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From Cassa L <lcas...@gmail.com>
Subject Issue with protobuff and Spark cassandra connector
Date Tue, 17 Nov 2015 00:10:58 GMT
Hi,
 Has anyone used Protobuff with spark-cassandra connector? I am using
protobuff-3.0-beta with spark-1.4 and cassandra-connector-2.10. I keep
getting "Unable to find proto buffer class" in my code. I checked version
of protobuff jar and it is loaded with 3.0-beta in classpath. Protobuff is
coming form KAfka stream.

5/11/16 15:32:21 ERROR Executor: Exception in task 2.0 in stage 13.0 (TID
35)
java.lang.RuntimeException: Unable to find proto buffer class:
com.test.serializers.TestEvent$Event
    at
com.google.protobuf.GeneratedMessageLite$SerializedForm.readResolve(GeneratedMessageLite.java:1063)
    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:497)



Here is my code:

JavaDStream<AppRawData> rddStream =protoBuffMsgs.map(protoBuff ->
StreamRawData.convertProtoBuffToRawData(protoBuff));

rddStream.foreachRDD(rdd -> {
    StreamRawData.writeToCassandra(rdd);
    return null;
});

public static void writeToCassandra(JavaRDD<MyData> rowRDD){
    //write to Cassandra
    javaFunctions(rowRDD).writerBuilder("keyspace", "data",
mapToRow(MyData.class)).saveToCassandra();
}

If I remove writeToCassandra() from my code, it works. It also counts and
filters on my protobuff stream of data.

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