service 分类

有Iaas, Paas, SaaS

HDFS


总结☞:

  • HDFS应付不了的场景
  1. 无法低时延
  2. 小文件存储存在空间利用率问题
  3. 文件不可修改

三副本有什么作用

  1. 防止单机故障,提高可用性
  2. 防止大量链接在一台机器上夯住, 网络带宽利用率

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