Hi, for Flink the runner can internally either translate to a batch job or a streaming job. Unbounded sources are not supported when running in batch mode so you have to somehow specify that you want to have streaming mode. StreamingOptions has method setStreaming, maybe you can specify “—streaming true” on the command line to set that flag.
Cheers, Aljoscha > On 21 Mar 2016, at 23:39, William McCarthy <[email protected]> wrote: > > I’ve attempted to run the TopHashtagsExample again, using both > ‘FlinkPipelineRunner’ and it's fully qualified name. Both bomb out, though > the latter gets further. I hope this helps, here is the output of both: > > $ flink run -c > com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample > target/beam-1.0-SNAPSHOT.jar --runner=FlinkPipelineRunner > --bootstrapServers=cl-pu4p:9092 --topics=test_in --outputTopic=test_out > > ------------------------------------------------------------ > The program finished with the following exception: > > org.apache.flink.client.program.ProgramInvocationException: The main method > caused an error. > at > org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:520) > at > org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:403) > at org.apache.flink.client.program.Client.runBlocking(Client.java:248) > at > org.apache.flink.client.CliFrontend.executeProgramBlocking(CliFrontend.java:866) > at org.apache.flink.client.CliFrontend.run(CliFrontend.java:333) > at > org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1189) > at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1239) > Caused by: java.lang.IllegalArgumentException: Unknown 'runner' specified > 'FlinkPipelineRunner', supported pipeline runners > [BlockingDataflowPipelineRunner, DataflowPipelineRunner, DirectPipelineRunner] > at > com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory.parseObjects(PipelineOptionsFactory.java:1486) > at > com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory.access$400(PipelineOptionsFactory.java:101) > at > com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory$Builder.as(PipelineOptionsFactory.java:286) > at > com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample.main(TopHashtagsExample.java:117) > 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:498) > at > org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:505) > ... 6 more > Caused by: java.lang.ClassNotFoundException: FlinkPipelineRunner > at java.net.URLClassLoader.findClass(URLClassLoader.java:381) > at java.lang.ClassLoader.loadClass(ClassLoader.java:424) > at java.lang.ClassLoader.loadClass(ClassLoader.java:357) > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Class.java:264) > at > com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory.parseObjects(PipelineOptionsFactory.java:1473) > ... 14 more > > > $ flink run -c > com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample > target/beam-1.0-SNAPSHOT.jar > --runner=org.apache.beam.runners.flink.FlinkPipelineRunner > --bootstrapServers=cl-pu4p:9092 --topics=test_in --outputTopic=test_out > > ------------------------------------------------------------ > The program finished with the following exception: > > org.apache.flink.client.program.ProgramInvocationException: The main method > caused an error. > at > org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:520) > at > org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:403) > at org.apache.flink.client.program.Client.runBlocking(Client.java:248) > at > org.apache.flink.client.CliFrontend.executeProgramBlocking(CliFrontend.java:866) > at org.apache.flink.client.CliFrontend.run(CliFrontend.java:333) > at > org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1189) > at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1239) > Caused by: java.lang.UnsupportedOperationException: The transform > Read(UnboundedKafkaSource) is currently not supported. > at > org.apache.beam.runners.flink.translation.FlinkBatchPipelineTranslator.visitTransform(FlinkBatchPipelineTranslator.java:111) > at > com.google.cloud.dataflow.sdk.runners.TransformTreeNode.visit(TransformTreeNode.java:219) > at > com.google.cloud.dataflow.sdk.runners.TransformTreeNode.visit(TransformTreeNode.java:215) > at > com.google.cloud.dataflow.sdk.runners.TransformTreeNode.visit(TransformTreeNode.java:215) > at > com.google.cloud.dataflow.sdk.runners.TransformHierarchy.visit(TransformHierarchy.java:102) > at > com.google.cloud.dataflow.sdk.Pipeline.traverseTopologically(Pipeline.java:259) > at > org.apache.beam.runners.flink.translation.FlinkPipelineTranslator.translate(FlinkPipelineTranslator.java:34) > at > org.apache.beam.runners.flink.FlinkPipelineExecutionEnvironment.translate(FlinkPipelineExecutionEnvironment.java:130) > at > org.apache.beam.runners.flink.FlinkPipelineRunner.run(FlinkPipelineRunner.java:109) > at > org.apache.beam.runners.flink.FlinkPipelineRunner.run(FlinkPipelineRunner.java:50) > at com.google.cloud.dataflow.sdk.Pipeline.run(Pipeline.java:180) > at > com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample.main(TopHashtagsExample.java:140) > 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:498) > at > org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:505) > ... 6 more > > >> On Mar 21, 2016, at 12:23 PM, Raghu Angadi <[email protected]> wrote: >> >> Thanks Max. >> >> Bill McCarthy, >> I know you are unblocked and KafkaWriter is good enough. Please try KafkaIO >> source from my branch with Flink runner if you get a chance. >> >> thanks, >> Raghu. >> >> On Mon, Mar 21, 2016 at 6:54 AM, Jean-Baptiste Onofré <[email protected]> >> wrote: >> Thanks for the update Max ! >> >> Regards >> JB >> >> >> On 03/21/2016 02:39 PM, Maximilian Michels wrote: >> FYI: The Runner registration has been fixed. The Flink runner >> explicitly registers as of [1]. Also, the SDK tries to look up the >> PipelineRunner class in case it has not been registered [2]. >> >> [1] https://github.com/apache/incubator-beam/pull/40 >> [2] https://github.com/apache/incubator-beam/pull/61 >> >> On Sat, Mar 19, 2016 at 6:43 PM, Maximilian Michels <[email protected]> wrote: >> Great to see such a lively discussion here. >> >> I think we'll support sinks through the Write interface (like in >> batched execution) and also have a dedicated wrapper for the Flink >> sinks. This is a very pressing but easy to solve issue of the Flink >> runner. Expect it to be in next week. >> >> Also, the proper registration of the runner is about to to be merged. >> We just need an ok from the contributor to merge the changes. >> >> Best, >> Max >> >> On Sat, Mar 19, 2016 at 12:42 AM, Dan Halperin <[email protected]> wrote: >> Thanks Bill! >> >> Filed https://issues.apache.org/jira/browse/BEAM-136, but I'm glad it's not >> blocking you! >> >> On Fri, Mar 18, 2016 at 4:04 PM, William McCarthy >> <[email protected]> wrote: >> >> I tried that, but still no dice: Just to be clear, it’s not a blocker for >> me, given that I have my example running, but for your information the >> exception is below. >> >> I’ll watch the commit log on the beam incubator and look forward to >> deleting my copy of Raghu’s contributions when they’re merger to master. >> >> Thanks again for everyone’s help, >> >> Bill >> >> >> Command followed by exception: >> >> $ flink run -c >> com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample >> target/beam-1.0-SNAPSHOT.jar >> --runner=org.apache.beam.runners.flink.FlinkPipelineRunner >> --bootstrapServers=cl-pu4p:9092 --topics=test_in --outputTopic=test_out >> >> ------------------------------------------------------------ >> The program finished with the following exception: >> >> org.apache.flink.client.program.ProgramInvocationException: The main >> method caused an error. >> at >> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:520) >> at >> org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:403) >> at org.apache.flink.client.program.Client.runBlocking(Client.java:248) >> at >> org.apache.flink.client.CliFrontend.executeProgramBlocking(CliFrontend.java:866) >> at org.apache.flink.client.CliFrontend.run(CliFrontend.java:333) >> at >> org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1189) >> at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1239) >> Caused by: java.lang.IllegalArgumentException: Unknown 'runner' specified >> 'org.apache.beam.runners.flink.FlinkPipelineRunner', supported pipeline >> runners [BlockingDataflowPipelineRunner, DataflowPipelineRunner, >> DirectPipelineRunner] >> at >> com.google.cloud.dataflow.sdk.repackaged.com.google.common.base.Preconditions.checkArgument(Preconditions.java:146) >> at >> com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory.parseObjects(PipelineOptionsFactory.java:1445) >> at >> com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory.access$400(PipelineOptionsFactory.java:99) >> at >> com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory$Builder.as(PipelineOptionsFactory.java:284) >> at >> com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample.main(TopHashtagsExample.java:117) >> 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:498) >> at >> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:505) >> ... 6 more >> >> On Mar 18, 2016, at 5:35 PM, Thomas Groh <[email protected]> wrote: >> >> I don't believe the FlinkPipelineRunner is registered the same way the >> Dataflow & Direct Pipeline runners are registered; using >> org.apache.beam.runners.flink.FlinkPipelineRunner should work >> >> On Fri, Mar 18, 2016 at 2:10 PM, William McCarthy >> <[email protected]> wrote: >> >> Thanks Dan, >> >> I tried that, but getting the below. Note that the jar contains the >> FlinkPipelineRunner. >> >> >> >> % jar -tf target/beam-1.0-SNAPSHOT.jar | grep FlinkPipeline >> org/apache/beam/runners/flink/FlinkPipelineRunner.class >> org/apache/beam/runners/flink/FlinkPipelineExecutionEnvironment.class >> org/apache/beam/runners/flink/FlinkPipelineOptions.class >> org/apache/beam/runners/flink/translation/FlinkPipelineTranslator.class >> >> % flink run -c >> com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample >> target/beam-1.0-SNAPSHOT.jar --runner=FlinkPipelineRunner >> --bootstrapServers=cl-pu4p:9092 --topics=test_in --outputTopic=test_out >> >> ------------------------------------------------------------ >> The program finished with the following exception: >> >> org.apache.flink.client.program.ProgramInvocationException: The main >> method caused an error. >> at >> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:520) >> at >> org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:403) >> at org.apache.flink.client.program.Client.runBlocking(Client.java:248) >> at >> org.apache.flink.client.CliFrontend.executeProgramBlocking(CliFrontend.java:866) >> at org.apache.flink.client.CliFrontend.run(CliFrontend.java:333) >> at >> org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1189) >> at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1239) >> Caused by: java.lang.IllegalArgumentException: Unknown 'runner' specified >> 'FlinkPipelineRunner', supported pipeline runners >> [BlockingDataflowPipelineRunner, DataflowPipelineRunner, >> DirectPipelineRunner] >> at >> com.google.cloud.dataflow.sdk.repackaged.com.google.common.base.Preconditions.checkArgument(Preconditions.java:146) >> at >> com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory.parseObjects(PipelineOptionsFactory.java:1445) >> at >> com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory.access$400(PipelineOptionsFactory.java:99) >> at >> com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory$Builder.as(PipelineOptionsFactory.java:284) >> at >> com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample.main(TopHashtagsExample.java:117) >> 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:498) >> at >> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:505) >> ... 6 more >> >> >> >> On Mar 18, 2016, at 5:00 PM, Dan Halperin <[email protected]> wrote: >> >> Thanks for catching that, Aljoscha! >> >> Note that the Flink runner should be available via a command-line option >> as well: --runner=FlinkPipelineRunner. >> >> The list of valid values for that flag is computed by walking the >> classpath at runtime, so as long as the Flink jar is present it'll work. >> >> On Fri, Mar 18, 2016 at 1:21 PM, Aljoscha Krettek <[email protected]> >> wrote: >> >> Hi, >> looks like the example is being executed with the DirectPipelineRunner >> which does not seem to be able to cope with UnboundedSource. You need to set >> the runner to the FlinkRunner in the example code as described here: >> https://github.com/apache/incubator-beam/tree/master/runners/flink#executing-an-example >> >> The Flink runner should be able to deal with UnboundedSource but has the >> limitation that sources are always parallelism=1 (this is being worked on, >> however). >> >> Cheers, >> Aljoscha >> On 18 Mar 2016, at 20:56, Dan Halperin <[email protected]> wrote: >> >> Looks like the Flink runner may not yet support arbitrary code written >> with the UnboundedSource API. That is, it looks like the Flink runner >> expects the sources to get translated away. >> >> Max? >> >> Dan >> >> On Fri, Mar 18, 2016 at 12:20 PM, William McCarthy >> <[email protected]> wrote: >> Thanks Raghu, >> >> When I try to run it on flink using the incubator-beam code, i.e. >> >> flink run -c >> com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample >> target/beam-1.0-SNAPSHOT.jar --bootstrapServers=cl-pu4p:9092 >> --topics=test_in --outputTopic=test_out >> >> I get this: >> >> org.apache.flink.client.program.ProgramInvocationException: The main >> method caused an error. >> at >> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:520) >> at >> org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:403) >> at >> org.apache.flink.client.program.Client.runBlocking(Client.java:248) >> at >> org.apache.flink.client.CliFrontend.executeProgramBlocking(CliFrontend.java:866) >> at org.apache.flink.client.CliFrontend.run(CliFrontend.java:333) >> at >> org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1189) >> at >> org.apache.flink.client.CliFrontend.main(CliFrontend.java:1239) >> Caused by: java.lang.IllegalStateException: no evaluator registered >> for Read(UnboundedKafkaSource) >> at >> com.google.cloud.dataflow.sdk.runners.DirectPipelineRunner$Evaluator.visitTransform(DirectPipelineRunner.java:852) >> at >> com.google.cloud.dataflow.sdk.runners.TransformTreeNode.visit(TransformTreeNode.java:219) >> at >> com.google.cloud.dataflow.sdk.runners.TransformTreeNode.visit(TransformTreeNode.java:215) >> at >> com.google.cloud.dataflow.sdk.runners.TransformTreeNode.visit(TransformTreeNode.java:215) >> at >> com.google.cloud.dataflow.sdk.runners.TransformHierarchy.visit(TransformHierarchy.java:102) >> at >> com.google.cloud.dataflow.sdk.Pipeline.traverseTopologically(Pipeline.java:259) >> at >> com.google.cloud.dataflow.sdk.runners.DirectPipelineRunner$Evaluator.run(DirectPipelineRunner.java:814) >> at >> com.google.cloud.dataflow.sdk.runners.DirectPipelineRunner.run(DirectPipelineRunner.java:526) >> at >> com.google.cloud.dataflow.sdk.runners.DirectPipelineRunner.run(DirectPipelineRunner.java:96) >> at com.google.cloud.dataflow.sdk.Pipeline.run(Pipeline.java:180) >> at >> com.google.cloud.dataflow.contrib.kafka.examples.TopHashtagsExample.main(TopHashtagsExample.java:140) >> 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:498) >> at >> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:505) >> ... 6 more >> >> Any ideas? >> >> Bill >> >> On Mar 18, 2016, at 2:47 PM, Raghu Angadi <[email protected]> wrote: >> >> Thanks for trying it. >> >> I fixed the CheckStyle error (not sure why my build is not failing). >> Let me know if you see any issues running with Beam. I haven't tried it. I >> should. In fact Daniel Halperin says my patch should be against Beam.. >> >> Raghu. >> >> On Fri, Mar 18, 2016 at 11:22 AM, William McCarthy >> <[email protected]> wrote: >> Thanks JB, Emanuele, Kostas & Raghu, especially Kostas and Raghu for >> pointing me to working code. >> >> I’m in the middle of a hack day at the moment, so the speed of your >> responses has been very welcome. >> >> In the first instance, I’ll try using your changes, Raghu. I’ve >> cloned your repo, switched to the kafka branch and built both contrib/kafka >> and contrib/examples/kafka. The contrib/kafka initially failed with a >> CheckStyle error >> (/Users/bill/dev/DataflowJavaSDK/contrib/kafka/src/main/java/com/google/cloud/dataflow/contrib/kafka/KafkaIO.java:683:12: >> 'private' modifier out of order with the JLS suggestions)… I’ve fixed that >> in my local clone and now it’s building fine. I hope to be able to run your >> contrib unchanged on top of the incubator-beam codebase, which will be what >> I attempt to do now. >> >> Thanks again to all, for your swift help. >> >> Bill >> >> On Mar 18, 2016, at 12:55 PM, Raghu Angadi <[email protected]> >> wrote: >> >> Hi Bill, >> >> We have fairly well tested patch for KafkaIO (pr #121). It will be >> merged soon. The example there keeps track of top hashtags in 10 minute >> sliding window and writes the results to another Kafka topic. Please try it >> if you can. It is well tested on Google Cloud Dataflow. I have not run it >> using Flink runner. >> >> Raghu. >> >> On Fri, Mar 18, 2016 at 9:46 AM, Kostas Kloudas >> <[email protected]> wrote: >> Hello Bill, >> >> This is a known limitation of the Flink Runner. >> There is a JIRA issue for that >> https://issues.apache.org/jira/browse/BEAM-127 >> >> A wrapper for Flink sinks will come soon and as Beam evolves, >> a more Beam-y solution will come as well. >> >> Kostas >> On Mar 18, 2016, at 5:23 PM, William McCarthy >> <[email protected]> wrote: >> >> Hi, >> >> I’m trying to write a proof-of-concept which takes messages from >> Kafka, transforms them using Beam on Flink, then pushes the results onto a >> different Kafka topic. >> >> I’ve used the KafkaWindowedWordCountExample as a starting point, >> and that’s doing the first part of what I want to do, but it outputs to text >> files as opposed to Kafka. FlinkKafkaProducer08 looks promising, but I can’t >> figure out how to plug it into the pipeline. I was thinking that it would be >> wrapped with an UnboundedFlinkSink, or some such, but that doesn’t seem to >> exist. >> >> Any advice or thoughts on what I’m trying to do? >> >> I’m running the latest incubator-beam (as of last night from >> Github), Flink 1.0.0 in cluster mode and Kafka 0.9.0.1, all on Google >> Compute Engine (Debian Jessie). >> >> Thanks, >> >> Bill McCarthy >> >> >> >> >> >> >> >> >> >> >> >> >> >> -- >> Jean-Baptiste Onofré >> [email protected] >> http://blog.nanthrax.net >> Talend - http://www.talend.com >> >
