Hi
I am new to Spark Streaming and writing a code for twitter connector. when i
run this code more than one time, it gives the following exception. I have
to create a new hdfs directory for checkpointing each time to make it run
successfully and moreover it doesn't get stopped.
ERROR StreamingContext: Error starting the context, marking it as stopped
org.apache.spark.SparkException:
org.apache.spark.streaming.dstream.WindowedDStream@532d0784 has not been
initialized
at
org.apache.spark.streaming.dstream.DStream.isTimeValid(DStream.scala:321)
at
org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:342)
at
org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:342)
at scala.Option.orElse(Option.scala:257)
at
org.apache.spark.streaming.dstream.DStream.getOrCompute(DStream.scala:339)
at
org.apache.spark.streaming.dstream.ForEachDStream.generateJob(ForEachDStream.scala:38)
at
org.apache.spark.streaming.DStreamGraph$$anonfun$1.apply(DStreamGraph.scala:120)
at
org.apache.spark.streaming.DStreamGraph$$anonfun$1.apply(DStreamGraph.scala:120)
at
scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
at
scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:251)
at
scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
at
scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:251)
at scala.collection.AbstractTraversable.flatMap(Traversable.scala:105)
at
org.apache.spark.streaming.DStreamGraph.generateJobs(DStreamGraph.scala:120)
at
org.apache.spark.streaming.scheduler.JobGenerator$$anonfun$restart$4.apply(JobGenerator.scala:227)
at
org.apache.spark.streaming.scheduler.JobGenerator$$anonfun$restart$4.apply(JobGenerator.scala:222)
at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:108)
at
org.apache.spark.streaming.scheduler.JobGenerator.restart(JobGenerator.scala:222)
at
org.apache.spark.streaming.scheduler.JobGenerator.start(JobGenerator.scala:92)
at
org.apache.spark.streaming.scheduler.JobScheduler.start(JobScheduler.scala:73)
at
org.apache.spark.streaming.StreamingContext.liftedTree1$1(StreamingContext.scala:588)
at
org.apache.spark.streaming.StreamingContext.start(StreamingContext.scala:586)
at twitter.streamingSpark$.twitterConnector(App.scala:38)
at twitter.streamingSpark$.main(App.scala:26)
at twitter.streamingSpark.main(App.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:664)
at
org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:169)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:192)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:111)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
The relavent code is
def twitterConnector() :Unit =
{
val atwitter=managingCredentials()
val ssc=StreamingContext.getOrCreate(hdfsDirectory,()= {
managingContext() })
fetchTweets(ssc, atwitter )
ssc.start() // Start the computation
ssc.awaitTermination()
}
def managingContext():StreamingContext =
{
//making spark context
val conf = new
SparkConf().setMaster(local[*]).setAppName(twitterConnector)
val ssc = new StreamingContext(conf, Seconds(1))
val sqlContext = new org.apache.spark.sql.SQLContext(ssc.sparkContext)
import sqlContext.implicits._
//checkpointing
ssc.checkpoint(hdfsDirectory)
ssc
}
def fetchTweets (ssc : StreamingContext , atwitter :
Option[twitter4j.auth.Authorization]) : Unit = {
val tweets
=TwitterUtils.createStream(ssc,atwitter,Nil,StorageLevel.MEMORY_AND_DISK_2)
val twt = tweets.window(Seconds(10),Seconds(10))
//checkpoint duration
/twt.checkpoint(new Duration(1000))
//processing
case class Tweet(createdAt:Long, text:String)
twt.map(status=
Tweet(status.getCreatedAt().getTime()/1000, status.getText())
)
twt.print()
}
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