Alexey Serba created SOLR-6678:
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Summary: Collection/core reload is causing a memory leak
Key: SOLR-6678
URL: https://issues.apache.org/jira/browse/SOLR-6678
Project: Solr
Issue Type: Bug
Affects Versions: 4.10
Reporter: Alexey Serba
I have a use case where I need to periodically
[reload|https://cwiki.apache.org/confluence/display/solr/Collections+API#CollectionsAPI-api2]
a SolrCloud collection. Recently I did ~1k reload operations and noticed that
the cluster was running slower and slower, so I connected to it with jconsole
and noticed that heap was growing with every reload operation, forcing GC
wasn't helping.
So I took a heap dump and noticed that I have too many SolrCore-s hanging
around.
It's hard for me to grok the root cause of this, but maybe someone more
knowledgable in Solr internals can figure it out by looking into this GC root
path (see attached image)? If I interpret this correctly, it looks like one
SolrCore is referencing another SolrCore through SolrSuggester. Maybe close
hook for SolrSuggester component doesn't release everything that it should be
releasing (like SolrSuggester.dictionary)?
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