Question

I have a simple example:

c = tornadoredis.Client()
c.connect()

class SourceHandler(tornado.web.RequestHandler):
@tornado.web.asynchronous
@tornado.gen.engine
def get(self):
    pipe = c.pipeline(transactional=True)
    pipe.zadd( 'test1'), 1212, "test" )
    pipe.zadd( 'test2'), 1212, "test" )
    .....
    pipe.zadd( 'testN'), 1212, "test" )
    res = yield tornado.gen.Task(pipe.execute)
    self.set_header('Content-Type', 'text/html')
    self.render("template.html", title="result")

time for this request = N * time for zadd operation.

Can I decrease time for this request ?

Answer 1

A pipeline request is a transactional request which requires that all operations within it execute as an atomic unit. The statement – res = yield tornado.gen.Task(pipe.execute) will wait until all of the zadd statements are executed until it returns execution back to your get(…) function.

The only way that you could decrease execution time is to remove the gen.engine bits in a fire and forget pattern, though you’ll no longer have any response information.

class SourceHandler(tornado.web.RequestHandler):
    @tornado.web.asynchronous
    def get(self):
        pipe = c.pipeline(transactional=True)
        pipe.zadd( 'test1'), 1212, "test" )
        pipe.zadd( 'test2'), 1212, "test" )
        ...
        pipe.execute()
        # of course you no longer have the response information...
        ...old code...