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Could blocks from same replica be allocated within same server?

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Could blocks from same replica be allocated within same server?

Rising Star

I am configuring rack awareness within my cluster which is build with 5 data nodes on 3 racks as below:

rack_1 = node1

rack_2 = node2 node3

rack_3 = node4


I want to understand that if without rack awareness configured, my 3 blocks from same replica could be allocated within one node? Could this happen if I do not set rack awareness?


Regards!