Graceful shutdown was introduced in Tarantool with [1]. A week later it was reworked with [2]. So the timeline is as follows.
Graceful shutdown is introduced, new feature flag is added and the protocol version is bumped to 4.
Graceful shutdown is reworked, feature flag is dropped and the protocol version is dropped to 3.
Next Tarantool version released.
So the idea for users is "IPROTO_FEATURE_GRACEFUL_SHUTDOWN and protocol version 4 never existed". It also means that any new feature flag may have value 4 (same as IPROTO_FEATURE_GRACEFUL_SHUTDOWN), but with completely different meaning. IPROTO_FEATURE_GRACEFUL_SHUTDOWN flag was added in [3] by mistake due to misunderstanding the event timeline. This patch removes the flag. Since _features dict is an internal of a connection object, the change shouldn't break anything for users.
Graceful shutdown was introduced in Tarantool with [1]. A week later it was reworked with [2]. So the timeline is as follows.
So the idea for users is "IPROTO_FEATURE_GRACEFUL_SHUTDOWN and protocol version 4 never existed". It also means that any new feature flag may have value
4(same as IPROTO_FEATURE_GRACEFUL_SHUTDOWN), but with completely different meaning. IPROTO_FEATURE_GRACEFUL_SHUTDOWN flag was added in [3] by mistake due to misunderstanding the event timeline. This patch removes the flag. Since_featuresdict is an internal of a connection object, the change shouldn't break anything for users.Closes #262