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https://issues.apache.org/jira/browse/SOLR-3011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13219940#comment-13219940
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Wenca Petr commented on SOLR-3011:
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Hi, I've just applied this patch and it solved my problem with multithreaded
indexing from sql using berkeley backed cache, which was opened x times (for
each thread) bud closed only by one thread, so it remained opened. After the
path, the cache is opened only once and properly closed but each thread seems
to index all documents. If I have 5000 documents and 4 threads then full import
say: "Added/Updated: 20000 documents".
> 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
>
>
> 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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