cloud-fan commented on issue #26611: [SPARK-29939][CORE] Add a conf for 
CompressionCodec for Ser/Deser of MapOutputStatus
URL: https://github.com/apache/spark/pull/26611#issuecomment-556912911
 
 
   can we follow
   ```
   private[spark] val EVENT_LOG_COMPRESSION_CODEC =
       ConfigBuilder("spark.eventLog.compression.codec")
         .doc("The codec used to compress event log. By default, Spark provides 
four codecs: " +
           "lz4, lzf, snappy, and zstd. You can also use fully qualified class 
names to specify " +
           "the codec. If this is not given, spark.io.compression.codec will be 
used.")
         .fallbackConf(IO_COMPRESSION_CODEC)
   ```
   to create a new config for map status? then we can set the default value 
correctly.

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