[jira] [Commented] (SOLR-3197) Allow firstSearcher and newSearcher listeners to run in multiple threads

["Mark Miller (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-3197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221519#comment-13221519 ] 

Mark Miller commented on SOLR-3197:
-----------------------------------

Yeah, perhaps we can make it configurable, default to 1.
                
> Allow firstSearcher and newSearcher listeners to run in multiple threads
> ------------------------------------------------------------------------
>
>                 Key: SOLR-3197
>                 URL: https://issues.apache.org/jira/browse/SOLR-3197
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Lance Norskog
>
> SolrCore submits all listeners (firstSearcher and newSearcher) to a java ExecutorService, but uses a single-threaded one. 
> line 965 in the trunk: 
> {code}
> SolrCore.java around line 965: final ExecutorService searcherExecutor = Executors.newSingleThreadExecutor(); 
> line 1280 in the trunk: 
> SolrCore.java around line 1280 runs first the, and then the first and new searchers, all with the searcherExecutor object created at line 965. 
> Would it work if we changed this ExecutorService to a thread pool version? This seems like it should work:
> {code}
> java.util.concurrent.Executors.newFixedThreadPool(int nThreads, ThreadFactory threadFactory);
> {code}

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