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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