It looks like you're making the StreamingContext and SparkContext
separately from the same conf. Instead, how about passing the
SparkContext to the StreamingContext constructor? it seems like better
practice and is a guess at the problem cause.
On Tue, Oct 14, 2014 at 9:13 PM, SK <skrishna...@gmail.com> wrote:
> Hi,
>
> I am trying to implement simple sentiment analysis of Twitter streams in
> Spark/Scala. I am getting an exception and it appears when I combine
> SparkContext with StreamingContext in the same program. When I read the
> positive and negative words using only SparkContext.textFile (without
> creating a StreamingContext) and analyze static text files, the program
> works. Likewise, when I just create the twitter stream using
> StreamingContext (and dont create a SparkContext to create the vocabulary),
> the program works. The exception seems to be appearing when I combine both
> SparkContext and StreamingContext in the same program and I am not sure if
> we are not allowed to have both simultaneously. All the examples in the
> streaming module contain only the StreamingContext. The error transcript and
> my code appear below. I would appreciate your guidance in fixing this error
> and the right way to read static files and streams in the same program or
> any pointers to relevant examples.
> Thanks.
>
>
> ----------------------Error transcript -----------------------------
> Lost task 0.0 in stage 2.0 (TID 70, mesos4-dev.sccps.net):
> java.io.IOException: unexpected exception type
>
> java.io.ObjectStreamClass.throwMiscException(ObjectStreamClass.java:1538)
>
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1025)
>
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893)
>
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
>
> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
>
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
>
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
> java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
>
> org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:62)
>
> org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:87)
>
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:159)
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> java.lang.Thread.run(Thread.java:745)
> ------------------------------ My code below ------------------------------
> object TweetSentiment {
> def main(args: Array[String]) {
>
>
> val filters = args
> val sparkConf = new SparkConf().setAppName("TweetSentiment")
> val sc = new SparkContext(sparkConf)
>
> // get the list of positive words
> val pos_list = sc.textFile("positive-words.txt")
> .filter(line => !line.isEmpty())
> .collect()
> .toSet
>
> // get the list of negative words
> val neg_list = sc.textFile("negative-words.txt")
> .filter(line => !line.isEmpty())
> .collect()
> .toSet
>
> // create twitter stream
> val ssc = new StreamingContext(sparkConf, Seconds(60))
> val stream = TwitterUtils.createStream(ssc, None, filters)
> val tweets = stream.map(r => r.getText)
> tweets.print() // print tweet text
>
> ssc.start()
> ssc.awaitTermination()
> sc.stop() // I tried commenting this, but the exception still appeared.
> }
>
>
>
>
>
>
> --
> View this message in context:
> http://apache-spark-user-list.1001560.n3.nabble.com/Spark-Streaming-Sentiment-Analysis-of-Twitter-streams-tp16410.html
> Sent from the Apache Spark User List mailing list archive at Nabble.com.
>
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