steveloughran opened a new pull request, #7846:
URL: https://github.com/apache/hadoop/pull/7846
Option "fs.file.checksum.verify" disables checksum verification in local FS,
so sliced subsets of larger buffers are never returned.
Stream capability "fs.capability.vectoredio.sliced" is true if a filesystem
knows that it is returning slices of a larger buffer. This is false if a
filesystem doesn't, or against the local FS in releases which lack this feature.
Contributed by Steve Loughran
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### Description of PR
this is #7732 as cherrypicked from branch-3.4 to trunk
### How was this patch tested?
run modified common and hadoop-aws tests; full aws test in progress
### For code changes:
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