单项选择题
A.groupByKeyB.sortByKeyC.joinD.repartition
A.RADB.RBDC.RCDD.RDD
A.saveAsTextFileB.saveAsOrcFileC.saveAsAvroFileD.saveAsParquetFile
A.saveAsTextFileB.saveAsSequenceFileC.S.aveAsObjectFileD.S.aveAsParquetFile
A.mapB.filterC.flatMapD.reduce
A.I.nput和OutputB.T.ransformation和ActionC.T.ransformation和OutputD.I.nput和Action
A.12B.14C.16D.18
A.4020B.4030C.4040D.4050
A.1B.2C.3D.服务器核心数
A.org.apache.spark.serializer.KryoSerializerB.org.apache.spark.serializer.JavaSerializerC.org.apache.spark.serializer.Lz4SerializerD.org.apache.spark.serializer.ScalaSerializer
A.spark.driver.extraJarPathB.spark.driver.extraClassPathC.spark.driver.extraJarDirectoryD.spark.driver.extraClassDirectory