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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 Tue, 15 Nov 2016 23:04:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15668668#comment-15668668
] 

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

As [HADOOP-13427] is committed, we have HADOOP, SPARK, HIVE, and PIG updated. I think we can
get this patch in? Deprecation in trunk may be encouraging for other ecosystem projects we're
not actively working on (say HBase, Tez etc).

Ping [~cnauroth] and [~stevel@apache.org]

> 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
>            Reporter: Chris Nauroth
>            Assignee: Mingliang Liu
>         Attachments: HADOOP-13321.000.patch, HADOOP-13321.001.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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