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https://issues.apache.org/jira/browse/SOLR-7035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16142048#comment-16142048
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Shawn Heisey commented on SOLR-7035:
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Just came across this issue while researching something. The issue is older
than I expected.
Could this problem cause something I noticed on Solr 6.6.0, documented in the
following solr-user thread?
http://lucene.472066.n3.nabble.com/Solr-6-6-is-trying-to-loading-some-not-all-cores-more-than-once-td4346085.html
> Core reload calls firstSearcher listeners twice in some situations
> ------------------------------------------------------------------
>
> Key: SOLR-7035
> URL: https://issues.apache.org/jira/browse/SOLR-7035
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.0, 6.0
> Reporter: Tomás Fernández Löbbe
> Attachments: SOLR-7035-fail.patch
>
>
> {{core.reload()}} creates two searchers, one when creating the new core and
> one after creating the new IW. For each of those searchers it calls the
> registered listeners, however, depending on how long the first searcher takes
> to warm it may call the “firstSearcher” events twice.
> Probably the best solution would be to not even create the first of the
> searchers.
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