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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13321) Deprecate FileSystem APIs that promote inefficient call patterns.
Date Wed, 22 Feb 2017 23:00:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15879420#comment-15879420
] 

Mingliang Liu commented on HADOOP-13321:
----------------------------------------

Thanks Steve!

I filed [HADOOP-14106] for tracking the effort of fixing the deprecated calls in UT.

> Deprecate FileSystem APIs that promote inefficient call patterns.
> -----------------------------------------------------------------
>
>                 Key: HADOOP-13321
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13321
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 3.0.0-alpha3
>            Reporter: Chris Nauroth
>            Assignee: Mingliang Liu
>         Attachments: HADOOP-13321.000.patch, HADOOP-13321.001.patch, HADOOP-13321.002.patch,
HADOOP-13321.003.patch, HADOOP-13321.004.patch
>
>
> {{FileSystem}} contains several methods that act as convenience wrappers over calling
{{getFileStatus}} and retrieving a single property of the returned {{FileStatus}}.  These
methods have a habit of fostering inefficient call patterns in applications, resulting in
multiple redundant {{getFileStatus}} calls.  For HDFS, this translates into wasteful NameNode
RPC traffic.  For file systems backed by cloud object stores, this translates into wasteful
HTTP traffic.  This issue proposes to deprecate these methods and instead encourage applications
to call {{getFileStatus}} and then reuse the same {{FileStatus}} instance as needed.



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