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Question about slot and yarn vcores

Let's assume I have yarn cluster with 3 nodes, 3 vcores each nodes. So total
available cores = 9

Now if I spin a flink job with taskmanager = 3 and no. of slots per task
manager = 2 ,what will happen :

1. 3 Jvms will be initiated (for each task manager)
2. Each JVM will run 2 threads for tasks .
3. Will each thread will use 1 vcore from yarn or both threads will share
same vcore ??

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