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Date: Mon, 8 Dec 2014 12:41:18 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
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Subject: [jira] [Commented] (YARN-1492) truly shared cache for jars
 (jobjar/libjar)
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    [ https://issues.apache.org/jira/browse/YARN-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14237829#comment-14237829 ] 

Hudson commented on YARN-1492:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #1964 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1964/])
YARN-2927. [YARN-1492] InMemorySCMStore properties are inconsistent. (Ray Chiang via kasha) (kasha: rev 120e1decd7f6861e753269690d454cb14c240857)
* hadoop-yarn-project/CHANGES.txt
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java


> truly shared cache for jars (jobjar/libjar)
> -------------------------------------------
>
>                 Key: YARN-1492
>                 URL: https://issues.apache.org/jira/browse/YARN-1492
>             Project: Hadoop YARN
>          Issue Type: New Feature
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sangjin Lee
>            Assignee: Chris Trezzo
>            Priority: Critical
>         Attachments: YARN-1492-all-trunk-v1.patch, YARN-1492-all-trunk-v2.patch, YARN-1492-all-trunk-v3.patch, YARN-1492-all-trunk-v4.patch, YARN-1492-all-trunk-v5.patch, shared_cache_design.pdf, shared_cache_design_v2.pdf, shared_cache_design_v3.pdf, shared_cache_design_v4.pdf, shared_cache_design_v5.pdf, shared_cache_design_v6.pdf
>
>
> Currently there is the distributed cache that enables you to cache jars and files so that attempts from the same job can reuse them. However, sharing is limited with the distributed cache because it is normally on a per-job basis. On a large cluster, sometimes copying of jobjars and libjars becomes so prevalent that it consumes a large portion of the network bandwidth, not to speak of defeating the purpose of "bringing compute to where data is". This is wasteful because in most cases code doesn't change much across many jobs.
> I'd like to propose and discuss feasibility of introducing a truly shared cache so that multiple jobs from multiple users can share and cache jars. This JIRA is to open the discussion.


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