Contents
Can a subscriber be a publisher?
In terms of Reactive Streams, there is a Publisher and it could have as many Subscribers.
What is publisher distributor and subscriber replication?
A publisher is the main database copy on which publication is configured, making data available to other MS SQL servers that are configured to be used in the replication process. The Publisher can have more than one publication. A subscriber is a database that receives the replicated data from a publication.
What is the difference between CUCM publisher and subscriber?
The publisher verifies the subscriber’s authenticity and adds the subscriber’s IP address to its dynamic firewall (iptables). The subscriber is allowed to access the publisher database. The database content is replicated from the publisher to the subscriber.
What is meant by publisher vs subscriber?
The provider of the information is called a publisher . Publishers supply information about a subject without needing to know anything about the applications that are interested in the information. The consumer of the information is called a subscriber .
Which database is created when replication is installed?
Publisher Database
Publisher Database: The Publisher is a database that contains a list of objects designed as replication articles. The Publisher may have one or more publications. Each Publisher creates many internal replication stored procedures that define a data propagation mechanism.
How many publishers and subscribers are in one cluster?
Only one publisher server is allowed in the cluster. The publisher houses the read/write copy of the database. Up to eight subscriber servers can be in the cluster, with the restriction that only four of the subscriber servers can perform active call processing.
How many call processing agents can be active in a CUCM cluster?
A cluster consists of one publisher and a total maximum of 20 servers (nodes) running various services, including TFTP, media resources, conferencing, and call processing. You can have a maximum of eight nodes for call processing (running the Cisco CallManager service).
How does Publisher Subscriber work?
Publish/Subscribe (Pub/Sub) messaging provides instant event notifications for these distributed applications. The Publish Subscribe model allows messages to be broadcast to different parts of a system asynchronously. To broadcast a message, a component called a publisher simply pushes a message to the topic.
Why do combine subscribers only work on int publishers?
The typealias declarations in the code above specify that this subscriber takes Int as its input, and because Never is the failure type, we don’t expect publishers that this subscriber subscribes to emit failures. This subscriber will only work on publishers that emit Int values, and no errors.
How is a subscription passed to a subscriber?
When a subscriber is created and subscribes to a publisher, the publisher will create a subscription object and it passes a reference to the subscription to the subscriber. The subscriber will then request a number of values from the subscription in order to begin receiving those values.
How to limit the number of items you receive from a publisher?
If you want to limit the number of items received from a publisher, you can call request with Subscribers.Demand.max (Int) where Int is replaced with the number of items that should be received. As new values come in, a subscriber can update the number of values it wants to receive from the publisher. Note that this number can only be incremented.
How is a subscriber relationship solidified in combine?
A publisher/subscriber relationship in Combine is solidified in a third object, the subscription. When a subscriber is created and subscribes to a publisher, the publisher will create a subscription object and it passes a reference to the subscription to the subscriber.