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https://issues.apache.org/jira/browse/SOLR-2006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968866#action_12968866
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Fuad Efendi commented on SOLR-2006:
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I believe it is resolved in SOLR-2233
> DataImportHandler creates multiple DB connections during a delta update
> -----------------------------------------------------------------------
>
> Key: SOLR-2006
> URL: https://issues.apache.org/jira/browse/SOLR-2006
> Project: Solr
> Issue Type: Improvement
> Components: contrib - DataImportHandler
> Affects Versions: 1.4, 1.4.1, 3.1, 4.0
> Reporter: Lance Norskog
>
> The DataImportHandler code for delta updates creates a separate copy of each
> datasource for each entity in the document. This creates a separate JDBC
> connection for each entity. In some relational databases, connections are a
> heavyweight resource and their use should be limited.
> A JDBC pool would help avoid this problem, and also assist in doing
> multi-threaded DIH indexing jobs.
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