Hi, Let's move the discussion to the Java driver mailing list: https://groups.google.com/a/lists.datastax.com/forum/#!forum/java-driver-user
I'm posting a reply to this message there. -- Olivier Michallat Driver & tools engineer, DataStax On Tue, Nov 4, 2014 at 12:45 PM, Ola Nowak <ola.nowa...@gmail.com> wrote: > Hi All :) > I have an application which use DataStax Java driver v2.0.2 to connect > to Cassandra Cluster (6 nodes, v 2.0.11). > Application is deployed in three copies on 3 different servers. From > time to time on random application server I get this exception: > > 2014-11-04 10:37:15,301 - ERROR: Servlet.service() for servlet [Unique > Identifier Service] in context with path [/uis] threw exception > [com.datastax.driver.core.exceptions.NoHostAvailableException: All > host(s) tried for query failed (tried: [cassandra-11/10.0.0.11:9042, > /10.0.0.10:9042, /10.0.0.12:9042, /10.0.0.7:9042, /10.0.0.9:9042, > /10.0.0.8:9042] - use getErrors() for details)] with root cause > com.datastax.driver.core.exceptions.NoHostAvailableException: All > host(s) tried for query failed (tried: [cassandra-11/10.0.0.11:9042, > /10.0.0.10:9042, /10.0.0.12:9042, /10.0.0.7:9042, /10.0.0.9:9042, > /10.0.0.8:9042] - use getErrors() for details) > at > com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:103) > at > com.datastax.driver.core.SessionManager.execute(SessionManager.java:418) > at > com.datastax.driver.core.SessionManager.executeQuery(SessionManager.java:454) > at > com.datastax.driver.core.SessionManager.executeAsync(SessionManager.java:104) > at > com.datastax.driver.core.SessionManager.execute(SessionManager.java:92) > at > eu.europeana.cloud.service.uis.database.dao.CassandraDataProviderDAO.getProviders(CassandraDataProviderDAO.java:92) > at > eu.europeana.cloud.service.uis.CassandraDataProviderService.getProviders(CassandraDataProviderService.java:34) > at > eu.europeana.cloud.service.uis.rest.DataProvidersResource.getProviders(DataProvidersResource.java:54) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:606) > at > org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) > at > org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:151) > at > org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:171) > at > org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:195) > at > org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:104) > at > org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:353) > at > org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:343) > at > org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) > at > org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:255) > at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) > at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) > at org.glassfish.jersey.internal.Errors.process(Errors.java:315) > at org.glassfish.jersey.internal.Errors.process(Errors.java:297) > at org.glassfish.jersey.internal.Errors.process(Errors.java:267) > at > org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:318) > at > org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:235) > at > org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:983) > at > org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:359) > at > org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:372) > at > org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:335) > at > org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:218) > at > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) > at > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > at > org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) > at > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) > at > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) > at > org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) > at > org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) > at > org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) > at > org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) > at > org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) > at > org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) > at > org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) > at > org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) > at > org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:193) > at > org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) > at > org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > at > org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) > at java.lang.Thread.run(Thread.java:745) > 2014-11-04 10:37:28,317 - ERROR: [Control connection] Cannot connect > to any host, scheduling retry > > The error usually occurs on only one of the application nodes > (sometimes two) but application on other nodes is working fine. > I cannot see any errors in Cassandra logs, so it looks like if it was > working ok. Cassandra and application servers are in the same server > room with a high throughput network, so connection shouldn't be a > problem - and my admin claims that it is not. But even if there was an > error in connection the driver should retry to connect, right? (that's > what its documentation says and I'm using default connection > parameters) > > I don't know where to look for the cause of the error. Is this a > matter of DataStax Driver or my code or rather Cassandra? > Any help appreciated. > Kind regards, > Ola >
