chamikaramj commented on a change in pull request #11122: [BEAM-9346] Improve
the efficiency of TFRecordIO
URL: https://github.com/apache/beam/pull/11122#discussion_r395658938
##########
File path: sdks/java/core/src/main/java/org/apache/beam/sdk/io/WriteFiles.java
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@@ -410,13 +412,44 @@ private GatherResults(Coder<ResultT> resultCoder) {
} else {
// Pass results via a side input rather than reshuffle, because we
need to get an empty
// iterable to finalize if there are no results.
- return input
- .getPipeline()
- .apply(Reify.viewInGlobalWindow(input.apply(View.asList()),
ListCoder.of(resultCoder)));
+ return input.apply("ToList", Combine.globally(new
ToListCombineFn<>()));
Review comment:
Thanks. Agree with Luke. Combine globally has shuffle (GBK) inside hence
breaks above statements. This could be a regression at least for Dataflow when
there are no outputs. We should try following cases.
(1) Dataflow (and possibly other runners may have similar regressions ?)
with an empty output.
(2) Writing using a non-global window while WriteFiles.withWindowedWrites()
not set.
Luke, does that make sense ? Anything else to try out to make sure there's
no regression here ?
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