Reader subscribed to specific topic and channel,need to get only for specified channel.

nsq.Reader('sample_topic1', 'channel1'

but when request: http://localhost:4151/pub?channel=sample_topic1&topic=channel4 , i expect to receive in reader messages for channel1, but i also got this one for channel4. Is there ability to tell the reader to accept messages only for subscribed channel? How this feature should be implemented? Also i think that i dont understand the purpose of channels, i also created so question here http://stackoverflow.com/questions/43836244/what-is-nsq-channels-stands-for

[dudleycarr]

When you create a Reader, you have to specify both a topic and a channel, and so that Reader is specific to that topic, channel pair.

One helpful way of thinking of topic and channels is to thinking of topics as a collection of things and channels as the action you want to take on the things. For a given thing (topic message), you might want to do more than one action. Let’s say you received a message with a URL in it. You want to store that URL in a database and independently you want to download that URL and save it to disk. You should have two different Readers on different channels for each of those actions, one for saving to the DB and the other for fetching/saving to the file system. The benefit is that if your database is slow, those messages will be processed at a different rate than the other Reader that’s fetching and storing to disk. A contrived example, but hopefully makes the point.

[dudleycarr]

@newasmod Hope you managed to get sorted with nsqd terminology. Closing since I don’t think there’s an issue here with nsqjs.