private GetCommand convert2GetCommand(final String topic, final int partition, final String group,
            final long offset, final int maxSize) {
        return new GetCommand(topic, group, partition, offset, maxSize, 0);
    }
Use Jetty as http server and handle request of get message/put message/get
offset
metamorphosis-server-wrapper/src/main/java/com/taobao/metamorphosis/http/processor/MetamorphosisOnJettyProcessor.java