误用Redis命令导致服务器挂了，领导让我写事故报告

redis> MSET one 1 two 2 three 3 four 4
OK
redis> KEYS *o*
1) "four"
2) "one"
3) "two"
redis> KEYS t??
1) "two"
redis> KEYS *
1) "four"
2) "three"
3) "one"
4) "two"
redis>

redis 127.0.0.1:6379> scan 0
1) "17"
2)  1) "key:12"
    2) "key:8"
    3) "key:4"
    4) "key:14"
    5) "key:16"
    6) "key:17"
    7) "key:15"
    8) "key:10"
    9) "key:3"
   10) "key:7"
   11) "key:1"
redis 127.0.0.1:6379> scan 17
1) "0"
2) 1) "key:5"
   2) "key:18"
   3) "key:0"
   4) "key:2"
   5) "key:19"
   6) "key:13"
   7) "key:6"
   8) "key:9"
   9) "key:11"

// 游标初始值为0
String cursor = ScanParams.SCAN_POINTER_START;
String key = "PLFX-ZZSFP-*";
ScanParams scanParams = new ScanParams();
scanParams.match(key);// 匹配以 PLFX-ZZSFP-* 为前缀的 key
scanParams.count(1000);
while (true){
  //使用scan命令获取数据，使用cursor游标记录位置，下次循环使用
  ScanResult<String> scanResult = jedis.scan(cursor, scanParams);
  cursor = scanResult.getStringCursor();// 返回0 说明遍历完成
  List<String> list = scanResult.getResult();
  long t1 = System.currentTimeMillis();
  for(int m = 0;m < list.size();m++){
    String mapentry = list.get(m);
    System.out.println(mapentry);
    //jedis.del(key, mapentry);
  }
  long t2 = System.currentTimeMillis();
  System.out.println("获取" + list.size()+ "条数据，耗时: " + (t2-t1) + "毫秒,cursor:" + cursor);
  if ("0".equals(cursor)){
    break;
  }
}

Map<String, JedisPool> clusterNodes = jedisCluster.getClusterNodes();
for (Map.Entry<String, JedisPool> entry : clusterNodes.entrySet()) {
  //获取单个的jedis对象
  Jedis jedis = entry.getValue().getResource();
  // 判断非从节点(因为若主从复制，从节点会跟随主节点的变化而变化)，此处要使用主节点从主节点获取数据
  if (!jedis.info("replication").contains("role:slave")) {
      List<String> keys = getScan(jedis, matchKey);
      if (keys.size() > 0) {
          Map<Integer, List<String>> map = new HashMap<>(8);
          //接下来的循环不是多余的，需要注意
          for (String key : keys) {
              // cluster模式执行多key操作的时候，这些key必须在同一个slot上，不然会报:JedisDataException:
              int slot = JedisClusterCRC16.getSlot(key);
              // 按slot将key分组，相同slot的key一起提交
              if (map.containsKey(slot)) {
                  map.get(slot).add(key);
              } else {
                  List<String> list1 = new ArrayList();
                  list1.add(key);
                  map.put(slot, list1);
              }
          }
          for (Map.Entry<Integer, List<String>> integerListEntry : map.entrySet()) {
              list.addAll(integerListEntry.getValue());
          }
      }
  }
}

public static List<String> getScan(Jedis redisService, String key) {
    
    List<String> list = new ArrayList<>();
    //扫描的参数对象创建与封装
    ScanParams params = new ScanParams();
    params.match(key);
    //扫描返回一百行，这里可以根据业务需求进行修改
    params.count(100);
    String cursor = "0";
    ScanResult scanResult = redisService.scan(cursor, params);

    //scan.getStringCursor() 存在 且不是 0 的时候，一直移动游标获取
    while (null != scanResult.getStringCursor()) {
        //封装扫描的结果
        list.addAll(scanResult.getResult());
        if (! "0".equals( scanResult.getStringCursor())) {
            scanResult = redisService.scan(cursor, params);
        } else {
            break;
        }
    }
    return list;
}