPCollectionPreserveKeys((PCollection<?>) 
value)) {
+          addInput(PropertyNames.PRESERVES_KEYS, "true");

Review comment:
       Yes - would need to separately update for portable.

##########
File path: 
runners/google-cloud-dataflow-java/src/test/java/org/apache/beam/runners/dataflow/DataflowPipelineTranslatorTest.java
##########
@@ -1133,6 +1157,55 @@ private JobSpecification 
runStreamingGroupIntoBatchesAndGetJobSpec(
         pipeline, pipelineProto, sdkComponents, runner, 
Collections.emptyList());
   }
 
+  @Test
+  public void testBatchGroupIntoBatchesTranslation() throws Exception {
+    JobSpecification jobSpec =
+        runBatchGroupIntoBatchesAndGetJobSpec(false, Collections.emptyList());
+    List<Step> steps = jobSpec.getJob().getSteps();
+    Step shardedStateStep = steps.get(steps.size() - 1);
+    Map<String, Object> properties = shardedStateStep.getProperties();
+    assertTrue(properties.containsKey(PropertyNames.PRESERVES_KEYS));
+    assertEquals("true", getString(properties, PropertyNames.PRESERVES_KEYS));
+  }
+
+  @Test
+  public void testBatchGroupIntoBatchesWithShardedKeyTranslation() throws 
Exception {
+    List<String> experiments = Collections.emptyList();
+    JobSpecification jobSpec = runBatchGroupIntoBatchesAndGetJobSpec(true, 
experiments);
+    List<Step> steps = jobSpec.getJob().getSteps();
+    Step shardedStateStep = steps.get(steps.size() - 1);
+    Map<String, Object> properties = shardedStateStep.getProperties();
+    assertTrue(properties.containsKey(PropertyNames.PRESERVES_KEYS));
+    assertEquals("true", getString(properties, PropertyNames.PRESERVES_KEYS));
+  }
+
+  @Test
+  public void testBatchGroupIntoBatchesTranslationUnifiedWorker() throws 
Exception {

Review comment:
       ack




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