y1chi commented on a change in pull request #15137:
URL: https://github.com/apache/beam/pull/15137#discussion_r672644789
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File path: model/pipeline/src/main/proto/beam_runner_api.proto
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@@ -939,6 +939,31 @@ message StandardCoders {
// Experimental.
STATE_BACKED_ITERABLE = 9 [(beam_urn) =
"beam:coder:state_backed_iterable:v1"];
+
+ // Encodes an arbitrary user defined window and its max timestamp
(inclusive).
+ // The encoding format is:
+ // maxTimestamp window
Review comment:
I think whether it should be length prefixed can be determined by runner
with coder overwrite, since we are not limiting the wrapped window coder type,
known coder can be also used(though it is unlikely in real use case, but it is
handy for unit tests) which don't need length prefix.
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