Ramkumar Aiyengar created SOLR-6336:
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Summary: DistributedQueue (and it's use in OCP) leaks ZK Watches
Key: SOLR-6336
URL: https://issues.apache.org/jira/browse/SOLR-6336
Project: Solr
Issue Type: Bug
Components: SolrCloud
Reporter: Ramkumar Aiyengar
The current {{DistributedQueue}} implementation leaks ZK watches whenever it
finds children or times out on finding one. OCP uses this in its event loop and
can loop tight in some conditions (when exclusivity checks fail), leading to
lots of watches which get triggered together on the next event (could be a
while for some activities like shard splitting).
This gets exposed by SOLR-6261 which spawns a new thread for every parallel
watch event.
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