Shuffle is also working from its own subpackage.

conf/java-opts

conf/log4j.properties

conf/spark-env.sh

core/src/main/scala/spark/Executor.scala

core/src/main/scala/spark/RDD.scala

core/src/main/scala/spark/SparkContext.scala

core/src/main/scala/spark/broadcast/Broadcast.scala

.../src/main/scala/spark/shuffle/BasicLocalFileShuffle.scala

...n/scala/spark/shuffle/CustomBlockedLocalFileShuffle.scala

.../scala/spark/shuffle/CustomParallelLocalFileShuffle.scala

core/src/main/scala/spark/shuffle/DfsShuffle.scala

...in/scala/spark/shuffle/HttpParallelLocalFileShuffle.scala

core/src/main/scala/spark/shuffle/Shuffle.scala