Re: Does HadoopOutputFormat create MapReduce job internally?

Posted by Fabian Hueske-2 on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Does-HadoopOutputFormat-create-MapReduce-job-internally-tp27272p27292.html

Hi Morven,

You posted the same question a few days ago and it was also answered correctly. 

Please do not repost the same question again.

You can reply to the earlier thread if you have a follow up question.

To answer your question briefly:

No, Flink does not trigger a MapReduce job. 

The whole job is executed in Flink. 

Fabian 

morven huang <[hidden email]> schrieb am Sa., 13. Apr. 2019, 14:37:

Hi,

 

I’d like to sink my data into hdfs using SequenceFileAsBinaryOutputFormat with compression, and I find a way from the link https://ci.apache.org/projects/flink/flink-docs-stable/dev/batch/hadoop_compatibility.html, the code works, but I’m curious to know, since it creates a mapreduce Job instance here, would this Flink application creates and run a mapreduce underneath? If so, will it kill performance?

 

I tried to figure out by looking into log, but couldn’t get a clue, hope people could shed some light here. Thank you.

 

Job job = Job.getInstance();

HadoopOutputFormat<BytesWritable, BytesWritable> hadoopOF = new HadoopOutputFormat<BytesWritable, BytesWritable>(

                    new SequenceFileAsBinaryOutputFormat(), job);

 

hadoopOF.getConfiguration().set("mapreduce.output.fileoutputformat.compress", "true");

hadoopOF.getConfiguration().set("mapreduce.output.fileoutputformat.compress.type", CompressionType.BLOCK.toString());

TextOutputFormat.setOutputPath(job, new Path("hdfs://..."));

dataset.output(hadoopOF);

 

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