[jira] [Commented] (SOLR-1416) reduce contention in CoreContainer#getCore()

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-1416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13631334#comment-13631334 ] 

Shalin Shekhar Mangar commented on SOLR-1416:
---------------------------------------------

Noble and I worked on LotsOfCores for AOL which had more than 20K cores per Solr instance. The top three factors slowing down solr for such use-cases were:
# Opening IndexSearcher (our use-case had a 10:1 write/read ratio) - solved by opening searcher lazily
# Loading/parsing IndexSchema and SolrConfig objects - solved by caching these objects
# Contention in CoreContainer#getCore - solved by the attached patch

At this later date, I don't have the data to support this change but it is worth benchmarking if someone is up for 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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