# 改造后的Redis日志同步邏輯
class RLogSync:
    def __init__(self):
        self.log_buffer = CircularBuffer(size=128 * 1024 * 1024)  # 128MB環(huán)形緩沖區(qū)
        
    def write(self, command):
        self.log_buffer.append(command)
        self._flush_to_disk()
        
    def _flush_to_disk(self):
        # 異步批量寫入磁盤，降低I/O壓力
        if time_to_flush():
            batch = self.log_buffer.get_batch()
            disk_writer.write(batch)

// 基于Redis的CRDT計數(shù)器實現(xiàn)
public class CRDTCounter {
    private Jedis jedis;
    public Long increment(String key) {
        long serverTs = System.currentTimeMillis();
        return jedis.eval(
            "local local_ts = redis.call('HGET', KEYS[1], 'ts') " +
            "if local_ts < ARGV[1] then " +
            "  redis.call('HSET', KEYS[1], 'val', ARGV[2]) " +
            "  redis.call('HSET', KEYS[1], 'ts', ARGV[1]) " +
            "  return ARGV[2] " +
            "else " +
            "  return local_ts " +
            "end", 
            1, key, serverTs, serverTs+1
        );
    }
}

def detect_conflict(key, new_val, version):
    current_val, current_ver = redis.get(key)
    if version > current_ver:
        return "ACCEPT_NEW"
    elif version < current_ver:
        return "ACCEPT_OLD"
    else:
        # 業(yè)務(wù)規(guī)則裁決
        return business_resolver(key, new_val, current_val)

upstream redis_cluster {
    zone redis_backend 64k;
    server 10.0.1.1:6379 weight=5;  # 主機房
    server 10.0.2.1:6379 backup;     # 備機房
    # 基于用戶ID的哈希路由
    hash $request_uri consistent;
}

type SyncController struct {
    mu        sync.Mutex
    peers     []*Peer
    backlog   *RingBuffer
    conflict  ConflictResolver
}
func (c *SyncController) HandleCommand(cmd RedisCommand) {
    c.mu.Lock()
    defer c.mu.Unlock()
    // 寫入本地日志
    c.backlog.Write(cmd)
    // 生成全局唯一ID
    opID := generateOpID()
    // 并行發(fā)送至所有節(jié)點
    for _, peer := range c.peers {
        go peer.Send(opID, cmd)
    }
}

class ConflictResolver:
    def __init__(self):
        self.version_vectors = {}
    def resolve(self, key, ops):
        # 收集所有版本向量
        vvs = [op.version_vector for op in ops]
        # 計算合并向量
        merged_vv = self._merge_vectors(vvs)
        # 執(zhí)行CRDT合并
        merged_val = self._apply_crdt(ops, merged_vv)
        return merged_val