What does a Replica ID in Azure Service Fabric really represent?

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What is the significance of the replica id for a stateful service in Azure Service Fabric. To be clear, I understand what a replica is, but I don't understand why a replica in two completely different services would end up with the same ID and/or why for a given service the number of replica IDs is far greater than the TargetReplicaSetSize.

I was trying to identify the replicas that belonged to each partition of a stateful service, and had hoped/assumed the replica id would do that. How could I make this determination?

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To add, given Rotem's guidance below, here is a snapshot of the replicas on one of my nodes. Note the first two lines have the same replica id, but belong to different partitions, that's the part I don't get.

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Similarly, here you see the same replica id used for two different services:

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Clearly, I keep using 'replica id' but that word does not mean what I think it means... what does it mean.

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azureazure-service-fabric
as for "why for a given service the number of replica IDs is far greater than the TargetReplicaSetSize." I wonder what is the value of "Min Replica Set Size" ? – Rotem Varon
target is 3, min is 2, partition count 9... I see the 27 leaf nodes I would expect. – Jim O'Neil
I added an answer as I cannot add pics in the comments. Plz let us know if this help... – Rotem Varon
Well, the first replica is primary while the second one is secondary. hence, different partition scalability... – Rotem Varon

2 Answers

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Replica ID uniquely identifies a replica within a partition, and only within a partition. You'll notice management operations on replicas require you to specify both a replica ID and a partition ID.

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"identify the replicas that belonged to each partition" enter image description here enter image description here

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