Function clearReplicationId2

app/redis-6.2.6/src/replication.c:1392–1396

Clear (invalidate) the secondary replication ID. This happens, for * example, after a full resynchronization, when we start a new replication * history. */

 * example, after a full resynchronization, when we start a new replication
 * history. */
void clearReplicationId2(void) {
    memset(server.replid2,'0',sizeof(server.replid));
    server.replid2[CONFIG_RUN_ID_SIZE] = '\0';
    server.second_replid_offset = -1;
}

/* Use the current replication ID / offset as secondary replication
 * ID, and change the current one in order to start a new history.