alluxio
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Implement unbuffer interface for HdfsFileInputStream
What changes are proposed in this pull request?
Implement unbuffer interface for HdfsFileInputStream. Fix #16016.
Why are the changes needed?
If the unbuffer method is not implemented, then impala will not be able to use the file handle cache.
Does this PR introduce any user facing changes?
Implement CanUnbuffer and StreamCapabilities for HdfsFileInputStream.