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https://issues.apache.org/jira/browse/SOLR-1416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12997644#comment-12997644
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David Smiley commented on SOLR-1416:
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I don't think ReadWriterLock makes sense when the operation that you're doing
is cheap (e.g. simple hashtable lookups). I argue you've actually slowed things
down! I think ConcurrentHashMap makes the most sense.
Just curious, did you have trepidation about this making you stop short of
committing it? You were a committer when you posted it.
> reduce contention in CoreContainer#getCore()
> --------------------------------------------
>
> Key: SOLR-1416
> URL: https://issues.apache.org/jira/browse/SOLR-1416
> Project: Solr
> Issue Type: Improvement
> Components: multicore
> Reporter: Noble Paul
> Priority: Minor
> Attachments: SOLR-1416.patch
>
>
> every call to CoreContainer#getCore() is synchronized . We should reduce the
> contention . The writes are very infrequent and reads are frequent . How
> about using a ReadWriterLock?
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