chamikaramj commented on a change in pull request #14450:
URL: https://github.com/apache/beam/pull/14450#discussion_r609038348
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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:
(By "this condition", I mean unbounded writes without num_shards or a
shards provider)
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