Vinod KC created SPARK-35747:
--------------------------------

             Summary: Avoid printing full Exception stack trace, if HBase 
service is not running in a secure cluster 
                 Key: SPARK-35747
                 URL: https://issues.apache.org/jira/browse/SPARK-35747
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 3.1.2, 3.1.0, 3.0.0
            Reporter: Vinod KC


In a secure Yarn cluster where HBase service is down, even if the spark 
application is not using HBase, during the application submit stage, 
HBaseDelegationTokenProvider prints full Exception Stack trace and it causes a 
noisy warning.

 
{code:java}
WARN security.HBaseDelegationTokenProvider: Failed to get token from service 
hbase
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.apache.spark.deploy.security.HBaseDelegationTokenProvider.obtainDelegationTokensWithHBaseConn(HBaseDelegationT
okenProvider.scala:93)
{code}

Also, Application submission taking more time as 
`HBaseDelegationTokenProvider.obtainDelegationTokensWithHBaseConn` retries the 
connection to HBase master multiple times before it gives up. This slows down 
the application submission steps. Hence, if HBase is not used in the user 
Application, it is better to suggest user to disable HBase Delegation Token 
generation. 

ie, spark.security.credentials.hbase.enabled=false

 



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