pnowojski commented on code in PR #26619:
URL: https://github.com/apache/flink/pull/26619#discussion_r2115854495
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flink-tests/src/test/java/org/apache/flink/test/streaming/runtime/SinkV2ITCase.java:
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@@ -111,12 +114,13 @@ public void writerAndCommitterExecuteInStreamingMode()
throws Exception {
final Source<Integer, ?, ?> source = createStreamingSource();
env.fromSource(source, WatermarkStrategy.noWatermarks(), "source")
+ .rebalance()
Review Comment:
Can you add comment why `rebalance()` is important here? (that we want to
assert unaligned checkpoints are enabled on the `source -> writer` edge?
Speaking of, probably it would be better to replace `rebalance()` with some
`keyBy`, as AFAIR technically speaking `rebalance()` also doesn't support UC,
but for other reasons?
ditto other places
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