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https://issues.apache.org/jira/browse/SLIDER-226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065811#comment-14065811
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Ted Yu commented on SLIDER-226:
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Currently NodeEntry keeps count of live and releasing instances.
For rolling upgrade, we need more information - e.g. reference to image file
which backs a particular entry.
This would allow helper method in NodeMap to decide which instance to release.
> Provide mechanism for rolling upgrade
> -------------------------------------
>
> Key: SLIDER-226
> URL: https://issues.apache.org/jira/browse/SLIDER-226
> Project: Slider
> Issue Type: Improvement
> Reporter: Ted Yu
>
> update action paves the road for supporting rolling upgrade on Slider
> deployed cluster.
> User can specify a different image for a running cluster with N instances for
> role R.
> The rolling upgrade would restart each of the N instances while maintaining
> the invariant that there're at least N-1 active instances for role R.
> After restart, new image would be effective.
> This capability would, e.g., allow HBase to perform compatibility check
> across releases.
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