Connectivity issues to Yarn

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Nikhil Srinidhi

• November 02, 2016 14:00

I get this issue when running jobs: 

Call From cahostdameer.da.com/127.0.0.1 to dabda1node03.da.com:8032 failed on connection exception: java.net.ConnectException: Connection refus see: http://wiki.apache.org/hadoop/ConnectionRefused

Except pinging that YARN machine works.

[casysdadatameer@cahostdameer current]$ ping dabda1node03.da.com
PING dabda1node03.da.com (10.61.81.12) 56(84) bytes of data.
64 bytes from dabda1node03.da.com (10.61.81.12): icmp_seq=1 ttl=64 time=0.198 ms

Does this mean the connectivity issue is on the Datameer side? 

 

Any leads on where to start debugging?

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• 

  Gido

  • November 02, 2016 14:15

  A common cause for this is the specific service isn't running on that port or that machine. This might be caused by (incorrect) Configuration of High Availability.

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  Konsta Danyliuk

  • November 02, 2016 14:19

  Hello Nikhil,

  In addition to Gido's recommendation, I'd suggest to double check the following:

  • Ensure that RM host is up and running and you network connection is up as well. Most likely successful ping request will confirm this.
    
    
  • Ensure that Yarn service is running at target host on mentioned port.
    
    
  • Try to check connectivity to port 8032 via telnet
    e.g. telnet dabda1node03.da.com 8032
    
    
  • if you use Yarn High Availability, ensure that it ha been setup properly.
    
    

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  Nikhil Srinidhi

  • November 02, 2016 15:02

  Thank you! I realized telnet was not working and we were able to resolve it. 

  Appreciate the speedy responses :) 

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