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Change the balanced partition criteria in scaling up DTs #7768

Commits on Dec 14, 2022

  1. ducky: change the balanced partition criteria

    The assessment whether partitions are balanced were done by comparing
    the number of partitions in each node with the average target ±20%. This
    way went broken with the introduction of partition balancing domains.
    The criteria is changed by this commit to make sure that the number of
    partitions across noded is levelled within a scope of each domain
    separately. Levelled means that min and max # of replicas differ by 1
    at most.
    Re redpanda-data#7418
    dlex committed Dec 14, 2022
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