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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 17:54:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16160038#comment-16160038
] 

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_r137931682
  
    --- Diff: hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
---
    @@ -2167,7 +2280,34 @@ public String getCanonicalServiceName() {
        * @throws IOException Other IO problems
        */
       private void copyFile(String srcKey, String dstKey, long size)
    -      throws IOException, InterruptedIOException, AmazonClientException {
    +      throws IOException, AmazonClientException {
    --- End diff --
    
    leave as before so as to make clear it may be interrupted, unless its mentioned in the
javadocs


> 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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