How to confirm serializer type on workers?

[Aureliano Buendia <bu...@gmail.com>]

Hi,


I'm using kryo serializer, but getting java.io.EOFException error when
broadcasting an object. It seems one of the reasons for getting this error
is that the workers are not aware of the kryo serializer.

In the app code, before creating the context, I have:

System.setProperty("spark.serializer",
"org.apache.spark.serializer.KryoSerializer")
System.setProperty("spark.kryo.registrator", "myRegistrator")

Does this only work on the master and not on the workers?

I've also tried setting this in conf/spark-env.sh:

export
SPARK_JAVA_OPTS="-Dspark.serializer=org.apache.spark.serializer.KryoSerializer
-Dspark.kryo.registrator=my.Registrator"

But I'm still getting the eof error.

How is it possible to programmatically set the kryo serializer on the
workers side, the same as it is done on the master?

Re: How to confirm serializer type on workers?

[Eugen Cepoi <ce...@gmail.com>]

Do you have the stacktrace?
I had something similar, where the Kryo deser was throwing EOF, but in fact
EOF means nothing, spark catches Kryo exceptions and then throws EOF (and
loses the reason...), in my case kryo couldn't find the class to which to
deser.


2014/1/8 Aureliano Buendia <bu...@gmail.com>

> Hi,
>
>
> I'm using kryo serializer, but getting java.io.EOFException error when
> broadcasting an object. It seems one of the reasons for getting this error
> is that the workers are not aware of the kryo serializer.
>
> In the app code, before creating the context, I have:
>
> System.setProperty("spark.serializer",
> "org.apache.spark.serializer.KryoSerializer")
> System.setProperty("spark.kryo.registrator", "myRegistrator")
>
> Does this only work on the master and not on the workers?
>
> I've also tried setting this in conf/spark-env.sh:
>
> export
> SPARK_JAVA_OPTS="-Dspark.serializer=org.apache.spark.serializer.KryoSerializer
> -Dspark.kryo.registrator=my.Registrator"
>
> But I'm still getting the eof error.
>
> How is it possible to programmatically set the kryo serializer on the
> workers side, the same as it is done on the master?
>