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https://issues.apache.org/jira/browse/YARN-1492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Trezzo updated YARN-1492:
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Attachment: shared_cache_design_v5.pdf
Attached is a v5 of the design document. Some of the major changes are:
# Cache management logic moved from the client to a shared cache manager and
localization service. As a benefit, cached resources are now read-only and
managed solely by a trusted source (SCM and NodeManager) running as its own
user.
# Caching of a resource is now off the job submission path and happens
asynchronously. If submitting to the cache fails, it does not affect the job.
# Improved robustness when dealing with clients that don’t clean up after
themselves correctly.
Feedback is always appreciated. I will be starting implementation shortly.
> 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: Sangjin Lee
> 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
>
>
> 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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