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https://issues.apache.org/jira/browse/STORM-876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15038241#comment-15038241
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ASF GitHub Bot commented on STORM-876:
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Github user ptgoetz commented on the pull request:
https://github.com/apache/storm/pull/845#issuecomment-161736488
@redsanket First of all thank you for contributing this and making it
through the most epic code review we've had to date. :)
I'm +1 for merging this as is, but I'd like to see two follow up tasks (can
be handled as separate JIRAs):
1. Merge the contents of the DISTCACHE.md and design document attached to
the JIRA and add them to Storm's documentation.
2. Add an example topology to storm-starter (e.g. one with a bolt that uses
the blobstore to lookup values from a sample file, etc. that may change over
time).
We should probably address those 2 items before a 1.0 release.
This is a big addition. I'd encourage other committers to review this as
well, if for no other reason than to familiarize yourself with the
functionality that's being added.
> Dist Cache: Basic Functionality
> -------------------------------
>
> Key: STORM-876
> URL: https://issues.apache.org/jira/browse/STORM-876
> Project: Apache Storm
> Issue Type: Improvement
> Components: storm-core
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Attachments: DISTCACHE.md, DistributedCacheDesignDocument.pdf
>
>
> Basic functionality for the Dist Cache feature.
> As part of this a new API should be added to support uploading and
> downloading dist cache items. storm-core.ser, storm-conf.ser and storm.jar
> should be written into the blob store instead of residing locally. We need a
> default implementation of the blob store that does essentially what nimbus
> currently does and does not need anything extra. But having an HDFS backend
> too would be great for scalability and HA.
> The supervisor should provide a way to download and manage these blobs and
> provide a working directory for the worker process with symlinks to the
> blobs. It should also allow the blobs to be updated and switch the symlink
> atomically to point to the new blob once it is downloaded.
> All of this is already done by code internal to Yahoo! we are in the process
> of getting it ready to push back to open source shortly.
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