Github user dongjoon-hyun commented on the issue:

    https://github.com/apache/spark/pull/21093
  
    @gatorsmile . Sorry for late response. I'm currently at Dataworks Summit 
Berlin.
    
    I took a look. It seems that the last two failures are due to 
`JsonInferSchema` of `BucketedWriteWithoutHiveSupportSuite`.
    - 
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/89507/testReport/
    - 
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/89522/testReport/
    
    
    ```
    [info] - write bucketed data *** FAILED *** (4 seconds, 698 milliseconds)
    [info]   org.apache.spark.SparkException: Job aborted due to stage failure: 
Task 0 in stage 84.0 failed 1 times, most recent failure: Lost task 0.0 in 
stage 84.0 (TID 86, localhost, executor driver): 
java.lang.IllegalStateException: LiveListenerBus is stopped.
    [info]      at 
org.apache.spark.scheduler.LiveListenerBus.addToQueue(LiveListenerBus.scala:97)
    [info]      at 
org.apache.spark.scheduler.LiveListenerBus.addToStatusQueue(LiveListenerBus.scala:80)
    [info]      at 
org.apache.spark.sql.internal.SharedState.<init>(SharedState.scala:93)
    [info]      at 
org.apache.spark.sql.SparkSession$$anonfun$sharedState$1.apply(SparkSession.scala:117)
    [info]      at 
org.apache.spark.sql.SparkSession$$anonfun$sharedState$1.apply(SparkSession.scala:117)
    [info]      at scala.Option.getOrElse(Option.scala:121)
    [info]      at 
org.apache.spark.sql.SparkSession.sharedState$lzycompute(SparkSession.scala:117)
    [info]      at 
org.apache.spark.sql.SparkSession.sharedState(SparkSession.scala:116)
    [info]      at 
org.apache.spark.sql.internal.BaseSessionStateBuilder.build(BaseSessionStateBuilder.scala:286)
    [info]      at 
org.apache.spark.sql.test.TestSparkSession.sessionState$lzycompute(TestSQLContext.scala:42)
    [info]      at 
org.apache.spark.sql.test.TestSparkSession.sessionState(TestSQLContext.scala:41)
    [info]      at 
org.apache.spark.sql.SparkSession$$anonfun$1$$anonfun$apply$1.apply(SparkSession.scala:92)
    [info]      at 
org.apache.spark.sql.SparkSession$$anonfun$1$$anonfun$apply$1.apply(SparkSession.scala:92)
    [info]      at scala.Option.map(Option.scala:146)
    [info]      at 
org.apache.spark.sql.SparkSession$$anonfun$1.apply(SparkSession.scala:92)
    [info]      at 
org.apache.spark.sql.SparkSession$$anonfun$1.apply(SparkSession.scala:91)
    [info]      at org.apache.spark.sql.internal.SQLConf$.get(SQLConf.scala:110)
    [info]      at 
org.apache.spark.sql.types.DataType.sameType(DataType.scala:84)
    [info]      at 
org.apache.spark.sql.catalyst.analysis.TypeCoercion$$anonfun$1.apply(TypeCoercion.scala:105)
    [info]      at 
org.apache.spark.sql.catalyst.analysis.TypeCoercion$$anonfun$1.apply(TypeCoercion.scala:86)
    [info]      at 
org.apache.spark.sql.execution.datasources.json.JsonInferSchema$.compatibleType(JsonInferSchema.scala:271)
    [info]      at 
org.apache.spark.sql.execution.datasources.json.JsonInferSchema$$anonfun$org$apache$spark$sql$execution$datasources$json$JsonInferSchema$$compatibleRootType$1.apply(JsonInferSchema.scala:262)
    [info]      at 
    ```
    
    I compared with `branch-2.3` itself. Unfortunately, recent`branch-2.3` 
itself is unstable. There is no success during last 18 runs for SBT builds.
    
    - 
https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.3-test-sbt-hadoop-2.6/
    - 
https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.3-test-sbt-hadoop-2.7/


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