Steve Loughran created HADOOP-14766:

             Summary: add an object store high performance hdfs put command
                 Key: HADOOP-14766
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs, fs/s3
    Affects Versions: 2.8.1
            Reporter: Steve Loughran

{{hdfs put local s3a://path}} is suboptimal as it treewalks down down the 
source tree then, sequentially, copies up the file through copying the file 
(opened as a stream) contents to a buffer, writes that to the dest file, 

For S3A that hurts because
* it;s doing the upload inefficiently: the file can be uploaded just by 
handling the pathname to the AWS xter manager
* it is doing it sequentially, when some parallelised upload would work. 
* as the ordering of the files to upload is a recursive treewalk, it doesn't 
spread the upload across multiple shards. 


* build the list of files to upload
* upload in parallel, picking entries from the list at random and spreading 
across a pool of uploaders
* upload straight from local file (copyFromLocalFile()
* track IO load (files created/second) to estimate risk of throttling.

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