boyuanzz commented on a change in pull request #13805:
URL: https://github.com/apache/beam/pull/13805#discussion_r568869083



##########
File path: 
runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/DataflowRunner.java
##########
@@ -1365,21 +1365,27 @@ void 
addPCollectionRequiringIndexedFormat(PCollection<?> pcol) {
   }
 
   void maybeRecordPCollectionWithAutoSharding(PCollection<?> pcol) {
-    if (hasExperiment(options, "beam_fn_api")) {
+    if (!options.isEnableStreamingEngine()) {
       LOG.warn(
-          "Runner determined sharding not available in Dataflow for 
GroupIntoBatches for portable "
-              + "jobs. Default sharding will be applied.");
+          "Runner determined sharding not available in Dataflow for 
GroupIntoBatches for "
+              + "non-Streaming Engine jobs. Default sharding will be 
applied.");
       return;
     }
-    if (!options.isEnableStreamingEngine()) {
+    if (!hasExperiment(options, "enable_streaming_auto_sharding")) {
       LOG.warn(
-          "Runner determined sharding not available in Dataflow for 
GroupIntoBatches for Streaming "
-              + "Appliance jobs. Default sharding will be applied.");
+          "Runner determined sharding not enabled in Dataflow for 
GroupIntoBatches for Streaming "
+              + "Engine jobs: --enable_streaming_auto_sharding=false. Default 
sharding will be "
+              + "applied.");
       return;
     }
-    if (hasExperiment(options, "enable_streaming_auto_sharding")) {
-      pcollectionsRequiringAutoSharding.add(pcol);
+    if (hasExperiment(options, "beam_fn_api") && !hasExperiment(options, 
"use_runner_v2")) {
+      LOG.warn(
+          "Runner determined sharding not available in Dataflow for 
GroupIntoBatches for portable "
+              + "jobs not using runner v2: --beam_fn_api=true, 
--use_runner_v2=false. Default "
+              + "sharding will be applied.");
+      return;

Review comment:
       I would prefer rejecting the pipeline since it's also bad when customer 
expects autosharding but it's not.




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