I use Apache as Samza framework for Kafka and I need to share the same RockDBs key-value storage between 2 Tasks.
Is what I can do so without having concurrency on storage Key value?
Do I use the same key-value storage (RockDBs) in 2 different StreamTask same time?
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As of Samza 0.12.0 there is no supported way of sharing stores between tasks. Each store is instantiated (isolated) for each task.
For more info, see the "Local State" section here: http://samza.apache.org/learn/documentation/0.12/container/state-management.html
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I deployed 2 Tasks with same Key-value storage and it's working.
So yes we can.