Deva created SOLR-16786:
---------------------------

             Summary: Zookeeper connection timeout even after Solr trying to 
connect. Connection establishes after restarting the Solr service
                 Key: SOLR-16786
                 URL: https://issues.apache.org/jira/browse/SOLR-16786
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
    Affects Versions: 8.6
            Reporter: Deva


Zookeeper connection timeout is experienced, with all 3 zookeeper. Apache Solr 
is removed from the live nodes once the connection timesout and connection 
re-establishes after restarting the Solr service. Same issue observed with 
different node where almost everyday a Solr node faces this connection timeout.

Solr version - 8.6.0

2023-05-03 09:28:19.743 WARN  
(zkConnectionManagerCallback-15-thread-1-SendThread(<IPaddress>:2181)) [   ] 
o.a.z.ClientCnxn Client session timed out, have not heard from server in 
20208ms for sessionid 0x10029c51d7d001d
2023-05-03 09:28:36.024 INFO  (qtp1164365897-2242) [   ] o.a.s.s.HttpSolrCall 
[admin] webapp=null path=/admin/cores 
params=\{action=STATUS&indexInfo=false&wt=json&version=2.2} status=0 QTime=0
2023-05-03 09:28:40.673 WARN  
(zkConnectionManagerCallback-15-thread-1-SendThread(<IPaddress>:2181)) [   ] 
o.a.z.ClientCnxn Client session timed out, have not heard from server in 
20830ms for sessionid 0x10029c51d7d001d
2023-05-03 09:29:02.355 WARN  
(zkConnectionManagerCallback-15-thread-1-SendThread(<IPaddress>:2181)) [   ] 
o.a.z.ClientCnxn Client session timed out, have not heard from server in 
21581ms for sessionid 0x10029c51d7d001d
2023-05-03 09:29:02.455 ERROR 
(OverseerCollectionConfigSetProcessor-72103520617955357-10.10.107.103:8983_solr-n_0000000525)
 [   ] o.a.s.c.OverseerTaskProcessor  => 
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for /overseer_elect/leader
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:102)
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for /overseer_elect/leader



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