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AOF 持久化方式有哪些? 这里提到的 appendfsync always:主线程调用 write 执行写操作后,后台线程( aof_fsync 线程)立即会调用 fsync 函数同步 AOF 文件(刷盘),fsync 完成后线程返回,这样会严重降低 Redis 的性能(write + fsync) 实际上可能是主线程直接调用 fsync,而没有用到后台线程。7.2版本源码中 try_fsync: ...
  • YangooSen
  • Opened 
    2 days ago
  • #2697

img width= 838 height= 191 alt= Image src= https://github.com/user-attachments/assets/280d073f-c8dc-4e0a-812e-f33230d12eb1 / 关于文章中提到的,同步非阻塞 IO。容易有一点误解,轮询也是会占用线程的使用时间的。 实际上的轮询,不是一直在轮询,而是一个隔一段时间,进行一个询问。 ...
  • blueair5
  • Opened 
    14 days ago
  • #2695

我用 n8n 准备将每个章节的内容整理成播客。可以方便路上收听 https://www.xiaoyuzhoufm.com/episodes/6868747593fd2d72b89958f0
  • licc168
  • 3
  • Opened 
    22 days ago
  • #2692

Image 应该是长度。
  • blueair5
  • 1
  • Opened 
    25 days ago
  • #2688

再来看一个常见的面试题:如果有索引 联合索引(a,b,c),查询 a=1 AND c=1 会走索引么?c=1 呢?b=1 AND c=1 呢? 我认为可以增加一个示例,如果是 a = 1 AND c = 1 AND b = 1 的情况下,这个会走索引吗?我在实际的工作中,以为这个只有 a = 1 走了部分索引,实际根据 explain 的执行结果,都走了索引。同理 b = 1 AND c = 1 ...
  • blueair5
  • Opened 
    26 days ago
  • #2686

  • 1693750531
  • Opened 
    28 days ago
  • #2684

下面的几个方法都使用的 BigDecimal(double),是否会造成精度问题。 Image Image
  • noixcn
  • Opened 
    on Jun 6
  • #2680

Image
  • spirit-unpredictable
  • 1
  • Opened 
    on May 12
  • #2670

// 线程 A map.putIfAbsent(key, value); // 线程 B map.putIfAbsent(key, anotherValue); eg: public static void main(String[] args) { Map String, Integer map = new ConcurrentHashMap (); ...
question
  • GuZyx
  • 1
  • Opened 
    on Apr 28
  • #2668

用 https://javaguide.cn/cs-basics/algorithms/10-classical-sorting-algorithms.html#%E4%BB%A3%E7%A0%81%E5%AE%9E%E7%8E%B0-5 是过不了 https://leetcode.cn/problems/sort-an-array/description/ 因为有很多没有意义的交换 这里给出正确的代码,除了最后一个三元组外其他用例都能过 ...
  • zhengzavan
  • 1
  • Opened 
    on Apr 17
  • #2664
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