Redis 大Key的删除的实现策略

[root@localhost ~]# redis-cli -a Redis密码 --bigkeys
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.

# Scanning the entire keyspace to find biggest keys as well as
# average sizes per key type.  You can use -i 0.1 to sleep 0.1 sec
# per 100 SCAN commands (not usually needed).

[00.00%] Biggest string found so far '"k5889"' with 5 bytes
[00.00%] Biggest string found so far '"k607267"' with 7 bytes
[00.00%] Biggest string found so far '"k1802564"' with 8 bytes
[50.00%] Sampled 1000000 keys so far
[100.00%] Sampled 2000000 keys so far

-------- summary -------

Sampled 2000000 keys in the keyspace!
Total key length in bytes is 14888896 (avg len 7.44)

Biggest string found '"k1802564"' has 8 bytes

0 lists with 0 items (00.00% of keys, avg size 0.00)
0 hashs with 0 fields (00.00% of keys, avg size 0.00)
2000000 strings with 14888896 bytes (100.00% of keys, avg size 7.44)
0 streams with 0 entries (00.00% of keys, avg size 0.00)
0 sets with 0 members (00.00% of keys, avg size 0.00)
0 zsets with 0 members (00.00% of keys, avg size 0.00)

127.0.0.1:6379> MEMORY USAGE k10000
(integer) 64

public void delBigHash(String bigHashKey) {
    ScanParams scanParams = new ScanParams().count(100);
    String cursor = "0";
    do {
        ScanResult<Entry<String, String>> scanResult = jedis.hscan(bigHashKey, cursor, scanParams);
        List<Entry<String, String>> entryList = scanResult.getResult();
        if (CollectionUtils.isNotEmpty(entryList)) {
            for (Entry<String, String> entry : entryList) {
                jedis.hdel(bigHashKey, entry.getKey());
            }
        }
        cursor = scanResult.getCursor();
    } while (!"0".equals(cursor));
    jedis.del(bigHashKey);
}

public void delBigList(String bigListKey){
    long llen = jedis.llen(bigListKey);
    int counter = 0;
    int left = 100;
    while (counter < llen) {
        jedis.ltrim(bigListKey, left, llen);
        counter += left;
    }
    jedis.del(bigListKey);
}

public void delBigSet(String bigSetKey){
    ScanParams scanParams = new ScanParams().count(100);
    String cursor = "0";
    do {
        ScanResult<String> scanResult = jedis.sscan(bigSetKey, cursor, scanParams);
        List<String> memberList = scanResult.getResult();
        if (CollectionUtils.isNotEmpty(memberList)) {
            for (String member : memberList) {
                jedis.srem(bigSetKey, member);
            }
        }
        cursor = scanResult.getCursor();
    } while (!"0".equals(cursor));
    jedis.del(bigSetKey);
}

public void delBigZSet(String bigZSetKey){
    ScanParams scanParams = new ScanParams().count(100);
    String cursor = "0";
    do {
        ScanResult<Tuple> scanResult = jedis.zscan(bigZSetKey, cursor, scanParams);
        List<Tuple> tupleList = scanResult.getResult();
        if (CollectionUtils.isNotEmpty(tupleList)) {
            for (Tuple tuple : tupleList) {
                jedis.zrem(bigZSetKey, tuple.getElement());
            }
        }
        cursor = scanResult.getCursor();
    } while (!"0".equals(cursor));
    jedis.del(bigZSetKey);
}