[GitHub] attilapiros commented on issue #23801: [SPARK-26891][YARN] Fixing flaky test in YarnSchedulerBackendSuite

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attilapiros commented on issue #23801: [SPARK-26891][YARN] Fixing flaky test in YarnSchedulerBackendSuite
URL: https://github.com/apache/spark/pull/23801#issuecomment-464179868
 
 
   @vanzin in your PR [at the failed test](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/102369/testReport/org.apache.spark.scheduler.cluster/YarnSchedulerBackendSuite/RequestExecutors_reflects_node_blacklist_and_is_serializable/
   ) the exception's stacktrace was:
   
   ```
   at org.apache.spark.scheduler.cluster.YarnSchedulerBackendSuite.$anonfun$new$4(YarnSchedulerBackendSuite.scala:54)
   	at scala.collection.Iterator.foreach(Iterator.scala:941)
   	at scala.collection.Iterator.foreach$(Iterator.scala:941)
   	at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
   	at scala.collection.IterableLike.foreach(IterableLike.scala:74)
   	at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
   	at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
   	at org.apache.spark.scheduler.cluster.YarnSchedulerBackendSuite.$anonfun$new$3(YarnSchedulerBackendSuite.scala:48)
   	at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:158)
   	at org.apache.spark.scheduler.cluster.YarnSchedulerBackendSuite.$anonfun$new$2(YarnSchedulerBackendSuite.scala:47)
   ```
    Based on the exception the problematic line is (YarnSchedulerBackendSuite.scala:54): 
   
   ```
         when(sched.nodeBlacklist()).thenReturn(blacklist)	
   ```
   
   I see there is SparkContext access in the 2nd test as well but I do not see failures for that one. On the other hand I have seen this failed more then once. 
   
   

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