Ensures the load of pipelines does not exceed 80%. #4032
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The logic is isolated from the actor. This PR still misses several refinement: - introduce locality in the optimization algorithm - split the list of shards into several pipelines if necessary. - add an actual cost function and a BFS.
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The allocation attempts to match the previous plan as much as possible. It also includes some hysteresis effect to avoid flip flapping between two N and N+1 pipelines. Closes #4010
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The allocation attempts to match the previous
plan as much as possible.
It also includes some hysteresis effect to avoid
flip flapping between two N and N+1 pipelines.
Closes #4010