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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-9867) The Solr examples can not always be started after being stopped due to race with loading core.
Date Thu, 04 May 2017 13:24:04 GMT

    [ https://issues.apache.org/jira/browse/SOLR-9867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996716#comment-15996716
] 

Mikhail Khludnev commented on SOLR-9867:
----------------------------------------

rolled back {{SDF.createCoreContainer()}}, disabled {{testTechproductsExample}}
Since it seems like it breaks {{JvmMetricsTest.testSetupJvmMetrics}} at least. 

> 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
>            Assignee: Mikhail Khludnev
>            Priority: Critical
>             Fix For: 6.6, master (7.0)
>
>         Attachments: Lucene-Solr-master-MacOSX #3986 Console [Jenkins].htm, SDF init
and doFilter in parallel.png, SOLR-9867-createCoreContainer-fix.patch, SOLR-9867-ignore-whitespace.patch,
SOLR-9867.patch, SOLR-9867.patch, SOLR-9867.patch, SOLR-9867.patch, SOLR-9867.patch, SOLR-9867-test.patch,
stdout_90
>
>
> 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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