In my opinion，"Append to a file" maybe is not good idea.
By using `MultipleTextOutputFormat`， you can append all values for a given
key to a directory
for example：
class RDDMultipleTextOutputFormat extends MultipleTextOutputFormat[Any,
Any] {
override def generateFileNameForKeyValue(key: Any, value: Any, name:
String): String =
key.asInstanceOf[String] + "/" + System.currentTimeMillis() //may
by you can use stream time
override def generateActualKey(key: Any, value: Any):Any ={
return null
}
}
val sc = new SparkContext(new
SparkConf().set("spark.hadoop.validateOutputSpecs", "false"))
sc.parallelize(Array("1","2","3"),3)
.map(a=>(a,a))
.saveAsHadoopFile("/Users/tmp", classOf[String], classOf[String],
classOf[RDDMultipleTextOutputFormat])
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