def METHOD_NAME(self, mcrouter, raw):
    args = []
    if raw:
        args.append('--raw')
    mcpiper = Mcpiper(mcrouter.debug_fifo_root, args)
    # Make sure mcrouter creates fifos and start replicating data to them.
    mcrouter.set('abc', '123')
    mcrouter.delete('abc')
    time.sleep(3)
    return mcpiper