chamikaramj commented on a change in pull request #14450:
URL: https://github.com/apache/beam/pull/14450#discussion_r609034130



##########
File path: sdks/java/core/src/main/java/org/apache/beam/sdk/io/WriteFiles.java
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@@ -349,15 +326,14 @@ public void validate(PipelineOptions options) {
           getWindowedWrites(),
           "Must use windowed writes when applying %s to an unbounded 
PCollection",
           WriteFiles.class.getSimpleName());
-      // The reason for this is https://issues.apache.org/jira/browse/BEAM-1438
-      // and similar behavior in other runners. Runners can choose to ignore 
this check and perform
-      // runner determined sharding for unbounded data by overriding the option
-      // `withRunnerDeterminedShardingUnboundedInternal`.
-      if (!getWithRunnerDeterminedShardingUnbounded()) {
+      // Sharding used to be required due to 
https://issues.apache.org/jira/browse/BEAM-1438 and
+      // similar behavior in other runners. Some runners may support runner 
determined sharding now.
+      // Check merging window here due to 
https://issues.apache.org/jira/browse/BEAM-12040.
+      if (input.getWindowingStrategy().needsMerge()) {

Review comment:
       @kennknowles is there a better way to do this without regressions and 
without runner specific overrides ?
   
   How about adding overrides to runners that do not support auto-sharding to 
detect this condition and fail early ?




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