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From "Jessica Cheng Mallet (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-9116) Race condition causing occasional SolrIndexSearcher leak when SolrCore is reloaded
Date Mon, 16 May 2016 16:55:12 GMT
Jessica Cheng Mallet created SOLR-9116:
------------------------------------------

             Summary: Race condition causing occasional SolrIndexSearcher leak when SolrCore
is reloaded
                 Key: SOLR-9116
                 URL: https://issues.apache.org/jira/browse/SOLR-9116
             Project: Solr
          Issue Type: Bug
            Reporter: Jessica Cheng Mallet


Fix a leak of SolrIndexSearcher when a SolrCore is reloaded. Added a test to expose this leak
when run in many iterations (pretty reliable failure with iters=1K), which passes with the
fix (ran iters=10K twice).

The fundamental issue is that when an invocation of SolrCore#openNewSearcher is racing with
SolrCore#close, if this synchronized block (https://github.com/apache/lucene-solr/blob/master/solr/
core/src/java/org/apache/solr/core/SolrCore.java#L1611) in openNewSearcher doesn't check for
whether or not the core is closed, it can possibly run after the core runs closeSearcher and
assign the newly constructed searcher to realtimeSearcher again, which will never be cleaned
up. The fix is to check if the SolrCore is closed inside the synchronized block, and if so,
clean up the newly constructed searcher and throw an Exception.



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