Not sure where we are going wrong in our implementation.
 
We have a Solr cloud environment (Solr 6.5), with 2 solr nodes and 3 Zookeeper 
servers. The environment was running without any issues, but lately noticed 
that one of the Solr node keeps shutting down frequently. We have replication 
in place where in we stated one per node.
This is what I see in the logs and it happens only on one particular Solr node, 
which keeps shutting down frequently.

2018-01-04 07:34:59.168 INFO  (qtp127618319-21) [c:S8IYAB s:shard1 r:core_node2 
x:S8IYAB_shard1_replica1] o.a.s.c.PluginBag Going to create a new 
requestHandler with {type = requestHandler,name = /update/extract,class = 
solr.extraction.ExtractingRequestHandler,attributes = {startup=lazy, 
name=/update/extract, class=solr.extraction.ExtractingRequestHandler},args = 
{defaults={uprefix=ignored_,captureAttr=true,df=_text_}}}
2018-01-04 07:35:00.490 ERROR 
(updateExecutor-2-thread-9-processing-http:////sr02:8983//solr//S8IYAB_shard1_replica2
 x:S8IYAB_shard1_replica1 r:core_node2 n:sr01:8983_solr s:shard1 c:S8IYAB) 
[c:S8IYAB s:shard1 r:core_node2 x:S8IYAB_shard1_replica1] 
o.a.s.u.StreamingSolrClients error
java.net.ConnectException: Connection refused
  

2018-01-04 07:35:00.493 ERROR (qtp127618319-21) [c:S8IYAB s:shard1 r:core_node2 
x:S8IYAB_shard1_replica1] o.a.s.u.SolrCmdDistributor forwarding update to 
http://sr02:8983/solr/S8IYAB_shard1_replica2/ failed - retrying ... retries: 1 
add{,id=0DODD:S8IYAB-13E07D32C2474770A4E6A88EFA0E84F6} 
params:update.distrib=TOLEADER&distrib.from=http://sr01:8983/solr/S8IYAB_shard1_replica1/
 rsp:-1:java.net.ConnectException: Connection refused

2018-01-04 07:35:00.995 ERROR 
(updateExecutor-2-thread-9-processing-http:////sr02:8983//solr//S8IYAB_shard1_replica2
 x:S8IYAB_shard1_replica1 r:core_node2 n:sr01:8983_solr s:shard1 c:S8IYAB) 
[c:S8IYAB s:shard1 r:core_node2 x:S8IYAB_shard1_replica1] 
o.a.s.u.StreamingSolrClients error
java.net.ConnectException: Connection refused

2018-01-04 07:35:00.996 ERROR (qtp127618319-21) [c:S8IYAB s:shard1 r:core_node2 
x:S8IYAB_shard1_replica1] o.a.s.u.SolrCmdDistributor forwarding update to 
http://sr02:8983/solr/S8IYAB_shard1_replica2/ failed - retrying ... retries: 2 
add{,id=0DODD:S8IYAB-13E07D32C2474770A4E6A88EFA0E84F6} 
params:update.distrib=TOLEADER&distrib.from=http://sr01:8983/solr/S8IYAB_shard1_replica1/
 rsp:-1:java.net.ConnectException: Connection refused

2018-01-04 07:35:01.497 ERROR 
(updateExecutor-2-thread-9-processing-http:////sr02:8983//solr//S8IYAB_shard1_replica2
 x:S8IYAB_shard1_replica1 r:core_node2 n:sr01:8983_solr s:shard1 c:S8IYAB) 
[c:S8IYAB s:shard1 r:core_node2 x:S8IYAB_shard1_replica1] 
o.a.s.u.StreamingSolrClients error
java.net.ConnectException: Connection refused
………


2018-01-04 07:35:12.544 ERROR (qtp127618319-21) [c:S8IYAB s:shard1 r:core_node2 
x:S8IYAB_shard1_replica1] o.a.s.u.SolrCmdDistributor forwarding update to 
http://sr02:8983/solr/S8IYAB_shard1_replica2/ failed - retrying ... retries: 25 
add{,id=0DODD:S8IYAB-13E07D32C2474770A4E6A88EFA0E84F6} 
params:update.distrib=TOLEADER&distrib.from=http://sr01:8983/solr/S8IYAB_shard1_replica1/
 rsp:-1:java.net.ConnectException: Connection refused
……..

2018-01-05 03:54:15.506 INFO  (ShutdownMonitor) [   ] o.a.s.c.Overseer Overseer 
(id=98943164658291709-sr01:8983_solr-n_0000000071) closing
2018-01-05 03:54:15.507 INFO  
(OverseerStateUpdate-98943164658291709-sr01:8983_solr-n_0000000071) [   ] 
o.a.s.c.Overseer Overseer Loop exiting : sr01:8983_solr
2018-01-05 03:54:17.013 WARN  
(zkCallback-4-thread-20-processing-n:sr01:8983_solr) [   ] 
o.a.s.c.c.ZkStateReader ZooKeeper watch triggered, but Solr cannot talk to ZK: 
[KeeperErrorCode = Session expired for /live_nodes]
2018-01-05 03:54:17.013 INFO  (ShutdownMonitor) [   ] o.a.s.m.SolrMetricManager 
Closing metric reporters for: solr.node


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