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https://issues.apache.org/jira/browse/SOLR-3011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222354#comment-13222354
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Wenca Petr commented on SOLR-3011:
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The problem was that the first thread that reached the end of data set the
iterator to null and when other thread called SqlEntityProcessor.nextRow() then
all the data to be indexed were loaded again and all the documents were
analysed again because SqlEntityProcessor.nextRow() tests the iterator to be
null (assuming that null means the beginning of the process). By the change a
made all the threads then receive null from the iterator, so they know that
there are no more data. Is this explanation ok?
> DIH MultiThreaded bug
> ---------------------
>
> Key: SOLR-3011
> URL: https://issues.apache.org/jira/browse/SOLR-3011
> Project: Solr
> Issue Type: Sub-task
> Components: contrib - DataImportHandler
> Affects Versions: 3.5, 4.0
> Reporter: Mikhail Khludnev
> Priority: Minor
> Fix For: 4.0
>
> Attachments: SOLR-3011.patch, SOLR-3011.patch,
> patch-3011-EntityProcessorBase-iterator.patch
>
>
> current DIH design is not thread safe. see last comments at SOLR-2382 and
> SOLR-2947. I'm going to provide the patch makes DIH core threadsafe. Mostly
> it's a SOLR-2947 patch from 28th Dec.
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