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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 Sat, 25 Jun 2016 01:08:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348976#comment-15348976
] 

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

+1 (non-binding) for the proposal, and the set of the wrapper methods. After watching https://www.youtube.com/watch?v=R-BjP1iQ5lU
I believe this is a necessary long term fix.

> 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
>
> {{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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