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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10987) Provide an iterator-based listing API for FileSystem
Date Tue, 04 Nov 2014 15:14:37 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14196199#comment-14196199
] 

Hudson commented on HADOOP-10987:
---------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1947 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1947/])
HADOOP-10987. Provide an iterator-based listing API for FileSystem. Contributed by Kihwal
Lee. (kihwal: rev 67f13b58e4d41879845aa118186d984de2e312ed)
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileStatus.java
* hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestHarFileSystem.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FilterFileSystem.java
* hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/FileSystemTestWrapper.java
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java
* hadoop-common-project/hadoop-common/CHANGES.txt


> Provide an iterator-based listing API for FileSystem
> ----------------------------------------------------
>
>                 Key: HADOOP-10987
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10987
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.7.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 2.7.0
>
>         Attachments: HADOOP-10987.patch, HADOOP-10987.v2.patch, HADOOP-10987.v3.patch,
HADOOP-10987.v4.branch-2.patch, HADOOP-10987.v4.patch, HADOOP-10987.v4_with_comment_fix.branch-2.patch,
HADOOP-10987.v4_with_comment_fix.patch
>
>
> Iterator based listing methods already exist in {{FileContext}} for both simple listing
and listing with locations. However, {{FileSystem}} lacks the former.  From what I understand,
it wasn't added to {{FileSystem}} because it was believed to be phased out soon. Since {{FileSystem}}
is very well alive today and new features are getting added frequently, I propose adding an
iterator based {{listStatus}} method. As for the name of the new method, we can use the same
name used in {{FileContext}} : {{listStatusIterator()}}.
> It will be particularly useful when listing giant directories. Without this, the client
has to build up a huge data structure and hold it in memory. We've seen client JVMs running
out of memory because of this.
> Once this change is made, we can modify FsShell, etc. in followup jiras.



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