zhijiangW commented on issue #8880: [FLINK-12986] [network] Fix instability of BoundedBlockingSubpartition under memory pressure. URL: https://github.com/apache/flink/pull/8880#issuecomment-506384076 Thanks for the explanations @StephanEwen ! As for how many people use 32bit JVM, I have not surveyed on it to give a ratio. I think the 64bit should be the mainstream in common sense. But we also do not want to bring a potential bad experience for 32bit users. As for the downsides in eager mapping, I think it might be based on the assumption that cached data is hot to be read soon, so it seems reasonable to do so. But if this assumption is not true, then the priority for caching these data in OS level might be misleading. I am not very sure whether it would bring downsides here, just point out a reminder here. And I agree that the current eager way would simplify the implementation much.
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