[GitHub] [hadoop] steveloughran commented on pull request #2584: HADOOP-16202. Enhance openFile()

[GitBox <gi...@apache.org>]

steveloughran commented on pull request #2584:
URL: https://github.com/apache/hadoop/pull/2584#issuecomment-771070179


   rebased to fix compile problems; the final patch is the one with changes since Thomas's last review
   
   * move all the text on options into the fsdatainputstreambuilder.md file
   * try to define the validation of must/opt in pseudo-python
   * make sure the doc is consistent in saying FNFE and permission issues MUST be delayed until future.get() and MAY be delayed until the first actual read.  This is to give object stores the maximum time for async probes. Example: you could initiate a HEAD request in  build() but not block for its completion until read()
   
   S3A added some extra tuning of the input stream/openFile logic, so the stream no longer gets access to the S3 client, simply callbacks
   
   Testing: in progress


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