Fix to order inversion between commit and user threads #215
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* If the commit thread executes the state machine operation before the user thread (in the middle of `append_entries`) installs the commit element, the user's callback function can be missed. * Commit thread should make sure that if order inversion is detected, it should let user thread invoke the callback, by generating the corresponding commit element initialized with the state machine result.
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If the commit thread executes the state machine operation before the
user thread (in the middle of
append_entries) installs the commitelement, the user's callback function can be missed.
Commit thread should make sure that if order inversion is detected,
it should let user thread invoke the callback, by generating the
corresponding commit element initialized with the state machine result.