Hi, A few days ago I deployed a solr 4.9.0 cluster, which consists of 2 collections. Each collection has 1 shard with 3 replicates on 3 different machines.
On the first day I noticed this error appear on the leader. Full Log - http://pastebin.com/wcPMZb0s 4/23/2015, 2:34:37 PM SEVERE SolrCmdDistributor org.apache.solr.client.solrj.SolrServerException: IOException occured when talking to server at: http://production-solrcloud-004:8080/solr/bookings_shard1_replica2 4/23/2015, 2:34:37 PM WARNING DistributedUpdateProcessor Error sending update 4/23/2015, 2:34:37 PM WARNING ZkController Leader is publishing core=bookings_shard1_replica2 state=down on behalf of un-reachable replica http://production-solrcloud-004:8080/solr/bookings_shard1_replica2/; forcePublishState? false The other 2 replicas had 0 errors. I thought it may be a one off but the same error occured on day 2 which has got me slighlty concerned. During these periods I didn't notice any issues with the cluster and everything looks healthy in the cloud summary. All of the instances are hosted on AWS. Any idea what may be causing this issue and what I can do to mitigate? Thanks Amit