Steve Loughran created HADOOP-14766:
---------------------------------------

             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.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: common-issues-h...@hadoop.apache.org

Reply via email to