saving DF to HDFS in parquet format very slow in SparkSQL app

[luohui20001]

hi there:    I got a problem in saving a DF to HDFS as parquet format very 
slow. And I attached a pic which shows a lot of time is spent in getting 
result.the code is 
:streamingData.write.mode(SaveMode.Overwrite).parquet("/data/streamingData")
I don't quite understand why my app is so slow in getting the result. I tried 
to access my HDFS while the app is running slow , HDFS is ok.
Any idea will be appreciated.


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Thanks&Best regards!
San.Luo

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