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https://issues.apache.org/jira/browse/SLIDER-773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14496361#comment-14496361
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Gour Saha commented on SLIDER-773:
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My bad on point 12 above. Seems like I missed the point that the if block
should not be executed if pkg is empty string. I changed the code slightly to
use {{StringUtils.isNotEmpty(pkg)}}. [~thomas_liu] is pkg validated such that
{{pkgStatuses.get(pkg)}} will never return a null? I mean, if pkg is not empty,
will it be always true that {{pkgStatuses}} will contain an entry for pkg? If
not, then we will run into NPE.
> Add co-processor support for app packages
> -----------------------------------------
>
> Key: SLIDER-773
> URL: https://issues.apache.org/jira/browse/SLIDER-773
> Project: Slider
> Issue Type: Bug
> Components: app-package, client
> Affects Versions: Slider 0.60
> Reporter: Sumit Mohanty
> Assignee: thomas liu
> Priority: Critical
> Fix For: Slider 0.80
>
> Attachments: 773-suggest.txt, Co-processorSupport.pdf,
> SLIDER-773_review_comments.patch, coprocessor-after.patch,
> coprocessor-apri-4th.patch, coprocessor.patch, coprocessor.patch
>
>
> It is typical for applications to allow plugins/co-processors that are
> essentially a set of additional jar files in the classpath and optionally a
> set of config files or config changes.
> Current, slider app packages can handle additional config changes/entries
> very well. Additional configs files can be added as well but it is not easy
> if the config files include parameters that need to be resolved by the agent.
> This requires app package changes. Dropping additional jar files into the
> class path is not easy and requires app package changes.
> It is not efficient to modify the app package to support such plugins. App
> packaging and create command should be modified such that the user can
> dynamically specify additional jars, config files, configs etc.
> Specific scenarios are modifying HBase to add support for Phoenix or Ranger.
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