Hello, We observed this problem too with older Solr versions. Whenever none of the shard's replica's would come up we would just shut them all down again and restart just one replica and wait. In some cases it won't come up (still true for Solr 7.4), but start a second shard a while later and wait again. Usually one would become leader and then all is fine, if not, shut all down and start another replica first and repeat.
Regards, Markus -----Original message----- > From:Dasarathi Minjur <zeplin1...@gmail.com> > Sent: Monday 15th October 2018 21:30 > To: solr-user@lucene.apache.org > Subject: Solr Shards down for unknown reason > > We have a Hadoop cluster with Solr 6.3 running as service. After an OS > security patching, when the cluster was restarted, Solr Cloud is up but the > shards are down all the time. No specific messages in Solr.log or console > logs. Tried restarting solr but that didn't help. Any pointers to get the > shards up will be helpful. Thanks for taking time to respond. >
