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https://issues.apache.org/jira/browse/SOLR-13350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17735929#comment-17735929
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Mark Robert Miller commented on SOLR-13350:
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I don't recall this code, but if the bitset was like an array, you wouldn't 
need a memory barrier for threads to be able to work on disjoint sections of 
the array. But you would need a memory barrier or something like an effectively 
final array variable for the threads to access the array reference, and you'd 
need a memory barrier on the values of the array for another thread to see them 
correctly. 

> Explore collector managers for multi-threaded search
> ----------------------------------------------------
>
>                 Key: SOLR-13350
>                 URL: https://issues.apache.org/jira/browse/SOLR-13350
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Ishan Chattopadhyaya
>            Assignee: Ishan Chattopadhyaya
>            Priority: Major
>         Attachments: SOLR-13350.patch, SOLR-13350.patch, SOLR-13350.patch
>
>          Time Spent: 3h
>  Remaining Estimate: 0h
>
> AFAICT, SolrIndexSearcher can be used only to search all the segments of an 
> index in series. However, using CollectorManagers, segments can be searched 
> concurrently and result in reduced latency. Opening this issue to explore the 
> effectiveness of using CollectorManagers in SolrIndexSearcher from latency 
> and throughput perspective.



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