Publish-Subscribe message

[magsi arif hussain]

Hello,

I need to answer following question please.

In Publish-Subscribe approach, a subscriber remains disconnected/ Absent from network for several days. After Re-joining the network, a subscriber wants to receive all those packets which were shared during its absence.

How is it possible to receive all those packets which were shared during subscriber's absence?

Looking for reponse.

With High Regards,

Arif

[David Maier (Redis Labs)]

Hi Arif,

PubSub is fire and forget, which means that only subscribers that are present are able to receive the published messages. If you want to have something that is keeping the messages, then you should go with Redis Streams. With streams a 'subscriber/consumer' could remember the last id that was consumed, and then request the new messages (that were produced during its absence).

Further details can be found here:

• http://antirez.com/news/114
• https://redis.io/topics/streams-intro
  

Hope this helps.

Regards,

David

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[Reg Reg]

Hi, 

Cant, we use the Redis Streams as fire and forget scenarios?  I want to drop the messages from the streams when the subscriber is not online.