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what happen if enable datahub active-active clustering

Hi Experts , Can anyone please suggest about below issues :

What will happen if we enable datahub active-active clustering

1 > pros/cons : what will be pros/cons if we used active-active clustering .

2 > tasks : which type of tasks we have to handle .

3 > roles & responsibility : what will be roles and responsibility

4 > issues : Any issues will be raised ?

Thanks in advance .

Regards,

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  • Posted on Feb 05, 2019 at 07:21 PM

    If I understand correctly by "active-active" clustering you mean a cluster will all nodes "equal" and participating in all Data Hub processes, i.e. data loading, composition and publication. If it's so, the I would strongly advise against doing so. The main concern is data integrity and consistency. DataHub restricts compositions/publications to one at a time in a given data pool for exactly that reason. Otherwise, data loss is possible or older data may override newer data.

    Another set of problems is related to recovery after crash/restart while DataHub was performing a composition or publication. Normally only master node is responsible for that recovery. With multiple nodes being active and performing that recovery the correct data recovery is impossible.

    The only condition when active-active cluster would work correctly, if data pools would locked to a specific node in the cluster. But that is not a true cluster but rather several independent Data Hub instances.

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