hello-samza hangs when we use StreamAppender

I added StreamAppender to log4j.xml , task.log4j.system=kafka in the config and added a simple log line in process call to see if it creates the logging event correctly.
When I deploy the job (WikipediaFeedStreamTask.java), the AppMaster seems to just hang in the bootstrap method. I don’t get any exceptions in the AppMaster logs. I checked the kafka logs and found some socket closed errors in the stack trace.

==> deploy/kafka/logs/kafka.log <==
[2015-06-25 16:48:01,179] ERROR Closing socket for /172.21.132.57 because of error (kafka.network.Processor)
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
at sun.nio.ch.IOUtil.write(IOUtil.java:65)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471)
at kafka.api.TopicDataSend.writeTo(FetchResponse.scala:123)
at kafka.network.MultiSend.writeTo(Transmission.scala:101)
at kafka.api.FetchResponseSend.writeTo(FetchResponse.scala:231)
at kafka.network.Processor.write(SocketServer.scala:472)
at kafka.network.Processor.run(SocketServer.scala:342)
at java.lang.Thread.run(Thread.java:745)

==> deploy/kafka/logs/server.log <==
[2015-06-25 16:48:01,179] ERROR Closing socket for /172.21.132.57 because of error (kafka.network.Processor)
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
at sun.nio.ch.IOUtil.write(IOUtil.java:65)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471)
at kafka.api.TopicDataSend.writeTo(FetchResponse.scala:123)
at kafka.network.MultiSend.writeTo(Transmission.scala:101)
at kafka.api.FetchResponseSend.writeTo(FetchResponse.scala:231)
at kafka.network.Processor.write(SocketServer.scala:472)
at kafka.network.Processor.run(SocketServer.scala:342)
at java.lang.Thread.run(Thread.java:745)

Need to investigate this issue further. looks like the CoordinatorStream is conflicting with the StreamAppender components.