Hi, I seem to experience a memory leak on my Solr Cloud cluster with 3 TLOG machines. Followers in this configuration get ReplicationHandlers reloaded - old ReplicationHandler would be shut down and new one created and registered. As part of registration ReplicationHandler is added to SolrCore closeHooks. Old ReplicationHandler gets shut down BUT it is not removed from SolrCore closeHooks. Overtime with core reloads happening we collect a lot of ReplicationHandlers (~100) in SolrCore.closeHooks.
Some code references Core Reloaded: https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/core/CoreContainer.java#L1661-L1670 StartReplication: https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/cloud/ReplicateFromLeader.java#L91-L109 This code above calls ReplicationHandler.inform https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/handler/ReplicationHandler.java#L1235 which registers handler in closeHooks of SolrCore While StopReplication: https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/cloud/ReplicateFromLeader.java#L134-L139 does not remove ReplicationHandler from closeHooks Thank you. PS: Instructions to create an issue in Apache JIRA suggest I should check the distribution list first for validation :)
