Hi, All,
Although there are lots of discussions related to logging in this news
group, I did not find an answer to my specific question so I am posting mine
with the hope that this will not cause a duplicated question.
Here is my simplified Java testing Spark app:
public class SparkJobEntry {
public static void main(String[] args) {
// Following line is in stdout from JobTracker UI
System.out.println("argc=" + args.length);
SparkConf conf = new SparkConf().setAppName("TestSparkApp");
JavaSparkContext sc = new JavaSparkContext(conf);
JavaRDD<String> fileRDD = sc.textFile(args[0]);
fileRDD.mapToPair(new PairFunction<String, String, String>() {
private static final long serialVersionUID = 1L;
@Override
public Tuple2<String, String> call(String input) throws
Exception {
// Following line is not in stdout from
JobTracker UI
System.out.println("This line should be printed
in stdout");
// Other code removed from here to make things
simple
return new Tuple2<String, String>("1", "Testing
data");
}}).saveAsTextFile(args[0] + ".results");
}
}
What I expected from JobTracker UI is to see both stdout lines: first line
is "argc=2" and second line is "This line should be printed in stdout". But
I only see the first line which is outside of the 'mapToPair'. I actually
have verified my 'mapToPair' is called and the statements after the second
logging line were executed. The only issue for me is why the second logging
is not in JobTracker UI.
Appreciate your help.
Thanks
John
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