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https://issues.apache.org/jira/browse/HADOOP-13208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355681#comment-15355681
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Aaron Fabbri commented on HADOOP-13208:
---------------------------------------
Looks like there is a merge conflict in S3AFileSystem.java:
{code}
+<<<<<<< 3907f2a30d773828e85cb3c7ea367be749b65920
* Check that a Path belongs to this FileSystem.
* Unlike the superclass, this version does not look at authority,
* only hostnames.
* @param path to check
* @throws IllegalArgumentException if there is an FS mismatch
+=======
+ * Convert a key to a fully qualified path.
+ * @param key input key
+ * @return the fully qualified path including URI schema and bucket name.
+ */
+ private Path keyToQualifiedPath(String key) {
+ return keyToPath(key).makeQualified(uri, workingDir);
+ }
+
+ /**
+ * Opens an FSDataInputStream at the indicated Path.
+ * @param f the file name to open
+ * @param bufferSize the size of the buffer to be used.
+>>>>>>> HADOOP-13208: build remote iterator direct from object listings; use
in the nonrecursive listLocatedStatus call
{code}
> S3A listFiles(recursive=true) to do a bulk listObjects instead of walking the
> pseudo-tree of directories
> --------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-13208
> URL: https://issues.apache.org/jira/browse/HADOOP-13208
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Attachments: HADOOP-13208-branch-2-001.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> A major cost in split calculation against object stores turns out be listing
> the directory tree itself. That's because against S3, it takes S3A two HEADs
> and two lists to list the content of any directory path (2 HEADs + 1 list for
> getFileStatus(); the next list to query the contents).
> Listing a directory could be improved slightly by combining the final two
> listings. However, a listing of a directory tree will still be
> O(directories). In contrast, a recursive {{listFiles()}} operation should be
> implementable by a bulk listing of all descendant paths; one List operation
> per thousand descendants.
> As the result of this call is an iterator, the ongoing listing can be
> implemented within the iterator itself
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