Cloud Computing——Everything as a Service
service 分类
有Iaas, Paas, SaaS
HDFS
总结☞:
- HDFS应付不了的场景
- 无法低时延
- 小文件存储存在空间利用率问题
- 文件不可修改
三副本有什么作用
- 防止单机故障,提高可用性
- 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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