[jira] [Created] (YARN-10516) In HA mode, when one Resource Manager has networking issue, getTokenService() should not throw runtime exception

["Xu Cang (Jira)" <ji...@apache.org>]

Xu Cang created YARN-10516:
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             Summary: In HA mode, when one Resource Manager has networking issue, getTokenService() should not throw runtime exception
                 Key: YARN-10516
                 URL: https://issues.apache.org/jira/browse/YARN-10516
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: client
            Reporter: Xu Cang


We have observed one issue from YARN client around this piece of code:

[https://github.com/apache/hadoop/blob/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/client/ClientRMProxy.java#L145]

 

While 

 
{code:java}
services.add(SecurityUtil.buildTokenService( yarnConf.getSocketAddr(address, defaultAddr, defaultPort)) .toString());
 
{code}
Is being called,  "yarnConf.getSocketAddr" will throw runtime exception, more specifically, UnknownHostException from here: [https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SecurityUtil.java#L466]
while one of the RM host was having networking issue that IP cannot be resolved.

This runtime exception then floats all the way into our application and cause MR job submission failed. 

In my opinion, since we have HA here, multiple RMs are still alive and available. We should catch this exception in  getTokenService() and handle it properly. 

Would like to hear your opinion on this, if agreed, I will provide a patch on this. Thank you.



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