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https://issues.apache.org/jira/browse/SOLR-2694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13282248#comment-13282248
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Mikhail Khludnev commented on SOLR-2694:
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Ethan,
# that patch (dated 1/1/12) has absolutely no sense, I tell you as an author:
UpdateProcessors are thread unaware prototypes, not singletons;
# the later patch from SOLR-2804 make sense for DIH with "threads", which is
not supported further;
# your core problem is "The update chain we defined is enforced with
singleton", I suggest instantiate the necessary logic in UpdateProcessorFactory
and provide it for concurrent access from thread unaware UpdateProcessors.
> LogUpdateProcessor not thread safe
> ----------------------------------
>
> Key: SOLR-2694
> URL: https://issues.apache.org/jira/browse/SOLR-2694
> Project: Solr
> Issue Type: Bug
> Components: update
> Affects Versions: 1.4.1, 3.1, 3.2, 3.3, 4.0
> Reporter: Jan Høydahl
>
> Using the LogUpdateProcessor while feeding in multiple parallell threads does
> not work, as LogUpdateProcessor is not threadsafe.
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