How to check whether the RDD is empty or not

[diplomatic Guru]

Hello All,

I have a Spark Streaming job that should  do some action only if the RDD is
not empty. This can be done easily with the spark batch RDD as I could
.take(1) and check whether it is empty or  not. But this cannot been done
in Spark Streaming DStrem


JavaPairInputDStream<LongWritable, Text> input =
ssc.fileStream(iFolder, LongWritable.class,Text.class,
TextInputFormat.class);

 if(inputLines!=null){
//do some action if it is not empty
}

Any ideas please?