[GitHub] [pinot] siddharthteotia edited a comment on issue #8090: Partitioned replica group assignment fails if "numReplicaGroups": 1

[GitBox <gi...@apache.org>]

siddharthteotia edited a comment on issue #8090:
URL: https://github.com/apache/pinot/issues/8090#issuecomment-1027723877


   `numReplicaGroups` as 1 in `replicaGroupPartitionConfig` is treated as non-replica group based assignment. The concept of `numPartitions` and `numInstancesPerPartition` is only applicable to replica group based instance assignment.
   
   We can consider fixing this -- will have to discuss the semantics of interpreting numReplicaGroups in a couple of places in the code. When assigning instances in replica group based manner at the time of table creation, we don't check numReplicaGroups=1 and proceed with replica group based instance assignment. Ideally we should have failed here itself. Instead we proceed to assign instances to a single replica group. 
   
   However, at the time of table rebalance we interpret numReplicaGroups=1 as non-replica group based and throw error if numPartitions is != 1
   
   For now if you really want to create a replica group based table with a single replica group, you can use the legacy way of specifying replica group assignment strategy in the table config


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