Symptoms: Ambari-server.out logs a warning regarding A HTTP GET method : WARNING: A HTTP GET method, public javax.ws.rs.core.Response org.apache.ambari.server.api.services.StacksService.getStackVersions(java.lang.String,javax.ws.rs.core.HttpHeaders,javax.ws.rs.core.UriInfo,java.lang.String), should not consume any entity ... The Fix: Only after changing client.threadpool.size.max=<number of cores> in /etc/ambari-server/conf/ambari.properties to match the number you get from running nproc on the linux command line, then restarting Ambari-server, would the Ambari logon screen show. At Linux shell command line run 1. [root@SERVERNAME ~]# nproc Write down the number of core resulting from running nproc. Ex.g: 56 2. [root@SERVERNAME ~]# vi /etc/ambari-server/conf/ambari.properties Find client.threadpool.size.max=<number of cores>, then change to client.threadpool.size.max=56 3. [root@SERVERNAME ~]# ambari-server restart
That should resolve this particular issue on on REHL 7.X. Referencing AMBARI-9776;
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