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fix: chunk get together when random rechunk #3205

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fix: chunk get together when random rechunk #3205

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fe1a412
fix: chunk get together when random rechunk
yyy1000 Apr 12, 2023
6103c9b
fix: another mistake and comment
yyy1000 Apr 12, 2023
eb8c472
fix: add small difference
yyy1000 Apr 18, 2023
7dab44d
fix: scala-fmt
yyy1000 Apr 18, 2023
d429186
fix: low version
yyy1000 Apr 18, 2023
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2 changes: 1 addition & 1 deletion core/shared/src/main/scala/fs2/Stream.scala
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Expand Up @@ -2413,7 +2413,7 @@ final class Stream[+F[_], +O] private[fs2] (private[fs2] val underlying: Pull[F,
Pull.output(acc) >> go(hd, size, tl)
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I think this is another error. The size should ideally be the desired size of the next output chunk, but that is the one being emited in acc. Instead should be -1, so that the next iteration recomputes a new size based on the first chunk of tl.

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Yes! I realize it now.

else {
val (out, rem) = acc.splitAt(size - 1)
Pull.output(out) >> go(rem ++ hd, -1, tl)
Pull.output(out) >> go(rem, -1, Pull.output(hd) >> tl)
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Is Pull.output(hd) >> tl equivalent to s?

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Yes. I should change it to s. :) Thanks for that.

}
case None =>
Pull.output(acc)
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7 changes: 7 additions & 0 deletions core/shared/src/test/scala/fs2/StreamSuite.scala
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Expand Up @@ -1031,6 +1031,13 @@ class StreamSuite extends Fs2Suite {
assertEquals(countChunks(source), 2)
}

test("rechunkRandomly sometimes emits everything in a single chunk") {
val fiveChunks = Stream(1) ++ Stream(2) ++ Stream(3) ++ Stream(4) ++ Stream(5)

val source = fiveChunks.rechunkRandomlyWithSeed(0.1, 2.0)(5).chunks.toList
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Also the way factor and nextSize are implemented now, I don't think factor can ever reach maxFactor. So for this example nextSize can only be 0 or 1.

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Yeah, that's true. Now the range is [minFactor, maxFactor).

assert(source.forall(_.size <= 2), "Some Chunks have larger size than maxFactor")
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}

group("Stream[F, Either[Throwable, O]]") {
test(".evalMap(_.pure.rethrow).mask <-> .rethrow.mask") {
forAllF { (stream: Stream[Pure, Int]) =>
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