Hi Emre,
This is how you do that in scala:
val lines = ssc.fileStream[LongWritable, Text,
TextInputFormat]("/home/akhld/sigmoid", (t: Path) => true, true)
In java you can do something like:
jssc.ssc().<LongWritable, Text,
SequenceFileInputFormat>fileStream("/home/akhld/sigmoid", new
AbstractFunction1<Path, Object>() {
@Override
public Boolean apply(Path input) {
//file filtering logic here
return true;
}
}, true, ClassTag$.MODULE$.apply(LongWritable.class),
ClassTag$.MODULE$.apply(Text.class),
ClassTag$.MODULE$.apply(SequenceFileInputFormat.class));
Thanks
Best Regards
On Mon, Feb 2, 2015 at 6:34 PM, Emre Sevinc <[email protected]> wrote:
> Hello,
>
> I'm using Apache Spark Streaming 1.2.0 and trying to define a file filter
> for file names when creating an InputDStream
> <https://spark.apache.org/docs/1.2.0/api/java/org/apache/spark/streaming/dstream/InputDStream.html>
> by invoking the fileStream
> <https://spark.apache.org/docs/1.2.0/api/java/org/apache/spark/streaming/StreamingContext.html#fileStream%28java.lang.String,%20scala.Function1,%20boolean,%20scala.reflect.ClassTag,%20scala.reflect.ClassTag,%20scala.reflect.ClassTag%29>
> method. My code is working perfectly fine when I don't use a file filter,
> e.g. by invoking the other fileStream
> <https://spark.apache.org/docs/1.2.0/api/java/org/apache/spark/streaming/StreamingContext.html#fileStream%28java.lang.String,%20scala.reflect.ClassTag,%20scala.reflect.ClassTag,%20scala.reflect.ClassTag%29>
> method (described here
> <https://spark.apache.org/docs/1.2.0/api/java/org/apache/spark/streaming/StreamingContext.html#fileStream%28java.lang.String,%20scala.reflect.ClassTag,%20scala.reflect.ClassTag,%20scala.reflect.ClassTag%29>:
>
> https://spark.apache.org/docs/1.2.0/api/java/org/apache/spark/streaming/StreamingContext.html#fileStream%28java.lang.String,%20scala.reflect.ClassTag,%20scala.reflect.ClassTag,%20scala.reflect.ClassTag%29
> ).
>
> According to the documentation of *fileStream* method, I can pass it
>
> scala.Function1<org.apache.hadoop.fs.Path,Object> filter
>
> But so far, I could not create a fileFilter. My initial attempts have
> been
>
> 1- Tried to implement it as:
>
> Function1<Path, Object> fileFilter = new Function1<Path, Object>() {
> @Override
> public Object apply(Path v1) {
> return true;
> }
>
> @Override
> public <A> Function1<A, Object> compose(Function1<A, Path> g) {
> return Function1$class.compose(this, g);
> }
>
> @Override
> public <A> Function1<Path, A> andThen(Function1<Object, A> g) {
> return Function1$class.andThen(this, g);
> }
> };
>
> But apparently my implementation of andThen is wrong, and I couldn't
> understand how I should implement it. It complains that the anonymous
> function:
>
> is not abstract and does not override abstract method
> <A>andThen$mcVJ$sp(scala.Function1<scala.runtime.BoxedUnit,A>) in
> scala.Function1
>
> 2- Tried to implement it as:
>
> Function1<Path, Object> fileFilter = new AbstractFunction1<Path, Object>() {
> @Override
> public Object apply(Path v1) {
> return true;
> }
> };
>
> This one compiles, but when I run it I get an exception:
>
> 2015-02-02 13:42:50 ERROR OneForOneStrategy:66 - myModule$1
> java.io.NotSerializableException: myModule$1
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1378)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
> at
> java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:441)
> at
> org.apache.spark.streaming.DStreamGraph$$anonfun$writeObject$1.apply$mcV$sp(DStreamGraph.scala:169)
> at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:985)
> at
> org.apache.spark.streaming.DStreamGraph.writeObject(DStreamGraph.scala:164)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:483)
> at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
> at org.apache.spark.streaming.CheckpointWriter.write(Checkpoint.scala:184)
> at
> org.apache.spark.streaming.scheduler.JobGenerator.doCheckpoint(JobGenerator.scala:263)
> at
> org.apache.spark.streaming.scheduler.JobGenerator.org$apache$spark$streaming$scheduler$JobGenerator$$processEvent(JobGenerator.scala:167)
> at
> org.apache.spark.streaming.scheduler.JobGenerator$$anonfun$start$1$$anon$1$$anonfun$receive$1.applyOrElse(JobGenerator.scala:76)
> at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
> at
> org.apache.spark.streaming.scheduler.JobGenerator$$anonfun$start$1$$anon$1.aroundReceive(JobGenerator.scala:74)
> at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
> at akka.actor.ActorCell.invoke(ActorCell.scala:487)
> at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
> at akka.dispatch.Mailbox.run(Mailbox.scala:220)
> at
> akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
> at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
> at
> scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
> at
> scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
> at
> scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
>
>
> Any ideas how I can implement a *fileFilter* so that I can pass it fileStream
> method, so that I can make Spark Streaming process only the file name
> patterns I want?
>
>
> --
>
> Emre Sevinç
>
>
>
