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https://issues.apache.org/jira/browse/SOLR-10721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16018646#comment-16018646
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Erick Erickson commented on SOLR-10721:
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Thinking about this a little more, I can envision other kinds of states being
added in the future. Rather than calls for various possibilities, what about
starting out with just a long and some bit constants? That would give a more
nuanced view and wouldn't require that the users know about stuff like "loading
is finished, therefore core discovery is finished".
The fact that setting two bits, call them LOAD_COMPLETED and DISCOVERY_FINISHED
at the end of the load() method is an implementation detail.
> Provide a way to know when Core Discovery is finished and when all async
> cores are done loading
> -----------------------------------------------------------------------------------------------
>
> Key: SOLR-10721
> URL: https://issues.apache.org/jira/browse/SOLR-10721
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Priority: Minor
>
> Custom transient core implementations could benefit from knowing two things:
> 1> that core discovery is over
> 2> that all cores that are going to be loaded have been loaded, i.e. all
> loadOnStartup cores are done.
> It should be trivial to add a method to CoreContainer like "isLoaded" that
> would answer the first question since you can't get past the load() method
> without all the cores being discovered. I think this is a more generally
> useful bit of information than just core discovery is done.
> As for the second, that too seems trivial, just add a method to CoreContainer
> that returns the number of entries in SolrCores.currentlyLoadingCores.
> I'll add this in a few days unless there are objections.
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