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https://issues.apache.org/jira/browse/SPARK-23390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-23390.
-----------------------------
       Resolution: Fixed
         Assignee: Wenchen Fan
    Fix Version/s: 2.3.0

> Flaky Test Suite: FileBasedDataSourceSuite in Spark 2.3/hadoop 2.7
> ------------------------------------------------------------------
>
>                 Key: SPARK-23390
>                 URL: https://issues.apache.org/jira/browse/SPARK-23390
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Sameer Agarwal
>            Assignee: Wenchen Fan
>            Priority: Major
>             Fix For: 2.3.0
>
>
> We're seeing multiple failures in {{FileBasedDataSourceSuite}} in 
> {{spark-branch-2.3-test-sbt-hadoop-2.7}}:
> {code}
> org.scalatest.exceptions.TestFailedDueToTimeoutException: The code passed to 
> eventually never returned normally. Attempted 15 times over 
> 10.012158059999999 seconds. Last failure message: There are 1 possibly leaked 
> file streams..
> {code}
> Here's the full history: 
> https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.3-test-sbt-hadoop-2.7/189/testReport/org.apache.spark.sql/FileBasedDataSourceSuite/history/
> From a very quick look, these failures seem to be correlated with 
> https://github.com/apache/spark/pull/20479 (cc [~dongjoon]) as evident from 
> the following stack trace (full logs 
> [here|https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.3-test-sbt-hadoop-2.7/189/console]):
>  
> {code}
> [info] - Enabling/disabling ignoreMissingFiles using orc (648 milliseconds)
> 15:55:58.673 WARN org.apache.spark.scheduler.TaskSetManager: Lost task 0.0 in 
> stage 61.0 (TID 85, localhost, executor driver): TaskKilled (Stage cancelled)
> 15:55:58.674 WARN org.apache.spark.DebugFilesystem: Leaked filesystem 
> connection created at:
> java.lang.Throwable
>       at 
> org.apache.spark.DebugFilesystem$.addOpenStream(DebugFilesystem.scala:36)
>       at org.apache.spark.DebugFilesystem.open(DebugFilesystem.scala:70)
>       at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:769)
>       at 
> org.apache.orc.impl.RecordReaderUtils$DefaultDataReader.open(RecordReaderUtils.java:173)
>       at 
> org.apache.orc.impl.RecordReaderImpl.<init>(RecordReaderImpl.java:254)
>       at org.apache.orc.impl.ReaderImpl.rows(ReaderImpl.java:633)
>       at 
> org.apache.spark.sql.execution.datasources.orc.OrcColumnarBatchReader.initialize(OrcColumnarBatchReader.java:138)
> {code}
> Also, while this might be just a false correlation but the frequency of these 
> test failures have increased considerably in 
> https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.3-test-sbt-hadoop-2.7/
>  after https://github.com/apache/spark/pull/20562 (cc 
> [~feng...@databricks.com]) was merged.



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