Thank you for your response! I have not tried the flink run app.jar route because the way the app is set up does not allow me to do it. Basically, the app is a web application which serves the UI and also submits a Flink job for running Cypher queries. It is a proof-of-concept app, but IMO, a very useful one.
Here's how you can reproduce: 1) git clone g...@github.com:kedarmhaswade/gradoop_demo.git (this is my fork of gradoop_demo) 2) cd gradoop_demo 3) git checkout dev => dev is the branch where my changes to make gradoop work with remote environment go. 4) mvn clean package => should bring the gradoop JARs that this app needs; these JARs should then be placed in <flink-install>/lib. 5) cp ~/.m2/repository/org/gradoop/gradoop-common/0.3.2/gradoop-common-0.3.2.jar <flink-install>/lib, cp ~/.m2/repository/org/gradoop/gradoop-flink/0.3.2/gradoop-flink-0.3.2.jar <flink-install>/lib, cp target/gradoop-demo-0.2.0.jar <flink-install>/lib. 6) start the local flink cluster (I have tried with latest (built-from-source) 1.6-SNAPSHOT, or 1.4) <flink-install>/bin/start-cluster.sh -- note the JM host and port 7) <gradoop-demo>/start.sh --jmhost <host> --jmport 6123 (adjust host and port per your cluster) => this is now configured to talk to the RemoteEnvironment at given JM host and port. 8) open a browser at: http://localhost:2342/gradoop/html/cypher.html 9) hit the query button => this would throw the exception 10) Ctrl C the process in 7 and just restart it as java -cp target/classes:target/gradoop-demo-shaded.jar org.gradoop.demo.server.Server => starts LocalEnvironment 11) do 9 again and see the results shown nicely in the browser. Here is the relevant code: 1) Choosing between <https://github.com/kedarmhaswade/gradoop_demo/blob/dev/src/main/java/org/gradoop/demo/server/Server.java#L107> a Remote or a Local Environment. The instructions are correct to my knowledge. Thanks for your willingness to try. I have tried everything I can. With different Flink versions, I get different results (I have also tried on 1.6-SNAPSHOT with class loading config being parent-first, or child-first). Regards, Kedar On Wed, Apr 25, 2018 at 1:08 AM, Chesnay Schepler <ches...@apache.org> wrote: > I couldn't spot any error in what you tried to do. Does the job-submission > succeed if you submit the jar through the command-line client? > > Can you share the project, or a minimal reproducing version? > > > On 25.04.2018 00:41, kedar mhaswade wrote: > > I am trying to get gradoop_demo > <https://github.com/dbs-leipzig/gradoop_demo> (a gradoop based graph > visualization app) working on Flink with *Remote* Execution Environment. > > This app, which is based on Gradoop, submits a job to the *preconfigured* > execution environment, collects the results and sends it to the UI for > rendering. > > When the execution environment is configured to be a LocalEnvironment > <https://ci.apache.org/projects/flink/flink-docs-stable/api/java/org/apache/flink/api/java/LocalEnvironment.html>, > everything works fine. But when I start a cluster (using < > flink-install-path>/bin/start-cluster.sh), get the Job Manager endpoint > (e.g. localhost:6123) and configure a RemoteEnvironment > <https://ci.apache.org/projects/flink/flink-docs-stable/api/java/org/apache/flink/api/java/ExecutionEnvironment.html#createRemoteEnvironment-java.lang.String-int-org.apache.flink.configuration.Configuration-java.lang.String...-> > and > use that environment to run the job, I get exceptions [1]. > > Based on the class loading doc > <https://ci.apache.org/projects/flink/flink-docs-master/monitoring/debugging_classloading.html>, > I copied the gradoop classes (gradoop-flink-0.3.3-SNAPSHOT. > jar, gradoop-common-0.3.3-SNAPSHOT.jar) to the <flink-install-path>/lib > folder (hoping that that way those classes will be available to all the > executors in the cluster). I have ensured that the class that Flink fails > to load is in fact available in the Gradoop jars that I copied to the /lib > folder. > > I have tried using the RemoteEnvironment method with jarFiles argument > where the passed JAR file is a fat jar containing everything (in which case > there is no Gradoop JAR file in /lib folder). > > So, my questions are: > 1) How can I use RemoteEnvironment? > 2) Is there any other way of doing this *programmatically? *(That means I > can't do flink run since I am interested in the job execution result as a > blocking call -- which means ideally I don't want to use the submit RESTful > API as well). I just want RemoteEnvironment to work as well as > LocalEnvironment. > > Regards, > Kedar > > > [1] > 2018-04-24 15:16:02,823 ERROR org.apache.flink.runtime.jobmanager.JobManager > - Failed to submit job 0c987c8704f8b7eb4d7d38efcb3d708d > (Flink Java Job at Tue Apr 24 15:15:59 PDT 2018) > java.lang.NoClassDefFoundError: Could not initialize class > *org.gradoop.common.model.impl.id.GradoopId* > at java.io.ObjectStreamClass.hasStaticInitializer(Native Method) > at java.io.ObjectStreamClass.computeDefaultSUID( > ObjectStreamClass.java:1887) > at java.io.ObjectStreamClass.access$100(ObjectStreamClass.java:79) > at java.io.ObjectStreamClass$1.run(ObjectStreamClass.java:263) > at java.io.ObjectStreamClass$1.run(ObjectStreamClass.java:261) > at java.security.AccessController.doPrivileged(Native Method) > at java.io.ObjectStreamClass.getSerialVersionUID( > ObjectStreamClass.java:260) > at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:682) > at java.io.ObjectInputStream.readNonProxyDesc( > ObjectInputStream.java:1876) > at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1745) > at java.io.ObjectInputStream.readClass(ObjectInputStream.java:1710) > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1550) > at java.io.ObjectInputStream.readObject(ObjectInputStream.java:427) > at java.util.HashSet.readObject(HashSet.java:341) > 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 java.io.ObjectStreamClass.invokeReadObject( > ObjectStreamClass.java:1158) > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2169) > at java.io.ObjectInputStream.readOrdinaryObject( > ObjectInputStream.java:2060) > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1567) > at java.io.ObjectInputStream.defaultReadFields( > ObjectInputStream.java:2278) > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2202) > at java.io.ObjectInputStream.readOrdinaryObject( > ObjectInputStream.java:2060) > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1567) > at java.io.ObjectInputStream.readObject(ObjectInputStream.java:427) > at org.apache.flink.util.InstantiationUtil.deserializeObject( > InstantiationUtil.java:290).... > > >
