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Error in the database logs: WSREP: unserialize error invalid protocol version 3

DRON4egDRON4eg Current User Role Beginner
Good afternoon, please tell me in the logs of one server (a cluster of 3 nodes) Varning-Error periodically appears:
2020-08-27T10:55:50.536154Z 0 [Warning] WSREP: unserialize error invalid protocol version 3: 71 (Protocol error)
         at gcomm/src/gcomm/datagram.hpp:unserialize():135

With what it can be connected? What can be done to fix this?


  • przemekprzemek Percona Support Engineer Percona Staff Role


    That message usually appears when something external is probing the TCP port used by Galera (4567 by default) communication.

    You can try out to reproduce it by telneting the port or scan it with nmap or similar.

    If all cluster nodes run with same version of Galera plugin, that is unlikely to happen due to any legitimate cluster activity.

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