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From "Pushkar Raste (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-9524) SolrIndexSearcher.getIndexFingerprint uses dubious sunchronization
Date Fri, 16 Sep 2016 22:20:21 GMT

    [ https://issues.apache.org/jira/browse/SOLR-9524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15497566#comment-15497566
] 

Pushkar Raste commented on SOLR-9524:
-------------------------------------

Nice catch. 

May be we should right a test case, now that twice fingerprint caching got us in trouble.

> SolrIndexSearcher.getIndexFingerprint uses dubious sunchronization
> ------------------------------------------------------------------
>
>                 Key: SOLR-9524
>                 URL: https://issues.apache.org/jira/browse/SOLR-9524
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 6.3
>            Reporter: Mike Drob
>         Attachments: SOLR-9524.patch
>
>
> In SOLR-9310 we added more code that does some fingerprint caching in SolrIndexSearcher.
However, the synchronization looks like it could be made more efficient and may have issues
with correctness.
> https://github.com/apache/lucene-solr/blob/branch_6x/solr/core/src/java/org/apache/solr/search/SolrIndexSearcher.java#L2371-L2385
> Some of the issues:
> * Double checked locking needs use of volatile variables to ensure proper memory semantics.
> * sync on a ConcurrentHashMap is usually a code smell



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