Hi, On 7.2 is regularly see this popping up:
2018-01-23 16:16:37.056 ERROR (qtp329611835-117592) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.s.s.HttpSolrCall null:java.io.IOException: java.util.concurrent.TimeoutException: Idle timeout expired: 120000/120000 ms at org.eclipse.jetty.util.SharedBlockingCallback$Blocker.block(SharedBlockingCallback.java:219) at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:220) at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:583) at org.apache.commons.io.output.ProxyOutputStream.write(ProxyOutputStream.java:55) at org.apache.solr.response.QueryResponseWriterUtil$1.write(QueryResponseWriterUtil.java:54) at java.io.OutputStream.write(OutputStream.java:116) at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221) at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:282) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:125) at java.io.OutputStreamWriter.write(OutputStreamWriter.java:207) at org.apache.solr.util.FastWriter.flush(FastWriter.java:140) at org.apache.solr.util.FastWriter.write(FastWriter.java:94) at org.apache.solr.response.TextResponseWriter.indent(TextResponseWriter.java:108) at org.apache.solr.response.TextResponseWriter.indent(TextResponseWriter.java:104) at org.apache.solr.response.JSONWriter.writeSolrDocument(JSONResponseWriter.java:364) at org.apache.solr.response.TextResponseWriter.writeSolrDocumentList(TextResponseWriter.java:261) at org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:172) at org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(JSONResponseWriter.java:209) at org.apache.solr.response.JSONWriter.writeNamedList(JSONResponseWriter.java:325) at org.apache.solr.response.JSONWriter.writeResponse(JSONResponseWriter.java:120) at org.apache.solr.response.JSONResponseWriter.write(JSONResponseWriter.java:71) at org.apache.solr.response.QueryResponseWriterUtil.writeQueryResponse(QueryResponseWriterUtil.java:65) at org.apache.solr.servlet.HttpSolrCall.writeResponse(HttpSolrCall.java:788) at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:525) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:382) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:326) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1751) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.server.Server.handle(Server.java:534) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:108) at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589) at java.lang.Thread.run(Thread.java:748) Caused by: java.util.concurrent.TimeoutException: Idle timeout expired: 120000/120000 ms at org.eclipse.jetty.io.IdleTimeout.checkIdleTimeout(IdleTimeout.java:166) at org.eclipse.jetty.io.IdleTimeout$1.run(IdleTimeout.java:50) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ... 1 more Just before that a while bunch of these pop up: 2018-01-23 16:11:19.851 WARN (zkConnectionManagerCallback-72-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-SendThread(89.188.14.10:2181)) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.z.ClientCnxn Client session timed out, have not heard from server in 6851ms for sessionid 0x60f9e7234def33 2018-01-23 16:11:19.851 WARN (zkConnectionManagerCallback-137-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-SendThread(89.188.14.10:2181)) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.z.ClientCnxn Client session timed out, have not heard from server in 6851ms for sessionid 0x60f9e7234def34 2018-01-23 16:11:19.851 WARN (zkConnectionManagerCallback-118-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-SendThread(89.188.14.10:2181)) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.z.ClientCnxn Client session timed out, have not heard from server in 6851ms for sessionid 0x60f9e7234def32 2018-01-23 16:11:19.851 WARN (zkConnectionManagerCallback-85-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-SendThread(89.188.14.12:2181)) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.z.ClientCnxn Client session timed out, have not heard from server in 6851ms for sessionid 0x260f9eafdf5f04d 2018-01-23 16:11:19.851 WARN (zkConnectionManagerCallback-93-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-SendThread(89.188.14.11:2181)) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.z.ClientCnxn Client session timed out, have not heard from server in 6851ms for sessionid 0x160f9e723bfefe1 2018-01-23 16:11:19.948 WARN (zkConnectionManagerCallback-123-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-EventThread) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.s.c.c.ConnectionManager Watcher org.apache.solr.common.cloud.ConnectionManager@1679200c name: ZooKeeperConnection Watcher:89.188.14.10:2181,89.188.14.11:2181,89.188.14.12:2181/solr_sitesearch_suggest got event WatchedEvent state:Disconnected type:None path:null path: null type: None 2018-01-23 16:11:19.948 WARN (zkConnectionManagerCallback-123-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-EventThread) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.s.c.c.ConnectionManager zkClient has disconnected 2018-01-23 16:11:19.948 WARN (zkConnectionManagerCallback-81-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-EventThread) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.s.c.c.ConnectionManager Watcher org.apache.solr.common.cloud.ConnectionManager@7d950a72 name: ZooKeeperConnection Watcher:89.188.14.10:2181,89.188.14.11:2181,89.188.14.12:2181/solr_sitesearch_search got event WatchedEvent state:Disconnected type:None path:null path: null type: None 2018-01-23 16:11:19.948 WARN (zkConnectionManagerCallback-81-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-EventThread) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.s.c.c.ConnectionManager zkClient has disconnected 2018-01-23 16:11:19.948 WARN (zkConnectionManagerCallback-89-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-EventThread) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.s.c.c.ConnectionManager Watcher org.apache.solr.common.cloud.ConnectionManager@7b29a94a name: ZooKeeperConnection Watcher:89.188.14.10:2181,89.188.14.11:2181,89.188.14.12:2181/solr_sitesearch_search got event WatchedEvent state:Disconnected type:None path:null path: null type: None 2018-01-23 16:11:19.948 WARN (zkConnectionManagerCallback-89-thread-1-processing-n:logs1.gr.nl.openindex.io:8983_solr x:logs_shard1_replica1 s:shard1 c:logs r:core_node1-EventThread) [c:logs s:shard1 r:core_node1 x:logs_shard1_replica1] o.a.s.c.c.ConnectionManager zkClient has disconnected Are these known error? Thanks, Markus