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From Naveen Kumar Pokala <npok...@spcapitaliq.com>
Subject RE: Null pointer exception with larger datasets
Date Tue, 18 Nov 2014 09:09:47 GMT
Thanks Akhil.

-Naveen.


From: Akhil Das [mailto:akhil@sigmoidanalytics.com]
Sent: Tuesday, November 18, 2014 1:19 PM
To: Naveen Kumar Pokala
Cc: user@spark.apache.org
Subject: Re: Null pointer exception with larger datasets

Make sure your list is not null, if that is null then its more like doing:

JavaRDD<Student> distData = sc.parallelize(null)

distData.foreach(println)


Thanks
Best Regards

On Tue, Nov 18, 2014 at 12:07 PM, Naveen Kumar Pokala <npokala@spcapitaliq.com<mailto:npokala@spcapitaliq.com>>
wrote:
Hi,

I am having list Students and size is one Lakh and I am trying to save the file. It is throwing
null pointer exception.

JavaRDD<Student> distData = sc.parallelize(list);

distData.saveAsTextFile("hdfs://master/data/spark/instruments.txt");


14/11/18 01:33:21 WARN scheduler.TaskSetManager: Lost task 5.0 in stage 0.0 (TID 5, master):
java.lang.NullPointerException:
        org.apache.spark.rdd.RDD$$anonfun$saveAsTextFile$1.apply(RDD.scala:1158)
        org.apache.spark.rdd.RDD$$anonfun$saveAsTextFile$1.apply(RDD.scala:1158)
        scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
        org.apache.spark.rdd.PairRDDFunctions$$anonfun$13.apply(PairRDDFunctions.scala:984)
        org.apache.spark.rdd.PairRDDFunctions$$anonfun$13.apply(PairRDDFunctions.scala:974)
        org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:62)
        org.apache.spark.scheduler.Task.run(Task.scala:54)
        org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:177)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        java.lang.Thread.run(Thread.java:745)


How to handle this?

-Naveen

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