arunpandianp commented on code in PR #40543:
URL: https://github.com/apache/beam/pull/40543#discussion_r4559492447


##########
sdks/java/core/src/main/java/org/apache/beam/sdk/io/WriteFiles.java:
##########
@@ -579,6 +610,22 @@ public WriteFilesResult<DestinationT> 
expand(PCollection<UserT> input) {
         (getComputeNumShards() == null) ? null : 
input.apply(getComputeNumShards());
 
     boolean fixedSharding = getComputeNumShards() != null || 
getNumShardsProvider() != null;
+    Long directWriteThreshold = getDirectWriteByteThreshold();
+    if (directWriteThreshold != null
+        && getSideInputs().isEmpty()
+        && input.isBounded() == IsBounded.UNBOUNDED) {

Review Comment:
   We should disable direct write when the window is merging like in 
https://github.com/tejasiyer-dev/beam/blob/b1fe445521135fe623ef2d69ae1dd11361dbf1e4/sdks/java/core/src/main/java/org/apache/beam/sdk/io/WriteFiles.java#L573
   
   when directWriteThreshold is present and if we are not enabling it, should 
we throw an error or fallback? When falling back adding a log saying direct 
write is disabled with a reason would be nice to have.



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