Hi! -- I have a HDP-2.4 cluster installed on Google Cloud that has been working well until now - a month after first installation. The installation was done following the steps given here. After installation, ambari allowed me to add new services and monitor the cluster. Short after initial installation, I added Zeppelin without problems according to the instructions given here. There was no problem restarting ambari and Zeppelin worked just fine. The issues started this past Friday, right after adding Hue following the instructions given here. After restarting ambari server and agents, the ambari GUI reported "lost heartbeat" everywhere. Several restarts of both ambari server and agent did not help. So I went to the log files. The ambari-server.log is full of this repeating pattern: 15 May 2017 07:16:10,841 INFO [qtp-ambari-client-25] MetricsReportPropertyProvider:153 - METRICS_COLLECTOR is not live. Skip populating resources with metrics, next message will be logged after 1000 attempts. 15 May 2017 07:16:14,000 INFO [qtp-ambari-agent-3887] HeartBeatHandler:927 - agentOsType = centos6 15 May 2017 07:16:14,015 ERROR [qtp-ambari-client-26] ReadHandler:91 - Caught a runtime exception executing a query java.lang.NullPointerException 15 May 2017 07:16:14,016 WARN [qtp-ambari-client-26] ServletHandler:563 - /api/v1/clusters/hadoop/requests java.lang.NullPointerException 15 May 2017 07:16:14,067 INFO [qtp-ambari-agent-3887] HostImpl:285 - Received host registration, host=[hostname=hadoop-w-1,fqdn=hadoop-w-1.c.hdp-1-163209.internal,domain=c.hdp-1-163209.internal,architecture=x86_64,processorcount=2,physicalprocessorcount=2,osname=centos,osversion=6.8,osfamily=redhat,memory=7543344,uptime_hours=0,mounts=(available=37036076,mountpoint=/,used=11816500,percent=25%,size=51473368,device=/dev/sda1,type=ext4)(available=3771672,mountpoint=/dev/shm,used=0,percent=0%,size=3771672,device=tmpfs,type=tmpfs)(available=498928440,mountpoint=/mnt/pd1,used=2544104,percent=1%,size=528316088,device=/dev/sdb,type=ext4)] , registrationTime=1494832574000, agentVersion=2.2.1.0 15 May 2017 07:16:14,076 WARN [qtp-ambari-agent-3887] ServletHandler:563 - /agent/v1/register/hadoop-w-1.c.hdp-1-163209.internal java.lang.NullPointerException 15 May 2017 07:16:20,054 ERROR [qtp-ambari-client-22] ReadHandler:91 - Caught a runtime exception executing a query java.lang.NullPointerException 15 May 2017 07:16:20,055 WARN [qtp-ambari-client-22] ServletHandler:563 - /api/v1/clusters/hadoop/requests java.lang.NullPointerException 15 May 2017 07:16:22,139 INFO [qtp-ambari-agent-3863] HeartBeatHandler:927 - agentOsType = centos6 15 May 2017 07:16:22,156 INFO [qtp-ambari-agent-3863] HostImpl:285 - Received host registration, host=[hostname=hadoop-w-1,fqdn=hadoop-w-1.c.hdp-1-163209.internal,domain=c.hdp-1-163209.internal,architecture=x86_64,processorcount=2,physicalprocessorcount=2,osname=centos,osversion=6.8,osfamily=redhat,memory=7543344,uptime_hours=0,mounts=(available=37036076,mountpoint=/,used=11816500,percent=25%,size=51473368,device=/dev/sda1,type=ext4)(available=3771672,mountpoint=/dev/shm,used=0,percent=0%,size=3771672,device=tmpfs,type=tmpfs)(available=498928440,mountpoint=/mnt/pd1,used=2544104,percent=1%,size=528316088,device=/dev/sdb,type=ext4)] , registrationTime=1494832582139, agentVersion=2.2.1.0 15 May 2017 07:16:22,159 WARN [qtp-ambari-agent-3863] ServletHandler:563 - /agent/v1/register/hadoop-w-1.c.hdp-1-163209.internal java.lang.NullPointerException 15 May 2017 07:16:25,161 INFO [qtp-ambari-client-22] MetricsReportPropertyProvider:153 - METRICS_COLLECTOR is not live. Skip populating resources with metrics, next message will be logged after 1000 attempts. 15 May 2017 07:16:25,174 INFO [qtp-ambari-client-21] MetricsReportPropertyProvider:153 - METRICS_COLLECTOR is not live. Skip populating resources with metrics, next message will be logged after 1000 attempts. 15 May 2017 07:16:26,093 ERROR [qtp-ambari-client-22] ReadHandler:91 - Caught a runtime exception executing a query java.lang.NullPointerException 15 May 2017 07:16:26,094 WARN [qtp-ambari-client-22] ServletHandler:563 - /api/v1/clusters/hadoop/requests java.lang.NullPointerException The ambari-server.out is full of: May 15, 2017 7:16:59 AM com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container java.lang.NullPointerException The ambari-agent.log is full of: INFO 2017-05-15 07:17:57,014 security.py:99 - SSL Connect being called.. connecting to the server ERROR 2017-05-15 07:17:57,015 Controller.py:197 - Unable to connect to: https://hadoop-m:8441/agent/v1/register/hadoop-m.c.hdp-1-163209.internal Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/ambari_agent/Controller.py", line 150, in registerWithServer ret = self.sendRequest(self.registerUrl, data) File "/usr/lib/python2.6/site-packages/ambari_agent/Controller.py", line 425, in sendRequest raise IOError('Request to {0} failed due to {1}'.format(url, str(exception))) IOError: Request to https://hadoop-m:8441/agent/v1/register/hadoop-m.c.hdp-1-163209.internal failed due to [Errno 111] Connection refused ERROR 2017-05-15 07:17:57,015 Controller.py:198 - Error:Request to https://hadoop-m:8441/agent/v1/register/hadoop-m.c.hdp-1-163209.internal failed due to [Errno 111] Connection refused WARNING 2017-05-15 07:17:57,015 Controller.py:199 - Sleeping for 18 seconds and then trying again The ambari-agent.out is full of: ERROR 2017-05-15 06:57:24,691 Controller.py:197 - Unable to connect to: https://hadoop-m:8441/agent/v1/register/hadoop-m.c.hdp-1-163209.internal Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/ambari_agent/Controller.py", line 150, in registerWithServer ret = self.sendRequest(self.registerUrl, data) File "/usr/lib/python2.6/site-packages/ambari_agent/Controller.py", line 428, in sendRequest + '; Response: ' + str(response)) IOError: Response parsing failed! Request data: {"hardwareProfile": {"kernel": "Linux", "domain": "c.hdp-1-163209.internal", "physicalprocessorcount": 4, "kernelrelease": "2.6.32-642.15.1.el6.x86_64", "uptime_days": "0", "memorytotal": 15300920, "swapfree": "0.00 GB", "memorysize": 15300920, "osfamily": "redhat", "swapsize": "0.00 GB", "processorcount": 4, "netmask": "255.255.255.255", "timezone": "UTC", "hardwareisa": "x86_64", "memoryfree": 14113788, "operatingsystem": "centos", "kernelmajversion": "2.6", "kernelversion": "2.6.32", "macaddress": "42:01:0A:84:00:04", "operatingsystemrelease": "6.8", "ipaddress": "10.132.0.4", "hostname": "hadoop-m", "uptime_hours": "0", "fqdn": "hadoop-m.c.hdp-1-163209.internal", "id": "root", "architecture": "x86_64", "selinux": false, "mounts": [{"available": "37748016", "used": "11104560", "percent": "23%", "device": "/dev/sda1", "mountpoint": "/", "type": "ext4", "size": "51473368"}, {"available": "7650460", "used": "0", "percent": "0%", "device": "tmpfs", "mountpoint": "/dev/shm", "type": "tmpfs", "size": "7650460"}, {"available": "499130312", "used": "2342232", "percent": "1%", "device": "/dev/sdb", "mountpoint": "/mnt/pd1", "type": "ext4", "size": "528316088"}], "hardwaremodel": "x86_64", "uptime_seconds": "109", "interfaces": "eth0,lo"}, "currentPingPort": 8670, "prefix": "/var/lib/ambari-agent/data", "agentVersion": "2.2.1.0", "agentEnv": {"transparentHugePage": "never", "hostHealth": {"agentTimeStampAtReporting": 1494831444579, "activeJavaProcs": [], "liveServices": [{"status": "Healthy", "name": "ntpd", "desc": ""}]}, "reverseLookup": true, "alternatives": [], "umask": "18", "firewallName": "iptables", "stackFoldersAndFiles": [{"type": "directory", "name": "/etc/hadoop"}, {"type": "directory", "name": "/etc/hbase"}, {"type": "directory", "name": "/etc/hive"}, {"type": "directory", "name": "/etc/ganglia"}, {"type": "directory", "name": "/etc/oozie"}, {"type": "directory", "name": "/etc/sqoop"}, {"type": "directory", "name": "/etc/zookeeper"}, {"type": "directory", "name": "/etc/flume"}, {"type": "directory", "name": "/etc/storm"}, {"type": "directory", "name": "/etc/hive-hcatalog"}, {"type": "directory", "name": "/etc/tez"}, {"type": "directory", "name": "/etc/falcon"}, {"type": "directory", "name": "/etc/hive-webhcat"}, {"type": "directory", "name": "/etc/kafka"}, {"type": "directory", "name": "/etc/slider"}, {"type": "directory", "name": "/etc/storm-slider-client"}, {"type": "directory", "name": "/etc/mahout"}, {"type": "directory", "name": "/etc/spark"}, {"type": "directory", "name": "/etc/pig"}, {"type": "directory", "name": "/etc/accumulo"}, {"type": "directory", "name": "/etc/ambari-metrics-monitor"}, {"type": "directory", "name": "/etc/atlas"}, {"type": "directory", "name": "/var/run/hadoop"}, {"type": "directory", "name": "/var/run/hbase"}, {"type": "directory", "name": "/var/run/hive"}, {"type": "directory", "name": "/var/run/ganglia"}, {"type": "directory", "name": "/var/run/oozie"}, {"type": "directory", "name": "/var/run/sqoop"}, {"type": "directory", "name": "/var/run/zookeeper"}, {"type": "directory", "name": "/var/run/flume"}, {"type": "directory", "name": "/var/run/storm"}, {"type": "directory", "name": "/var/run/hive-hcatalog"}, {"type": "directory", "name": "/var/run/falcon"}, {"type": "directory", "name": "/var/run/webhcat"}, {"type": "directory", "name": "/var/run/hadoop-yarn"}, {"type": "directory", "name": "/var/run/hadoop-mapreduce"}, {"type": "directory", "name": "/var/run/kafka"}, {"type": "directory", "name": "/var/run/spark"}, {"type": "directory", "name": "/var/run/accumulo"}, {"type": "directory", "name": "/var/run/ambari-metrics-monitor"}, {"type": "directory", "name": "/var/run/atlas"}, {"type": "directory", "name": "/var/log/hadoop"}, {"type": "directory", "name": "/var/log/hbase"}, {"type": "directory", "name": "/var/log/hive"}, {"type": "directory", "name": "/var/log/oozie"}, {"type": "directory", "name": "/var/log/sqoop"}, {"type": "directory", "name": "/var/log/zookeeper"}, {"type": "directory", "name": "/var/log/flume"}, {"type": "directory", "name": "/var/log/storm"}, {"type": "directory", "name": "/var/log/hive-hcatalog"}, {"type": "directory", "name": "/var/log/falcon"}, {"type": "directory", "name": "/var/log/hadoop-yarn"}, {"type": "directory", "name": "/var/log/hadoop-mapreduce"}, {"type": "directory", "name": "/var/log/kafka"}, {"type": "directory", "name": "/var/log/spark"}, {"type": "directory", "name": "/var/log/accumulo"}, {"type": "directory", "name": "/var/log/ambari-metrics-monitor"}, {"type": "directory", "name": "/var/log/atlas"}, {"type": "directory", "name": "/usr/lib/flume"}, {"type": "directory", "name": "/usr/lib/storm"}, {"type": "directory", "name": "/var/lib/hive"}, {"type": "directory", "name": "/var/lib/ganglia"}, {"type": "directory", "name": "/var/lib/oozie"}, {"type": "sym_link", "name": "/var/lib/hdfs"}, {"type": "directory", "name": "/var/lib/flume"}, {"type": "directory", "name": "/var/lib/hadoop-hdfs"}, {"type": "directory", "name": "/var/lib/hadoop-yarn"}, {"type": "directory", "name": "/var/lib/hadoop-mapreduce"}, {"type": "directory", "name": "/var/lib/slider"}, {"type": "directory", "name": "/var/lib/ganglia-web"}, {"type": "directory", "name": "/var/lib/spark"}, {"type": "directory", "name": "/var/lib/atlas"}, {"type": "directory", "name": "/hadoop/zookeeper"}, {"type": "directory", "name": "/hadoop/hdfs"}, {"type": "directory", "name": "/hadoop/storm"}, {"type": "directory", "name": "/hadoop/falcon"}, {"type": "directory", "name": "/hadoop/yarn"}, {"type": "directory", "name": "/kafka-logs"}], "existingUsers": [{"status": "Available", "name": "hadoop", "homeDir": "/home/hadoop"}, {"status": "Available", "name": "oozie", "homeDir": "/home/oozie"}, {"status": "Available", "name": "hive", "homeDir": "/home/hive"}, {"status": "Available", "name": "ambari-qa", "homeDir": "/home/ambari-qa"}, {"status": "Available", "name": "flume", "homeDir": "/home/flume"}, {"status": "Available", "name": "hdfs", "homeDir": "/home/hdfs"}, {"status": "Available", "name": "storm", "homeDir": "/home/storm"}, {"status": "Available", "name": "spark", "homeDir": "/home/spark"}, {"status": "Available", "name": "mapred", "homeDir": "/home/mapred"}, {"status": "Available", "name": "accumulo", "homeDir": "/home/accumulo"}, {"status": "Available", "name": "hbase", "homeDir": "/home/hbase"}, {"status": "Available", "name": "tez", "homeDir": "/home/tez"}, {"status": "Available", "name": "zookeeper", "homeDir": "/home/zookeeper"}, {"status": "Available", "name": "mahout", "homeDir": "/home/mahout"}, {"status": "Available", "name": "kafka", "homeDir": "/home/kafka"}, {"status": "Available", "name": "falcon", "homeDir": "/home/falcon"}, {"status": "Available", "name": "sqoop", "homeDir": "/home/sqoop"}, {"status": "Available", "name": "yarn", "homeDir": "/home/yarn"}, {"status": "Available", "name": "hcat", "homeDir": "/home/hcat"}, {"status": "Available", "name": "ams", "homeDir": "/home/ams"}, {"status": "Available", "name": "atlas", "homeDir": "/home/atlas"}], "firewallRunning": false}, "timestamp": 1494831444521, "hostname": "hadoop-m.c.hdp-1-163209.internal", "responseId": -1, "publicHostname": "hadoop-m.c.hdp-1-163209.internal"}; Response: <html> <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/hadoop-m.c.hdp-1-163209.internal. Reason: <pre> Server Error</pre></p> <hr /><i><small>Powered by Jetty://</small></i> p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #000000; background-color: #ffffff} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #000000; background-color: #ffffff; min-height: 13.0px} span.s1 {font-variant-ligatures: no-common-ligatures} </body> </html> ERROR 2017-05-15 06:57:24,694 Controller.py:198 - Error:Response parsing failed! Request data: {"hardwareProfile": {"kernel": "Linux", "domain": "c.hdp-1-163209.internal", "physicalprocessorcount": 4, "kernelrelease": "2.6.32-642.15.1.el6.x86_64", "uptime_days": "0", "memorytotal": 15300920, "swapfree": "0.00 GB", "memorysize": 15300920, "osfamily": "redhat", "swapsize": "0.00 GB", "processorcount": 4, "netmask": "255.255.255.255", "timezone": "UTC", "hardwareisa": "x86_64", "memoryfree": 14113788, "operatingsystem": "centos", "kernelmajversion": "2.6", "kernelversion": "2.6.32", "macaddress": "42:01:0A:84:00:04", "operatingsystemrelease": "6.8", "ipaddress": "10.132.0.4", "hostname": "hadoop-m", "uptime_hours": "0", "fqdn": "hadoop-m.c.hdp-1-163209.internal", "id": "root", "architecture": "x86_64", "selinux": false, "mounts": [{"available": "37748016", "used": "11104560", "percent": "23%", "device": "/dev/sda1", "mountpoint": "/", "type": "ext4", "size": "51473368"}, {"available": "7650460", "used": "0", "percent": "0%", "device": "tmpfs", "mountpoint": "/dev/shm", "type": "tmpfs", "size": "7650460"}, {"available": "499130312", "used": "2342232", "percent": "1%", "device": "/dev/sdb", "mountpoint": "/mnt/pd1", "type": "ext4", "size": "528316088"}], "hardwaremodel": "x86_64", "uptime_seconds": "109", "interfaces": "eth0,lo"}, "currentPingPort": 8670, "prefix": "/var/lib/ambari-agent/data", "agentVersion": "2.2.1.0", "agentEnv": {"transparentHugePage": "never", "hostHealth": {"agentTimeStampAtReporting": 1494831444579, "activeJavaProcs": [], "liveServices": [{"status": "Healthy", "name": "ntpd", "desc": ""}]}, "reverseLookup": true, "alternatives": [], "umask": "18", "firewallName": "iptables", "stackFoldersAndFiles": [{"type": "directory", "name": "/etc/hadoop"}, {"type": "directory", "name": "/etc/hbase"}, {"type": "directory", "name": "/etc/hive"}, {"type": "directory", "name": "/etc/ganglia"}, {"type": "directory", "name": "/etc/oozie"}, {"type": "directory", "name": "/etc/sqoop"}, {"type": "directory", "name": "/etc/zookeeper"}, {"type": "directory", "name": "/etc/flume"}, {"type": "directory", "name": "/etc/storm"}, {"type": "directory", "name": "/etc/hive-hcatalog"}, {"type": "directory", "name": "/etc/tez"}, {"type": "directory", "name": "/etc/falcon"}, {"type": "directory", "name": "/etc/hive-webhcat"}, {"type": "directory", "name": "/etc/kafka"}, {"type": "directory", "name": "/etc/slider"}, {"type": "directory", "name": "/etc/storm-slider-client"}, {"type": "directory", "name": "/etc/mahout"}, {"type": "directory", "name": "/etc/spark"}, {"type": "directory", "name": "/etc/pig"}, {"type": "directory", "name": "/etc/accumulo"}, {"type": "directory", "name": "/etc/ambari-metrics-monitor"}, {"type": "directory", "name": "/etc/atlas"}, {"type": "directory", "name": "/var/run/hadoop"}, {"type": "directory", "name": "/var/run/hbase"}, {"type": "directory", "name": "/var/run/hive"}, {"type": "directory", "name": "/var/run/ganglia"}, {"type": "directory", "name": "/var/run/oozie"}, {"type": "directory", "name": "/var/run/sqoop"}, {"type": "directory", "name": "/var/run/zookeeper"}, {"type": "directory", "name": "/var/run/flume"}, {"type": "directory", "name": "/var/run/storm"}, {"type": "directory", "name": "/var/run/hive-hcatalog"}, {"type": "directory", "name": "/var/run/falcon"}, {"type": "directory", "name": "/var/run/webhcat"}, {"type": "directory", "name": "/var/run/hadoop-yarn"}, {"type": "directory", "name": "/var/run/hadoop-mapreduce"}, {"type": "directory", "name": "/var/run/kafka"}, {"type": "directory", "name": "/var/run/spark"}, {"type": "directory", "name": "/var/run/accumulo"}, {"type": "directory", "name": "/var/run/ambari-metrics-monitor"}, {"type": "directory", "name": "/var/run/atlas"}, {"type": "directory", "name": "/var/log/hadoop"}, {"type": "directory", "name": "/var/log/hbase"}, {"type": "directory", "name": "/var/log/hive"}, {"type": "directory", "name": "/var/log/oozie"}, {"type": "directory", "name": "/var/log/sqoop"}, {"type": "directory", "name": "/var/log/zookeeper"}, {"type": "directory", "name": "/var/log/flume"}, {"type": "directory", "name": "/var/log/storm"}, {"type": "directory", "name": "/var/log/hive-hcatalog"}, {"type": "directory", "name": "/var/log/falcon"}, {"type": "directory", "name": "/var/log/hadoop-yarn"}, {"type": "directory", "name": "/var/log/hadoop-mapreduce"}, {"type": "directory", "name": "/var/log/kafka"}, {"type": "directory", "name": "/var/log/spark"}, {"type": "directory", "name": "/var/log/accumulo"}, {"type": "directory", "name": "/var/log/ambari-metrics-monitor"}, {"type": "directory", "name": "/var/log/atlas"}, {"type": "directory", "name": "/usr/lib/flume"}, {"type": "directory", "name": "/usr/lib/storm"}, {"type": "directory", "name": "/var/lib/hive"}, {"type": "directory", "name": "/var/lib/ganglia"}, {"type": "directory", "name": "/var/lib/oozie"}, {"type": "sym_link", "name": "/var/lib/hdfs"}, {"type": "directory", "name": "/var/lib/flume"}, {"type": "directory", "name": "/var/lib/hadoop-hdfs"}, {"type": "directory", "name": "/var/lib/hadoop-yarn"}, {"type": "directory", "name": "/var/lib/hadoop-mapreduce"}, {"type": "directory", "name": "/var/lib/slider"}, {"type": "directory", "name": "/var/lib/ganglia-web"}, {"type": "directory", "name": "/var/lib/spark"}, {"type": "directory", "name": "/var/lib/atlas"}, {"type": "directory", "name": "/hadoop/zookeeper"}, {"type": "directory", "name": "/hadoop/hdfs"}, {"type": "directory", "name": "/hadoop/storm"}, {"type": "directory", "name": "/hadoop/falcon"}, {"type": "directory", "name": "/hadoop/yarn"}, {"type": "directory", "name": "/kafka-logs"}], "existingUsers": [{"status": "Available", "name": "hadoop", "homeDir": "/home/hadoop"}, {"status": "Available", "name": "oozie", "homeDir": "/home/oozie"}, {"status": "Available", "name": "hive", "homeDir": "/home/hive"}, {"status": "Available", "name": "ambari-qa", "homeDir": "/home/ambari-qa"}, {"status": "Available", "name": "flume", "homeDir": "/home/flume"}, {"status": "Available", "name": "hdfs", "homeDir": "/home/hdfs"}, {"status": "Available", "name": "storm", "homeDir": "/home/storm"}, {"status": "Available", "name": "spark", "homeDir": "/home/spark"}, {"status": "Available", "name": "mapred", "homeDir": "/home/mapred"}, {"status": "Available", "name": "accumulo", "homeDir": "/home/accumulo"}, {"status": "Available", "name": "hbase", "homeDir": "/home/hbase"}, {"status": "Available", "name": "tez", "homeDir": "/home/tez"}, {"status": "Available", "name": "zookeeper", "homeDir": "/home/zookeeper"}, {"status": "Available", "name": "mahout", "homeDir": "/home/mahout"}, {"status": "Available", "name": "kafka", "homeDir": "/home/kafka"}, {"status": "Available", "name": "falcon", "homeDir": "/home/falcon"}, {"status": "Available", "name": "sqoop", "homeDir": "/home/sqoop"}, {"status": "Available", "name": "yarn", "homeDir": "/home/yarn"}, {"status": "Available", "name": "hcat", "homeDir": "/home/hcat"}, {"status": "Available", "name": "ams", "homeDir": "/home/ams"}, {"status": "Available", "name": "atlas", "homeDir": "/home/atlas"}], "firewallRunning": false}, "timestamp": 1494831444521, "hostname": "hadoop-m.c.hdp-1-163209.internal", "responseId": -1, "publicHostname": "hadoop-m.c.hdp-1-163209.internal"}; Response: <html> <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/hadoop-m.c.hdp-1-163209.internal. Reason: <pre> Server Error</pre></p> <hr /><i><small>Powered by Jetty://</small></i> p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #000000; background-color: #ffffff} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #000000; background-color: #ffffff; min-height: 13.0px} span.s1 {font-variant-ligatures: no-common-ligatures} </body> </html> WARNING 2017-05-15 06:57:24,694 Controller.py:199 - Sleeping for 24 seconds and then trying again WARNING 2017-05-15 06:57:37,965 base_alert.py:417 - [Alert][namenode_rpc_latency] HA nameservice value is present but there are no aliases for {{hdfs-site/dfs.ha.namenodes.{{ha-nameservice}}}} WARNING 2017-05-15 06:57:37,966 base_alert.py:417 - [Alert][namenode_hdfs_blocks_health] HA nameservice value is present but there are no aliases for {{hdfs-site/dfs.ha.namenodes.{{ha-nameservice}}}} WARNING 2017-05-15 06:57:37,970 base_alert.py:417 - [Alert][namenode_hdfs_pending_deletion_blocks] HA nameservice value is present but there are no aliases for {{hdfs-site/dfs.ha.namenodes.{{ha-nameservice}}}} WARNING 2017-05-15 06:57:37,972 base_alert.py:417 - [Alert][namenode_webui] HA nameservice value is present but there are no aliases for {{hdfs-site/dfs.ha.namenodes.{{ha-nameservice}}}} WARNING 2017-05-15 06:57:37,973 base_alert.py:417 - [Alert][datanode_health_summary] HA nameservice value is present but there are no aliases for {{hdfs-site/dfs.ha.namenodes.{{ha-nameservice}}}} WARNING 2017-05-15 06:57:37,977 base_alert.py:140 - [Alert][namenode_rpc_latency] Unable to execute alert. [Alert][namenode_rpc_latency] Unable to extract JSON from JMX response WARNING 2017-05-15 06:57:37,980 base_alert.py:140 - [Alert][namenode_hdfs_blocks_health] Unable to execute alert. [Alert][namenode_hdfs_blocks_health] Unable to extract JSON from JMX response WARNING 2017-05-15 06:57:37,982 base_alert.py:140 - [Alert][namenode_hdfs_pending_deletion_blocks] Unable to execute alert. [Alert][namenode_hdfs_pending_deletion_blocks] Unable to extract JSON from JMX response WARNING 2017-05-15 06:57:37,984 base_alert.py:417 - [Alert][namenode_hdfs_capacity_utilization] HA nameservice value is present but there are no aliases for {{hdfs-site/dfs.ha.namenodes.{{ha-nameservice}}}} WARNING 2017-05-15 06:57:37,986 base_alert.py:140 - [Alert][datanode_health_summary] Unable to execute alert. [Alert][datanode_health_summary] Unable to extract JSON from JMX response INFO 2017-05-15 06:57:37,986 logger.py:67 - Mount point for directory /hadoop/hdfs/data is / WARNING 2017-05-15 06:57:37,990 base_alert.py:417 - [Alert][namenode_directory_status] HA nameservice value is present but there are no aliases for {{hdfs-site/dfs.ha.namenodes.{{ha-nameservice}}}} WARNING 2017-05-15 06:57:38,004 base_alert.py:140 - [Alert][regionservers_health_summary] Unable to execute alert. [Alert][regionservers_health_summary] Unable to extract JSON from JMX response WARNING 2017-05-15 06:57:38,005 base_alert.py:140 - [Alert][datanode_storage] Unable to execute alert. [Alert][datanode_storage] Unable to extract JSON from JMX response WARNING 2017-05-15 06:57:38,007 base_alert.py:140 - [Alert][namenode_hdfs_capacity_utilization] Unable to execute alert. [Alert][namenode_hdfs_capacity_utilization] Unable to extract JSON from JMX response WARNING 2017-05-15 06:57:38,012 base_alert.py:140 - [Alert][namenode_directory_status] Unable to execute alert. [Alert][namenode_directory_status] Unable to extract JSON from JMX response INFO 2017-05-15 06:57:38,016 logger.py:67 - Pid file /var/run/ambari-metrics-monitor/ambari-metrics-monitor.pid is empty or does not exist ERROR 2017-05-15 06:57:38,017 script_alert.py:112 - [Alert][yarn_nodemanager_health] Failed with result CRITICAL: ['Connection failed to http://hadoop-m.c.hdp-1-163209.internal:8042/ws/v1/node/info (Traceback (most recent call last):\n File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/alerts/alert_nodemanager_health.py", line 165, in execute\n url_response = urllib2.urlopen(query, timeout=connection_timeout)\n File "/usr/lib64/python2.6/urllib2.py", line 126, in urlopen\n return _opener.open(url, data, timeout)\n File "/usr/lib64/python2.6/urllib2.py", line 391, in open\n response = self._open(req, data)\n File "/usr/lib64/python2.6/urllib2.py", line 409, in _open\n \'_open\', req)\n File "/usr/lib64/python2.6/urllib2.py", line 369, in _call_chain\n result = func(*args)\n File "/usr/lib64/python2.6/urllib2.py", line 1190, in http_open\n return self.do_open(httplib.HTTPConnection, req)\n File "/usr/lib64/python2.6/urllib2.py", line 1165, in do_open\n raise URLError(err)\nURLError: <urlopen error [Errno 111] Connection refused>\n)'] ERROR 2017-05-15 06:57:38,017 script_alert.py:112 - [Alert][ams_metrics_monitor_process] Failed with result CRITICAL: ['Ambari Monitor is NOT running on hadoop-m.c.hdp-1-163209.internal'] The log files are getting pretty big, specially the ambari-server.log: @hadoop-m ~]$ ls -l /var/log/ambari-server/ total 53912 -rw-r--r--. 1 root root 132186 May 14 04:00 ambari-alerts.log -rw-r--r--. 1 root root 26258 May 3 13:35 ambari-config-changes.log -rw-r--r--. 1 root root 38989 May 12 15:46 ambari-eclipselink.log -rw-r--r--. 1 root root 45011535 May 15 07:17 ambari-server.log -rw-r--r--. 1 root root 9967341 May 15 07:17 ambari-server.out The cluster is still in preparation phase and is therefore small, just a master node and two worker nodes. A restart of the virtual machines corresponding to each node did not help either. The ambari GUI with "lost heartbeat" everywhere looks like this e.g. for HDFS: I've tried every single trick that I've found in community posts, although I haven't seen any report (yet) with a problem like mine, i.e., with NPE and heartbeat loss after ambari-server (and agents) restart. Thanks in advance for comments and possible guidance. ... View more