Cascade Management Case Study
3.2 Cascade Management
Cascade management is responsible for managing conferences that joins the cascade, tracking and removing the conference in the cascade. In H.323 the cascade management is one of restricting factors that hinders scalability because it places the cascade management in a single MCU(can be compared to a single server) called the master which can be the bottleneck. In addition the master MCU, is a single point of failure which if it fails all conference in the cascade will be disconnected.
In this design the cascade management is placed in a Highly Available load balancer which here on be called the Cascade Manager (CM). In MCONF, it has already a highly available load balancer which serves for conference creation and
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It would be able to add and remove conferences while the conferences is ongoing without a restart. In order to attain this the conference servers should be registered in the CM beforehand, which is already implemented in the MCONF. If the conference is registered the CM would be able to communicate with the conference which will be needed for the next functions that is needed for the CM.
Cascade Manager
We identify that Cascade Manager will require the following functions cascade creation, cascade discovery, conference joining the cascade, conference leaving the cascade ( termination). In addition, the cascade manager makes sure that there is no conflict in the conference control between conferences that in cascade. Moreover, this serves as the central lookup when conferences data are synchronized. Lastly, the cascade manager is responsible for initiating the distribution of audio and video between conference servers.
a. Creation
Figure. 3.2 Creating a
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Since we already have the combined list of users. To avoid a collision of who will be the floor chair, the floor chair is already read from the cascade owner. Updating the floor chair is also initially update from the cascade owner. The effect of this will allow each conference to independently function with their own Conference Control while anyone in the cascaded conference can become the floor
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