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 <bort...@okkam.it> 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 *_______________________________________________ > *OKKAM**Srl **- www.okkam.it <http://www.okkam.it/>* > > *Email:* bort...@okkam.it > > *Phone nr: +39 0461 1823912 <%2B39%200461%201823912> * > > *Headquarters:* Trento (Italy), Via Trener 8 > *Registered office:* Trento (Italy), via Segantini 23 > > Confidentially notice. This e-mail transmission may contain legally > privileged and/or confidential information. Please do not read it if you > are not the intended recipient(S). Any use, distribution, reproduction or > disclosure by any other person is strictly prohibited. If you have received > this e-mail in error, please notify the sender and destroy the original > transmission and its attachments without reading or saving it in any manner. > >
