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If the slave gets a reconnect in the middle of a GTID event group, normally it will re-fetch that event group, skipping the first part that was already queued for the SQL thread. However, if the master crashed while writing the event group, the group is incomplete. This patch detects this case and makes sure that the transaction is rolled back and nothing is skipped from any following event groups. Similarly, a network proxy might cause the reconnect to end up on a different master server. Detect this by noticing a different server_id, and similarly in this case roll back the partially received group. |
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