#77 SpliteratorUtils#limit for parallel stream

已关闭
ranides4 年之前创建 · 2 条评论
ranides 评论于 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 评论于 3 年之前
所有者

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 关闭
ranides 在代码提交 3 年之前 中引用了该工单
ranides 评论于 3 年之前
所有者

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.
登录 并参与到对话中。
未选择里程碑
未指派成员
1 名参与者
正在加载...
取消
保存
这个人很懒,什么都没留下。