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https://issues.apache.org/jira/browse/SOLR-2694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13078810#comment-13078810
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Jan Høydahl commented on SOLR-2694:
-----------------------------------
Haven't analyzed it deeply, but it is very easy to reproduce.
1. Setup an UpdateChain with the LogUpdateProcessor in it
2. Start feeding a bunch of docs in one shell window
3. Start feeding a bunch of docs in another shell window
4. Bang!
Cannot see from the code why this happens, but it seems to be related to usage
of the SimpleOrderedMap.
> 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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