17:28:22.819 * Non blocking connect for SYNC fired the event.17:28:22.824 * Master replied to PING, replication can continue…17:28:22.824 * Trying a partial resynchronization (request c9fabd3812295cc1436af69c73256011673406b9:1745240101942).17:28:22.825 * Successful partial resynchronization with master.
1) Bulk transfer I/O during SYNC, from the point of view of slave.
2) Master timeout from the point of view of slaves (data, pings).
3) Slave timeout from the point of view of masters (REPLCONF ACK pings).
every time there is low traffic between the master and the slave.