He-Pin commented on code in PR #1622:
URL: https://github.com/apache/pekko/pull/1622#discussion_r1894925300
##########
stream/src/main/scala/org/apache/pekko/stream/impl/fusing/FlatMapPrefix.scala:
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@@ -128,8 +129,8 @@ import pekko.util.OptionVal
def materializeFlow(): Unit =
try {
- val prefix = accumulated.toVector
- accumulated.clear()
+ val prefix = builder.result()
+ builder = null // free for GC
Review Comment:
I think the concat should be reimplemented to reduce memory usage somehow.
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