Markus Jelsma created SOLR-10420:
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Summary: Solr 6.x leaking one SolrZkClient instance per second
Key: SOLR-10420
URL: https://issues.apache.org/jira/browse/SOLR-10420
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 6.4.2, 6.5
Reporter: Markus Jelsma
Fix For: master (7.0), branch_6x
One of our nodes became berzerk after a restart, Solr went completely nuts! So
i opened VisualVM to keep an eye on it and spotted a different problem that
occurs in all our Solr 6.4.2 and 6.5.0 nodes.
It appears Solr is leaking one SolrZkClient instance per second via
DistributedQueue$ChildWatcher. That one per second is quite accurate for all
nodes, there are about the same amount of instances as there are seconds since
Solr started. I know VisualVM's instance count includes
objects-to-be-collected, the instance count does not drop after a forced garbed
collection round.
It doesn't matter how many cores or collections the nodes carry or how heavy
traffic is.
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