#77 SpliteratorUtils#limit for parallel stream

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ranides4 年之前創建 · 2 條評論
ranides commented 4 年之前

Parallel stream limit has undefined behaviour.

Probably "stop condition" won't work at all, because parallel threads wont even notice, that some thread rejected some value. At this moment LimitSpliterator is not prepared for parallel executions at all: it uses default split method which buffers results.

Parallel stream limit has undefined behaviour. Probably "stop condition" won't work at all, because parallel threads wont even notice, that some thread rejected some value. At this moment LimitSpliterator is not prepared for parallel executions at all: it uses default split method which buffers results.
ranides commented 3 年之前
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To be honest, our current, default method "trySplit" uses condition all the time and preserves condition?

To be honest, our current, default method "trySplit" uses condition all the time and preserves condition?
ranides3 年之前 關閉
ranides 在代碼提交 3 年之前 中引用了該問題
ranides commented 3 年之前
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bulshit, not a bug.

It works perfectly for parallel list, and hashset, and even IntStream. I have no idea what should be done to generate wrong results.

Spliterator has well defined contract and default implementation of LimitSpliterator gives perfect semantic although limited paralelization.

Limited paralelization means that "filtering" is done internally in single thread, but all other pipeline steps are still parallel. In fact that's exactly what we want to achieve.

bulshit, not a bug. It works perfectly for parallel list, and hashset, and even IntStream. I have no idea what should be done to generate wrong results. Spliterator has well defined contract and default implementation of LimitSpliterator gives perfect semantic although limited paralelization. Limited paralelization means that "filtering" is done internally in single thread, but all other pipeline steps are still parallel. In fact that's exactly what we want to achieve.
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