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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13335) Add an option to suppress the 'use yarn jar' warning or remove it
Date Thu, 07 Jul 2016 00:52:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15365418#comment-15365418

Allen Wittenauer commented on HADOOP-13335:

bq. It is going to be hard to remove either of these. I don't know when something that has
been deprecated in a previous release has actually been removed.

There have been a ton of removals all over the place in trunk already.  S3, hftp, ... lots
and lots of places.  Bear in mind that the last opportunity Hadoop had to remove content was
over five years ago.

bq. If hadoop jar and yarn jar should behave the same

Once again: they do not.  I'm not sure how many more and different ways I can state this point.
 The rest of that discussion is pretty much moot since the first opportunity to make them
function the same will be 4.x, easily years off.

bq. This is arguable - but printing a new warning in the 2.7.0 release can be considered to
be an incompatible change.

Deprecation warnings have always been added to the output throughout the history of Hadoop.
 Expect a lot more to show up in trunk.

> Add an option to suppress the 'use yarn jar' warning or remove it
> -----------------------------------------------------------------
>                 Key: HADOOP-13335
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13335
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.7.0
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>         Attachments: HADOOP-13335.01.patch, HADOOP-13335.02.patch, HADOOP-13335.02_branch-2.patch,
HADOOP-13335.03.patch, HADOOP-13335.03_branch-2.patch, HADOOP-13335.04.patch
> https://issues.apache.org/jira/browse/HADOOP-11257 added a 'deprecation' warning for
'hadoop jar'.
> hadoop jar is used for a lot more that starting jobs. As an example - hive uses it to
start all it's services (HiveServer2, the hive client, beeline etc).
> Using 'yarn jar' for to start these services / tools doesn't make a lot of sense - there's
no relation to yarn other than requiring the classpath to include yarn libraries.
> I'd propose reverting the changes where this message is printed if YARN variables are
set (leave it in the help message), or adding a mechanism which would allow users to suppress

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