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https://issues.apache.org/jira/browse/SOLR-138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12579094#action_12579094
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Lance Norskog commented on SOLR-138:
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Our use case is the classic battle between interactive use and running reports:
reports use long queries that shut out interactive use.
One option is to have two search servlets instead of one, where each can have a
separate queueing depth. One servlet is reserved for long queries and may only
have one or two queries active at one time, while the other servlet is for
smaller interactive queries and might allow 5 concurrent queries.
> queries can stack up
> --------------------
>
> Key: SOLR-138
> URL: https://issues.apache.org/jira/browse/SOLR-138
> Project: Solr
> Issue Type: Bug
> Reporter: Yonik Seeley
>
> A burst of "expensive" queries can cause contention within lucene, greatly
> reducing effective throughput and causing more and more queries to stack up.
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