Github user taoli91 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12696#discussion_r61046274
  
    --- Diff: core/src/test/scala/org/apache/spark/storage/DiskStoreSuite.scala 
---
    @@ -22,10 +22,12 @@ import java.util.Arrays
     
     import org.apache.spark.{SparkConf, SparkFunSuite}
     import org.apache.spark.util.io.ChunkedByteBuffer
    +import org.apache.spark.util.Utils
     
     class DiskStoreSuite extends SparkFunSuite {
     
       test("reads of memory-mapped and non memory-mapped files are 
equivalent") {
    +    assume(!Utils.isWindows)
    --- End diff --
    
    It will cause error when we tried to re-open the filestore and the 
memory-mapped byte buffer to the file has not been GC. 
    
    Ref: http://bugs.java.com/bugdatabase/view_bug.do?bug_id=4724038
    
http://stackoverflow.com/questions/3602783/file-access-synchronized-on-java-object


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