TheNeuralBit commented on a change in pull request #11532:
URL: https://github.com/apache/beam/pull/11532#discussion_r427566080



##########
File path: 
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/SpannerIO.java
##########
@@ -1066,7 +1079,12 @@ public SpannerWriteResult 
expand(PCollection<MutationGroup> input) {
                               spec.getBatchSizeBytes(),
                               spec.getMaxNumMutations(),
                               spec.getMaxNumRows(),
-                              spec.getGroupingFactor(),
+                              // Do not group on streaming unless explicitly 
set.
+                              spec.getGroupingFactor()
+                                  .orElse(
+                                      input.isBounded() == IsBounded.BOUNDED

Review comment:
       > They already can set groupingFactorb to 1 if they want...
   
   Ha yeah sorry that was unclear. At the time I thought that groupingFactor = 
1 enabled the optimization in https://github.com/apache/beam/pull/11529, so I 
was wondering if this was really necessary since users could just enable them 
by setting grouping factor manually. But I see now that grouping is separate 
from batching. And its disabling batching that enables your other PR.
   
   




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