[jira] [Created] (HADOOP-14766) add an object store high performance hdfs put command

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created HADOOP-14766:
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             Summary: add an object store high performance hdfs put command
                 Key: HADOOP-14766
                 URL: https://issues.apache.org/jira/browse/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, repeats.

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. 


Better:

* 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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