Github user petermaxlee commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15166#discussion_r79730104
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamingQuerySuite.scala
 ---
    @@ -125,6 +125,30 @@ class StreamingQuerySuite extends StreamTest with 
BeforeAndAfter {
         )
       }
     
    +  testQuietly("StreamExecution metadata garbage collection") {
    +    val inputData = MemoryStream[Int]
    +    val mapped = inputData.toDS().map(6 / _)
    +
    +    // Run 3 batches, and then assert that only 1 metadata file is left at 
the end
    +    // since the first 2 should have been purged.
    +    testStream(mapped)(
    +      AddData(inputData, 1, 2),
    +      CheckAnswer(6, 3),
    +      AddData(inputData, 1, 2),
    +      CheckAnswer(6, 3, 6, 3),
    +      AddData(inputData, 4, 6),
    +      CheckAnswer(6, 3, 6, 3, 1, 1),
    +
    +      AssertOnQuery("metadata log should contain only one file") { q =>
    +        val metadataLogDir = new 
java.io.File(q.offsetLog.metadataPath.toString)
    +        val logFileNames = 
metadataLogDir.listFiles().toSeq.map(_.getName())
    +        val toTest = logFileNames.filter(! _.endsWith(".crc"))  // 
Workaround for SPARK-17475
    +        assert(toTest.size == 1 && toTest.head == "2")
    +        true
    --- End diff --
    
    It still fails. There was an assert there.


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