vinodkc opened a new pull request #32894:
URL: https://github.com/apache/spark/pull/32894


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   ### What changes were proposed in this pull request?
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   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 traces and it causes a 
more noisy warning for users.
    This PR aims to avoid printing full Exception Stack by just printing just 
Exception name and also a  suggestion message to disable `HBase Delegation 
Token generation` if HBase is not used in the Spark Application. 
   
   ### Why are the changes needed?
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     1. If you propose a new API, clarify the use case for a new API.
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   #### Before the fix
   ` spark-shell --master yarn
   .......
   .......
   21/06/12 14:29:41 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)
           at 
org.apache.spark.deploy.security.HBaseDelegationTokenProvider.obtainDelegationTokens(HBaseDelegationTokenProvider.
   scala:60)
           at 
org.apache.spark.deploy.security.HadoopDelegationTokenManager$$anonfun$6.apply(HadoopDelegationTokenManager.scala:
   166)
           at 
org.apache.spark.deploy.security.HadoopDelegationTokenManager$$anonfun$6.apply(HadoopDelegationTokenManager.scala:
   164)
           at 
scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
           at 
scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
           at scala.collection.Iterator$class.foreach(Iterator.scala:891)
           at scala.collection.AbstractIterator.foreach(Iterator.scala:1334)
           at 
scala.collection.MapLike$DefaultValuesIterable.foreach(MapLike.scala:206)
           at 
scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)
           at 
scala.collection.AbstractTraversable.flatMap(Traversable.scala:104)
           at 
org.apache.spark.deploy.security.HadoopDelegationTokenManager.obtainDelegationTokens(HadoopDelegationTokenManager.
   scala:164)`
   
   #### After  the fix
   ` spark-shell --master yarn
   Setting default log level to "WARN".
   To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use 
setLogLevel(newLevel).
   21/06/13 02:10:02 WARN security.HBaseDelegationTokenProvider: Failed to get 
token from service hbase due to  java.lang.reflect.InvocationTargetException 
Retrying to fetch HBase security token with hbase connection parameter.
   21/06/13 02:10:40 WARN security.HBaseDelegationTokenProvider: **Failed to 
get token from service hbase java.lang.reflect.InvocationTargetException. If 
HBase is not used, set spark.security.credentials.hbase.enabled to false**
   21/06/13 02:10:47 WARN cluster.YarnSchedulerBackend$YarnSchedulerEndpoint: 
Attempted to request executors before the AM has registered!`
   ### Does this PR introduce _any_ user-facing change?
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the documentation fix.
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   Yes, in the log, it avoids printing full Exception stack trace.
   
   ### How was this patch tested?
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   Tested manually as it can be verified only in a secure cluster 
   


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