Function replicationRequestAckFromSlaves

app/redis-6.2.6/src/replication.c:3162–3164

This just set a flag so that we broadcast a REPLCONF GETACK command * to all the slaves in the beforeSleep() function. Note that this way * we "group" all the clients that want to wait for synchronous replication * in a given event loop iteration, and send a single GETACK for them all. */

 * we "group" all the clients that want to wait for synchronous replication
 * in a given event loop iteration, and send a single GETACK for them all. */
void replicationRequestAckFromSlaves(void) {
    server.get_ack_from_slaves = 1;
}

/* Return the number of slaves that already acknowledged the specified
 * replication offset. */