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simon123
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Re: Ambari displays heartbeat lost on all hosts

by New Contributor in Support Questions
‎03-05-2018 05:37 PM
‎03-05-2018 05:37 PM
HI @Jay Kumar SenSharma, Thanks for the reply. By setting the hostname of the machine running the ambari-server service, in the "/etc/hosts" file of each host machine, helped to solve the problem. Quick question: in the "/etc/hosts" file of each host machine, shall I only set the hostname of the machine running the ambari-server service, or shall I also write the hostname of the all hosts? Because my cluster is composed by serveral machines, and different services, such as, YARN, Spark, Mapreduce< HIVE etc. are running on different machines (for example, some machine are Nodemanager, other machine run the Hive server etc.). ... View more

Ambari displays heartbeat lost on all hosts

by New Contributor in Support Questions
‎03-04-2018 11:18 PM
‎03-04-2018 11:18 PM
Suddenly, Ambari displayed heartbeat lost on all hosts as the following picture shows: I have tried to generate a new certificate for each host as showed at this link but it does not help. Fyi, on all my hosts the folder `/var/lib/ambari-agent/keys` is empty. If I execute the command `sudo ambari-agent start` I get the following error: Verifying Python version compatibility... Using python /usr/bin/python Checking for previously running Ambari Agent... /run/ambari-agent/ambari-agent.pid found with no process. Removing 3439... Starting ambari-agent Verifying ambari-agent process status... ERROR: ambari-agent start failed. For more details, see /var/log/ambari-agent/ambari-agent.out: ==================== Traceback (most recent call last): File "/usr/lib/python2.6/site-packages/ambari_agent/main.py", line 387, in <module> main(heartbeat_stop_callback) File "/usr/lib/python2.6/site-packages/ambari_agent/main.py", line 355, in main (retries, connected, stopped) = netutil.try_to_connect(server_url, MAX_RETRIES, logger) UnboundLocalError: local variable 'server_url' referenced before assignment ==================== ... View more
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