Function changeReplicationId

app/redis-6.2.6/src/replication.c:1384–1387

Change the current instance replication ID with a new, random one. * This will prevent successful PSYNCs between this master and other * slaves, so the command should be called when something happens that * alters the current story of the dataset. */

 * slaves, so the command should be called when something happens that
 * alters the current story of the dataset. */
void changeReplicationId(void) {
    getRandomHexChars(server.replid,CONFIG_RUN_ID_SIZE);
    server.replid[CONFIG_RUN_ID_SIZE] = '\0';
}

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