[v23.1.x] Evenly distributing topic partitions when adding node to cluster #9482
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Using bitfield to randomly sample topic partitions to move when handing node addition and on demand rebalancing. Randomly choosing partitions from a topic prevents Redpanda from moving all partitions from the same topic to newly added node. Fixes: redpanda-data#9261 Signed-off-by: Michal Maslanka <michal@redpanda.com> (cherry picked from commit 66f1d7e)
Added test validating if topics are equally spread around the cluster after reallocating partitions on node addition. Signed-off-by: Michal Maslanka <michal@redpanda.com> (cherry picked from commit 15af790)
Fixed stopping partition rebalancing by removing only those reallocations which belongs to domain that does not bring the improvement instead of the all reallocations. Signed-off-by: Michal Maslanka <michal@redpanda.com> (cherry picked from commit eb77041)
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Backport of PR #9344
Fixes #9481,