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def disableOptimisticGetParentMap(self):
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# Tweak some class variables to stop remote get_parent_map calls asking
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# for or receiving more data than the caller asked for.
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'_walk_to_common_revisions_batch_size', 1)
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self.overrideAttr(SmartServerRepositoryGetParentMap,
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'no_extra_results', True)