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Hadoop 2.2 uses protobuf 2.5 for its RPC, and Flume loads its older packaged version of protobuf ahead of Hadoop’s, which causes this error. To fix this you’ll need to move both protobuf and guava ou...

flume-ng agent -n a1 -c conf -f source_netcat-sink_logger.properties telnet localhost 44444         flume-ng agent -n a1 -c conf -f source_avro-sink_filerole.properties flume-ng avro-client -H...