[
https://issues.apache.org/jira/browse/YARN-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955869#comment-15955869
]
Jonathan Hung commented on YARN-1492:
-------------------------------------
Hi [~ctrezzo], question - will this feature save jars from being relocalized
across different jobs on a node? My understanding is that this feature prevents
the same jar from being uploaded to HDFS, but once the jar is there, it will be
downloaded once per job per node due to the resource localization logic. Just
wanted to clarify my understanding of the scope of this feature.
> 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
> Attachments: 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,
> 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
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
---------------------------------------------------------------------
To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org
