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

    https://github.com/apache/spark/pull/16499#discussion_r95066452
  
    --- Diff: 
core/src/test/scala/org/apache/spark/storage/BlockManagerReplicationSuite.scala 
---
    @@ -375,7 +375,8 @@ class BlockManagerReplicationSuite extends SparkFunSuite
           // Put the block into one of the stores
           val blockId = new TestBlockId(
             "block-with-" + storageLevel.description.replace(" ", 
"-").toLowerCase)
    -      stores(0).putSingle(blockId, new Array[Byte](blockSize), 
storageLevel)
    +      val testValue = Array.fill[Byte](blockSize)(1)
    --- End diff --
    
    Using an array of 1s instead of an array of 0s is my silly, paranoid, OCD 
way of adding a little extra entropy to the test. I think the chance that this 
change in test value will actually affect the outcome of this test is about 0%. 
I will revert to the original test value on request.


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