Function flushSlaveKeysWithExpireList

app/redis-6.2.6/src/expire.c:462–467

Remove the keys in the hash table. We need to do that when data is * flushed from the server. We may receive new keys from the master with * the same name/db and it is no longer a good idea to expire them. * * Note: technically we should handle the case of a single DB being flushed * but it is not worth it since anyway race conditions using the same set * of key names in a writable slave and

 * of key names in a writable slave and in its master will lead to
 * inconsistencies. This is just a best-effort thing we do. */
void flushSlaveKeysWithExpireList(void) {
    if (slaveKeysWithExpire) {
        dictRelease(slaveKeysWithExpire);
        slaveKeysWithExpire = NULL;
    }
}

int checkAlreadyExpired(long long when) {
    /* EXPIRE with negative TTL, or EXPIREAT with a timestamp into the past