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https://issues.apache.org/jira/browse/SOLR-1757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830395#action_12830395
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Michael Henson commented on SOLR-1757:
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The patch works to get it running. Now the issue is that the process doesn't
stop after an "abort" command is given.
> DIH multithreading sometimes throws NPE
> ---------------------------------------
>
> Key: SOLR-1757
> URL: https://issues.apache.org/jira/browse/SOLR-1757
> Project: Solr
> Issue Type: Bug
> Components: contrib - DataImportHandler
> Affects Versions: 1.4
> Environment: tomcat 6.0.x, jdk 1.6.x on windows xp 32bit
> Reporter: Michael Henson
> Assignee: Noble Paul
> Attachments: solr-1352-threads-bt.txt, SOLR-1757.patch
>
>
> When the "threads" attribute is set on a root entity in the DIH's
> data-config.xml, the multithreading code sometimes throws a
> NullPointerException after the full-index command is given.
> I haven't yet been able to figure out exactly which reference holds the null
> or why, but it does happen consistently with the same backtrace.
> My configuration is:
> 1. Multi-core Solr under tomcat
> 2. Using JdbcDataSource and the default SqlEntityProcessor
> To reproduce:
> 1. Add the attribute threads="2" to the root entity declaration in
> data-config.xml
> 2. Send the full-import command either directly to
> .../core/dataimport?command=full-import or through the /admin/dataimport.jsp
> control panel.
> 3. Wait for the NPE to show up in the logs/console
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