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Klaus Aehlig authored
When considering the various ways of positioning an instance on a pair of nodes, make use of the fact that the statistics are extremely similar (only two nodes changed) and obtain the new statistics by updating the old one, rather than by recomputing it from scratch. Signed-off-by: Klaus Aehlig <aehlig@google.com> Reviewed-by: Petr Pudlak <pudlak@google.com>
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