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https://issues.apache.org/jira/browse/HADOOP-10560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13991318#comment-13991318
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Andrei Savu commented on HADOOP-10560:
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... and also when fs.s3n.copyThreads = 1 we can use
MoreExecutors.sameThreadExecutor() if Guava is available as a library.
> Update NativeS3FileSystem to issue copy commands for files with in a
> directory with a configurable number of threads
> --------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-10560
> URL: https://issues.apache.org/jira/browse/HADOOP-10560
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/s3
> Reporter: Ted Malaska
> Assignee: Ted Malaska
> Priority: Minor
> Labels: performance
> Attachments: HADOOP-10560-1.patch, HADOOP-10560.patch
>
>
> In NativeS3FileSystem if you do a copy of a directory it will copy all the
> files to the new location, but it will do this with one thread. Code is
> below. This jira will allow a configurable number of threads to be used to
> issue the copy commands to S3.
> do {
> PartialListing listing = store.list(srcKey, S3_MAX_LISTING_LENGTH,
> priorLastKey, true);
> for (FileMetadata file : listing.getFiles())
> { keysToDelete.add(file.getKey()); store.copy(file.getKey(), dstKey +
> file.getKey().substring(srcKey.length())); }
> priorLastKey = listing.getPriorLastKey();
> } while (priorLastKey != null);
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