[jira] [Commented] (HADOOP-9639) truly shared cache for jars (jobjar/libjar)

["Chris Nauroth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-9639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13680627#comment-13680627 ] 

Chris Nauroth commented on HADOOP-9639:
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Hi, Sangjin.  Does YARN's concept of localized resources already address the use cases that you have in mind?

http://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/WritingYarnApplications.html#How_can_I_distribute_my_applications_jars_to_all_of_the_nodes_in_the_YARN_cluster_that_need_it

There is also the capability to control visibility, such that a localized resource cached on a node could be reused across all applications executed by the same user, or even public visibility for wide open sharing.

http://hadoop.apache.org/docs/current/api/org/apache/hadoop/yarn/api/records/LocalResourceVisibility.html

                
> truly shared cache for jars (jobjar/libjar)
> -------------------------------------------
>
>                 Key: HADOOP-9639
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9639
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: filecache
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sangjin Lee
>
> 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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