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

    https://github.com/apache/spark/pull/17024#discussion_r102420200
  
    --- Diff: 
core/src/main/scala/org/apache/spark/rdd/ReliableCheckpointRDD.scala ---
    @@ -169,14 +174,24 @@ private[spark] object ReliableCheckpointRDD extends 
Logging {
         val bufferSize = env.conf.getInt("spark.buffer.size", 65536)
     
         val fileOutputStream = if (blockSize < 0) {
    -      fs.create(tempOutputPath, false, bufferSize)
    +      val checkpointCodec = 
env.conf.get("spark.checkpoint.compress.codec", "none")
    +      val fileStream = fs.create(tempOutputPath, false, bufferSize)
    +      if 
(CompressionCodec.ALL_COMPRESSION_CODECS_SHORT.contains(checkpointCodec)) {
    +        val compressionCodec = CompressionCodec.createCodec(env.conf, 
checkpointCodec)
    +        logInfo(s"Compressing using $checkpointCodec.")
    +        compressionCodec.compressedOutputStream(fileStream)
    +      } else {
    +        fileStream
    +      }
         } else {
           // This is mainly for testing purpose
           fs.create(tempOutputPath, false, bufferSize,
             fs.getDefaultReplication(fs.getWorkingDirectory), blockSize)
         }
         val serializer = env.serializer.newInstance()
         val serializeStream = serializer.serializeStream(fileOutputStream)
    +    logInfo(s"Starting to write to checkpoint file $tempOutputPath.")
    --- End diff --
    
    This will make the logs verbose.
    If it does help with debugging, you could make it logTrace - or remove it 
entirely.


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