steveloughran commented on PR #5172:
URL: https://github.com/apache/hadoop/pull/5172#issuecomment-1335114105

   > I'd like to make oss also implement openFile() in this pr as s3a does 
which could also meet our needs.
   
   This is exactly what the API was designed for -to let people provide extra 
hints/options. to the object stores.
   
   Do read the filesystem.md and related docs on the topic, and look at the 
abfs implementation as well as the s3a one.
   
   If your implementation takes a FileStatus or length option, it can then skip 
the HEAD request on opening and save time and money. All the hadoop internal 
uses of openFile() do this. My own copies of the parquet and avro readers also 
do it for better cloud reading performance


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