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Author:
{u'username': u'kaloianm', u'name': u'Kaloian Manassiev', u'email': u'kaloian.manassiev@mongodb.com'}
Message: SERVER-17151 ConfigCoordinator should not call fsync
This is expensive to do, especially with WiredTiger and is not a
deterministic check. This change replaces it with something cheaper, but
has the same outcome - validates that previous writes were successfully
journaled, which is an approximate predictor that subsequent writes have
high chance of succeeding.
Branch: master
https://github.com/mongodb/mongo/commit/41986e669a4ef32b38c433a2cfd0b70e872e6899
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