I had a similar issue where ambari server got stuck in a weird state. It was technically running but could not collect any stats from the agents and in-turn it showed that the nodes are not running on the UI. I spent couple of days looking for a solution. Then based on the suggestion by @CS User above, I took a leap of faith and deleted all requests and corresponding data on ambari schema. Upon restarting the ambari-server, everything came back to normal. Thank you for the tip. Error on ambar-server.log -------- 07 Nov 2016 19:09:56,536 ERROR [qtp-ambari-agent-253] ContainerResponse:419 - The RuntimeException could not be mapped to a response, re-throwing to the HTTP container
java.lang.NullPointerException
at java.lang.String.replace(String.java:2240)
at org.apache.ambari.server.topology.HostRequest.getLogicalTasks(HostRequest.java:303)
at org.apache.ambari.server.topology.LogicalRequest.getCommands(LogicalRequest.java:158)
at org.apache.ambari.server.topology.LogicalRequest.getRequestStatus(LogicalRequest.java:231)
at org.apache.ambari.server.topology.TopologyManager.isLogicalRequestFinished(TopologyManager.java:812)
at org.apache.ambari.server.topology.TopologyManager.replayRequests(TopologyManager.java:766)
at org.apache.ambari.server.topology.TopologyManager.ensureInitialized(TopologyManager.java:150)
at org.apache.ambari.server.topology.TopologyManager.onHostRegistered(TopologyManager.java:407)
at org.apache.ambari.server.state.host.HostImpl$HostRegistrationReceived.transition(HostImpl.java:313)
at org.apache.ambari.server.state.host.HostImpl$HostRegistrationReceived.transition(HostImpl.java:275)
at org.apache.ambari.server.state.fsm.StateMachineFactory$SingleInternalArc.doTransition(StateMachineFactory.java:354)
at org.apache.ambari.server.state.fsm.StateMachineFactory.doTransition(StateMachineFactory.java:294)
at org.apache.ambari.server.state.fsm.StateMachineFactory.access$300(StateMachineFactory.java:39)
at org.apache.ambari.server.state.fsm.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:440)
at org.apache.ambari.server.state.host.HostImpl.handleEvent(HostImpl.java:584)
at org.apache.ambari.server.agent.HeartBeatHandler.handleRegistration(HeartBeatHandler.java:464)
at org.apache.ambari.server.agent.rest.AgentResource.register(AgentResource.java:95)
at sun.reflect.GeneratedMethodAccessor188.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1507)
at org.apache.ambari.server.security.SecurityFilter.doFilter(SecurityFilter.java:67)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1478)
at org.apache.ambari.server.api.AmbariPersistFilter.doFilter(AmbariPersistFilter.java:47)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1478)
at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:82)
at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:294)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1478)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:427)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:984)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1045)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:861)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:236)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SslConnection.handle(SslConnection.java:196)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:745) -------- Error on ambari-agent: ----------- Unable to connect to: https://<ambari-server-fqdn>:8441/agent/v1/register/<ambari-agent-fqdn>; Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/ambari_agent/Controller.py", line 165, in registerWithServer
ret = self.sendRequest(self.registerUrl, data)
File "/usr/lib/python2.6/site-packages/ambari_agent/Controller.py", line 499, in sendRequest
+ '; Response: ' + str(response)) <head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"/>
<title>Error 500 Server Error</title>
</head>
<body>
<h2>HTTP ERROR: 500</h2>
<p>Problem accessing /agent/v1/register/<ambari-agent-fqdn>. Reason:
<pre> Server Error</pre></p>
<hr /><i><small>Powered by Jetty:// 8.1.19.v20160209</small></i> ----------- Solution: Here is the (postgresql) query that I used. You have to run this as "ambari" user on the Ambari db. HDP version: 2.5 Ambari version: 2.4.0.1 Caution: Since you are touching ambari db directly, you are on your own. Note: I had to write individual queries to delete records from dependent tables first because CASCADE DELETE option was not turned on them.
delete from execution_command where task_id in (select task_id from host_role_command where stage_id in (select stage_id from stage where request_id in (select request_id from request))); delete from topology_logical_task where physical_task_id in (select task_id from host_role_command where stage_id in (select stage_id from stage where request_id in (select request_id from request))); delete from host_role_command where stage_id in (select stage_id from stage where request_id in (select request_id from request)); delete from stage where request_id in (select request_id from request); delete from requestresourcefilter where request_id in (select request_id from request); delete from requestoperationlevel where request_id in (select request_id from request); delete from request;
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