Redis集群key查询和批量查询key

一、Redis集群key查询实现（scan）

CommandObjects commandObjects = new CommandObjects();
        Set<String> keys = new HashSet<>();
        Map<String, ConnectionPool> map = jedisCluster.getClusterNodes();
        for(Map.Entry<String, ConnectionPool> entry: map.entrySet()){
            Connection connection = entry.getValue().getResource();
            ScanResult<String> scanResult = connection.executeCommand(commandObjects.scan("0", new ScanParams().match(keyMatch).count(Integer.MAX_VALUE)));
            if(scanResult.getResult()!=null){
                keys.addAll(scanResult.getResult());
            }
        }

二、Redis集群key批量查询实现（mget）

  
        CommandObjects commandObjects = new CommandObjects();

        Map<Connection, List<String>> keyMap = new HashMap<>();
        for(String key: keys){
            Connection connection = jedisCluster.getConnectionFromSlot(JedisClusterCRC16.getSlot(key));
            List<String> keyList = keyMap.get(connection);
            if(keyList == null){
                keyList = new LinkedList<>();
                keyMap.put(connection, keyList);
            }
            keyList.add(key);
        }

        Map<String, String> keyValueMap = new HashMap<>();
        for(Map.Entry<Connection, List<String>> entry: keyMap.entrySet()){
            Connection connection = entry.getKey();
            String[] keyArr = entry.getValue().toArray(new String[0]);
            List<String> values = connection.executeCommand(commandObjects.mget(keyArr));
            for(int i=0; i< keyArr.length; i++){
               String value = values.get(i);
               if(value != null){
                   keyValueMap.put(keyArr[i], value);
               }
            }
        }

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