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(ke
for rdd, you can use `saveAsHadoopFile` with a Custom `MultipleOutputFormat`
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