[jira] [Resolved] (SLING-10489) Ignore partially started, newly joining instances to avoid disturbing discovery (for a while)

["Stefan Egli (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SLING-10489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Egli resolved SLING-10489.
---------------------------------
    Resolution: Fixed

Marking as done, next step are releasing discovery.oak 1.2.36 (and finish up release of discovery.base 2.0.12 and discovery.commons 1.0.26) - but those are not exactly tied to this ticket

> 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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