GH-3078: Use Hadoop FileSystem.openFile() to open files #3079
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* Open files with FileSystem.openFile(), passing in file status * And read policy of "parquet, vector, random, adaptive"
steveloughran
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@Fokko @gszadovszky Could you help review this? Thanks! |
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Rationale for this change
If parquet passes down the
FileStatusit previously collected, S3A and ABFS clients can skip their own HEAD probe. This saves time, money and IO capacity.When the read policy is passed in, the clients know immediately what kind of read pattern to expect, rather than infer it as reads take place or from the file suffix.
What changes are included in this PR?
Are these changes tested?
Through parquet-hadoop.
Are there any user-facing changes?
no.
Closes #3078