Make sure the broadcast variable works independent of the streaming
application. Then make sure it work without have
StreamingContext.getOrCreate(). That will disambiguate whether that error
is thrown when starting a new context, or when recovering a context from
checkpoint (as getOrCreate is supposed to do).
On Mon, Oct 5, 2015 at 9:23 AM, dpristin <dpris...@gmail.com> wrote:
> Hi,
>
> Can anyone point me out to what I'm doing wrong? I've implemented a very
> basic spark streaming app that uses a single broadcast variable. When it
> runs locally it produces a proper output (the array I broadcast). But when
> deployed on the cluster I get "broadcastVar is null". We use v 1.4.1. Here
> is the code:
>
> --- imports go here
>
> object BroadcastTest extends App {
> val logger = LoggerFactory.getLogger("OinkSparkMain")
> logger.info("OinkSparkMain - Setup Logger")
>
> // This is our custom context setup code; nothing fancy goes on here
> val config = Configuration(args)
> val ssc: StreamingContext =
> StreamingContext.getOrCreate(config.checkpointDirectory, () => {
> SparkStreamingContextFactory.Create(config, timeWindow = Seconds(10))})
>
>
> val kafkaStreamFactory = new KafkaStreamFactory(config, ssc)
> val messages = kafkaStreamFactory.Create
>
> // Grab the value data above kafka input dstream as a string
> val events = messages.map( s => s._2 )
>
> //Create a broadcast variable - straight from the dev guide
> val broadcastVar = ssc.sparkContext.broadcast(Array(1, 2, 3))
>
> //Try to print out the value of the broadcast var here
> val transformed = events.transform(rdd => {
> rdd.map(x => {
> if(broadcastVar == null) {
> println("broadcastVar is null")
> } else {
> println("broadcastVar value: " + broadcastVar.value.mkString("|"))
> }
> x
> })
> })
>
> transformed.foreachRDD(x => logger.info("Data: " +
> x.collect.mkString("|")))
>
> ssc.start()
> ssc.awaitTermination()
> }
>
> Any input is very much appreciated!
>
> Regards,
> Dmitry.
>
>
>
>
>
>
>
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