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https://issues.apache.org/jira/browse/LUCENE-4796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587263#comment-13587263
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Commit Tag Bot commented on LUCENE-4796:
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[branch_4x commit] Uwe Schindler
http://svn.apache.org/viewvc?view=revision&revision=1450276
Merged revision(s) 1450275 from lucene/dev/trunk:
LUCENE-4796, SOLR-4373: Fix concurrency issue in NamedSPILoader and
AnalysisSPILoader when doing concurrent core loads in multicore Solr configs
> NamedSPILoader.reload needs to be synchronized
> ----------------------------------------------
>
> Key: LUCENE-4796
> URL: https://issues.apache.org/jira/browse/LUCENE-4796
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Hoss Man
> Assignee: Uwe Schindler
> Fix For: 4.2, 5.0
>
> Attachments: LUCENE-4796.patch, LUCENE-4796.patch
>
>
> Spun off of SOLR-4373: as discsused with uwe on IRC, NamedSPILoader.reload is
> not thread safe: it reads from this.services at the beginging of hte method,
> makes additions based on the method input, and then overwrites this.services
> at the end of the method. if the method is called by two threads
> concurrently, the entries added by threadB could be lost if threadA enters
> the method before threadB and exists the method after threadB
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