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https://issues.apache.org/jira/browse/SLING-10489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Egli closed SLING-10489.
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> Ignore partially started, newly joining instances to avoid disturbing
> discovery (for a while)
> ---------------------------------------------------------------------------------------------
>
> Key: SLING-10489
> URL: https://issues.apache.org/jira/browse/SLING-10489
> Project: Sling
> Issue Type: Improvement
> Components: Discovery
> Affects Versions: Discovery Commons 1.0.24, Discovery Base 2.0.10,
> Discovery Oak 1.2.34
> Reporter: Stefan Egli
> Assignee: Stefan Egli
> Priority: Major
> Fix For: Discovery Base 2.0.12, Discovery Commons 1.0.26,
> Discovery Oak 1.2.36
>
> Time Spent: 8h 10m
> Remaining Estimate: 0h
>
> Discovery.oak requires that both Oak and Sling are operating normally in
> order to declare victory and announce a new topology.
> The startup phase is especially tricky in this regard, since there are
> multiple elements that need to get updated (some are in the Oak layer, some
> in Sling) :
> * lease & clusterNodeId : this is maintained by Oak
> * idMap : this is maintained by IdMapService (Sling)
> * leaderElectionId : this is maintained by OakViewChecker (Sling)
> * syncToken : this is maintained by SyncTokenService (Sling)
> Situations have been seen where Oak starts up fine, but higher level (eg
> Sling) bundles were not activated within a reasonable amount of time. This
> lead to discovery staying in TOPOLOGY_CHANGING state for longer than expected.
> There should be a mechanism that ignores (suppresses) newly joining instances
> if they start up only partially. However, after a certain timeout this
> mechanism should give up.
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