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https://issues.apache.org/jira/browse/SOLR-9867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15990278#comment-15990278
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Erick Erickson commented on SOLR-9867:
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Well, it was a nice idea but apparently this JIRA doesn't fix the recent
SolrCloudExampleTest failures. Pity.
> The Solr examples can not always be started after being stopped due to race
> with loading core.
> ----------------------------------------------------------------------------------------------
>
> Key: SOLR-9867
> URL: https://issues.apache.org/jira/browse/SOLR-9867
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mark Miller
> Priority: Critical
> Fix For: 6.6, master (7.0)
>
> Attachments: SDF init and doFilter in parallel.png, SOLR-9867.patch,
> SOLR-9867.patch, SOLR-9867.patch, SOLR-9867.patch, SOLR-9867-test.patch
>
>
> I'm having trouble when I start up the schemaless example after shutting down.
> I first tracked this down to the fact that the run example tool is getting an
> error when it tries to create the SolrCore (again, it already exists) and so
> it deletes the cores instance dir which leads to tlog and index lock errors
> in Solr.
> The reason it seems to be trying to create the core when it already exists is
> that the run example tool uses a core status call to check existence and
> because the core is loading, we don't consider it as existing. I added a
> check to look for core.properties.
> That seemed to let me start up, but my first requests failed because the core
> was still loading. It appears CoreContainer#getCore is supposed to be
> blocking so you don't have this problem, but there must be an issue, because
> it is not blocking.
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