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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13208) S3A listFiles(recursive=true) to do a bulk listObjects instead of walking the pseudo-tree of directories
Date Wed, 29 Jun 2016 19:13:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355681#comment-15355681
] 

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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