As has been pointed out already, platforms other than Linux provide similar functionality, yet this proposal does not provide any support for them. Even if such support isn't added initially, the APIs added for the Linux implementation should be generic enough that direct IO support could be added for other platforms in the future, and that Java code using direct IO on Linux would work on other direct IO enabled platforms as well. My concern is that the proposed APIs are too Linux-specific to make that possible.

I'm well aware of the issues in things like Hadoop and Apache Spark, their over-reliance on platform-specific functionality and native code has made it extremely difficult to get them to work well on platforms other than Linux/x86. We should not make the same mistake in Java itself.


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Alan Burlison
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