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https://issues.apache.org/jira/browse/HADOOP-14766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126332#comment-16126332
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Steve Loughran commented on HADOOP-14766:
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PoC w tests against local & s3a, built against branch-2.8
https://github.com/steveloughran/cloudup
> Add an object store high performance dfs 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
> Assignee: 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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