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Displaying posts with tag: Crashed MySQL (reset)

Dec

2019

Re-Slaving a Crashed MySQL Master Server in Semisynchronous Replication Setup

Posted by ScaleGrid.io on Mon 09 Dec 2019 20:53 UTC
Tags:

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In a MySQL 5.7 master-slave setup that uses the default semisynchronous replication setting for rpl_semi_sync_master_wait_point, a crash of the master and failover to the slave is considered to be lossless. However, when the crashed master comes back, you may find that it has transactions that are not present in the current master (which was previously a slave). This behavior may be puzzling, given that semisynchronous replication is supposed to be lossless, but this is actually an expected behavior in MySQL. Why exactly this happens is explained in full detail in the …

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