Team,
When I checked ambari logs then I see following error, any idea why we have this error message ?
01 Mar 2017 05:40:06,209 ERROR [ambari-metrics-retrieval-service-thread-1] MetricsRetrievalService:421 - Unable to retrieve metrics from http://m2.hdp22:8744/api/v1/topology/summary?field=topologies. Subsequent failures will be suppressed from the log for 20 minutes.
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:996)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1300)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
at org.apache.ambari.server.controller.internal.URLStreamProvider.processURL(URLStreamProvider.java:218)
at org.apache.ambari.server.controller.internal.URLStreamProvider.processURL(URLStreamProvider.java:142)
at org.apache.ambari.server.controller.internal.URLStreamProvider.readFrom(URLStreamProvider.java:116)
at org.apache.ambari.server.controller.internal.URLStreamProvider.readFrom(URLStreamProvider.java:121)
at org.apache.ambari.server.state.services.MetricsRetrievalService$MetricRunnable.run(MetricsRetrievalService.java:382)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
01 Mar 2017 05:46:02,006 WARN [ambari-client-thread-138] Errors:173 - The following warnings have been detected with resource and/or provider classes