Redis键值设计

1.优雅的key

2.拒绝BigKey

2.1.什么是BigKey

2.2.BigKey的危害

2.3.如何发现BigKey

scan扫描示例代码

    final static int STR_MAX_LEN = 10 * 1024;final static int HASH_MAX_LEN = 500;@Testvoid testScan() {int maxLen = 0;long len = 0;String cursor = "0";do {// 扫描并获取一部分keyScanResult<String> result = jedis.scan(cursor);// 记录cursorcursor = result.getCursor();List<String> list = result.getResult();if (list == null || list.isEmpty()) {break;}// 遍历for (String key : list) {// 判断key的类型String type = jedis.type(key);switch (type) {case "string":len = jedis.strlen(key);maxLen = STR_MAX_LEN;break;case "hash":len = jedis.hlen(key);maxLen = HASH_MAX_LEN;break;case "list":len = jedis.llen(key);maxLen = HASH_MAX_LEN;break;case "set":len = jedis.scard(key);maxLen = HASH_MAX_LEN;break;case "zset":len = jedis.zcard(key);maxLen = HASH_MAX_LEN;break;default:break;}if (len >= maxLen) {System.out.printf("Found big key : %s, type: %s, length or size: %d %n", key, type, len);}}} while (!cursor.equals("0"));}

2.4.如何删除BigKey

3.恰当的数据类型