The leader in the cluster is what is throwing the error. One of the stack traces: <http://lucene.472066.n3.nabble.com/file/n4201019/SolrError-Conflict.png>
However I didn't notice this one before which has a bit more info: org.apache.solr.common.SolrException: Conflict request: http://<ip>:8080/solr/classic_bt/update?update.chain=savolangid&update.distrib=TOLEADER&distrib.from=http%3A%2F%2F<ip>%3A8080%2Fsolr%2Fclassic_bt%2F&wt=javabin&version=2 at org.apache.solr.client.solrj.impl.ConcurrentUpdateSolrServer$Runner.run(ConcurrentUpdateSolrServer.java:241) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) We are using solr 4.10.2 and sadly our logging outside of the warn/error is a little lackluster (I'm working on fixing it but need to work through a change approval process). -- View this message in context: http://lucene.472066.n3.nabble.com/Has-anyone-seen-this-error-tp4200975p4201019.html Sent from the Solr - User mailing list archive at Nabble.com.