Abacn commented on code in PR #30995:
URL: https://github.com/apache/beam/pull/30995#discussion_r1579967239


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sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigtable/BigtableIO.java:
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@@ -2312,6 +2337,10 @@ public PCollection<KV<ByteString, ChangeStreamMutation>> 
expand(PBegin input) {
       if (getCreateOrUpdateMetadataTable() != null) {
         shouldCreateOrUpdateMetadataTable = getCreateOrUpdateMetadataTable();
       }
+      Duration backlogReplicationAdjustment = 
getBacklogReplicationAdjustment();

Review Comment:
   nullable is fine. For streaming IO a consideration is upgrade compatibility, 
and newly added parameters then need to be nullable and set default in pipeline 
submission



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