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movePrimary can return the error 'it is already the primary' and is asserted in mongos_validate_writes.js. Instead, use ensurePrimaryShard, which handles and ignores this error. It's fine to ignore this error because it means that the goal is already accomplished, which randomly may be the case.

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xgen-internal-githook commented on Tue, 11 Jul 2017 17:36:48 +0000: Author: {u'username': u'DiannaHohensee', u'name': u'Dianna Hohensee', u'email': u'dianna.hohensee@10gen.com'} Message: SERVER-30067 Use ensurePrimaryShard instead of movePrimary in mongos_validate_writes.js Branch: master https://github.com/mongodb/mongo/commit/eb43e76f419566c24624067edc6ae723ac57865f

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