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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13600) S3a rename() to copy files in a directory in parallel
Date Sat, 09 Sep 2017 17:47:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16160028#comment-16160028
] 

ASF GitHub Bot commented on HADOOP-13600:
-----------------------------------------

Github user steveloughran commented on a diff in the pull request:

    https://github.com/apache/hadoop/pull/157#discussion_r137931515
  
    --- Diff: hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
---
    @@ -269,7 +273,8 @@ public StorageStatistics provide() {
           }
           useListV1 = (listVersion == 1);
     
    -      initTransferManager();
    +      this.uploads = createUploadTransferManager(conf);
    +      this.copies = createCopyTransferManager(conf);
    --- End diff --
    
    I'd actually like this to be on demand. That way, if not needed, no overhead of creating
it. init times of s3a are already high


> S3a rename() to copy files in a directory in parallel
> -----------------------------------------------------
>
>                 Key: HADOOP-13600
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13600
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.7.3
>            Reporter: Steve Loughran
>            Assignee: Sahil Takiar
>
> Currently a directory rename does a one-by-one copy, making the request O(files * data).
If the copy operations were launched in parallel, the duration of the copy may be reducable
to the duration of the longest copy. For a directory with many files, this will be significant



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