Re: starting flink job from bash script with maven

Posted by Stephan Ewen on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/starting-flink-job-from-bash-script-with-maven-tp2260p2261.html

Hi!

The user code object (the output format here) has a corrupt serialization routine.

We use default Java Serialization for these objects. Either the MongoHadoopOutputFormat cannot be serialized and swallows an exception, or it overrides the readObject() / writeObject() methods (from Java Serialization) in an inconsistent way.

To figure that out, can you try whether you can manually serialize the MongoHadoopOutputFormat?

Can you try and call "SerializationUtils.clone(new MongoHadoopOutputFormat)", for example at the beginning of your main method? The SerializationUtils are part of Apache Commons and are probably in your class path anyways.

Stephan

On Fri, Jul 24, 2015 at 9:51 AM, Stefano Bortoli <[hidden email]> wrote:

Hi guys!

I could program a data maintenance job using Flink on MongoDB. The job runs smoothly if I start it from eclipse. However, when I try to run it using a bash script invoking a maven exec:java I have a serialization exception:
org.apache.flink.runtime.client.JobExecutionException: Cannot initialize task 'DataSink (org.tagcloud.persistence.batch.MongoHadoopOutputFormat@19b88891)': Deserializing the OutputFormat (org.tagcloud.persistence.batch.MongoHadoopOutputFormat@19b88891) failed: Could not read the user code wrapper: unexpected block data
    at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$submitJob$4.apply(JobManager.scala:523)
    at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$submitJob$4.apply(JobManager.scala:507)

attached the complete stack trace. I thought it was a matter of serializable classes, so I have made all my classes serializable.. still I have the same error. Perhaps it is not possible to do these things with Flink.

any intuition? is it doable?

thanks a lot for your support. :-)

saluti,

Stefano Bortoli, PhD
ENS Technical Director
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