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From Christian Smith <>
Subject Re: Ambari server claiming no heartbeats from agents
Date Sat, 07 Sep 2013 21:57:17 GMT
Hi Sumit,

It seems the clocks are off, I should have checked that earlier!  Thanks
for you help.


On Sun, Sep 8, 2013 at 1:38 AM, Sumit Mohanty <>wrote:

> Hi Christian,
> Heartbeat hostname not aligning with the registered hostname is the most
> likely reason.
> Try these API calls to confirm:
> curl –u user:passwd http://AmbariHost:8080/api/v1/hosts –this will tell
> you how many hosts are registered and their hostname (FQDN is what is
> typically used for registration)
> You can compare that with
> curl –u user:passwd
> http://AmbariHost:8080/api/v1/clusters/YourClusterName/hosts<http://AmbariHost:8080/api/v1/hosts>
> tells you the list of hosts that the cluster is associated with
> If indeed there is a hostname mismatch, you can modify the hostname on the
> host itself and restart the agent.
> If you can't modify the hostname for some reason, let us know. There is a
> way for ambari agents to override the host supplied hostname as well.
> However, the prior solution is preferred.
> -Sumit
> From: Christian Smith <>
> Reply-To: <>
> Date: Saturday, September 7, 2013 2:56 AM
> To: "" <>
> Subject: Ambari server claiming no heartbeats from agents
> Hi,
> I've got a new cluster configured via the API with HDFS and MR.  The
> configuration went fine and the HDFS service says its running.  However, on
> the hosts tab, all hosts are marked with a yellow circle and state that no
> heartbeat has been received for over 3 minutes.
> I've checked the agent and server logs and heartbeats are being sent and
> received by the expected parties.  So my question is what could be going
> wrong?  And how does the server associate a received heartbeat with a host
> in the cluster config?  Does the server to a reserve DNS lookup of the
> heartbeats source IP?  Or does the heartbeat contain the hostname of the
> agent?
> It seems like something around the heartbeat hostname is not aligned with
> what the server is expecting...
> Any ideas how to debug further?
> Cheers,
> Christian
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