Re: can fileStream() or textFileStream() remember state?

[vasiliy <za...@gmail.com>]

When you get a stream from sc.fileStream() spark will process only files with
file timestamp > then current timestamp so all data from HDFS should not be
processed  again. You may have a another problem - spark will not process
files that moved to your HDFS folder between your application restarts. To
avoid this you should use the checkpoints as discribed here :
https://spark.apache.org/docs/latest/streaming-programming-guide.html#failure-of-the-driver-node


akso wrote
> When streaming from HDFS through eihter sc.fileStream() or
> sc.textFileStream(), how can state info be saved so that it won't process
> duplicate data.
> When app is stop and restart, all data from HDFS is processed again.





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