liqul / blog

• 👋 Hi, I’m Liqun LI
• 👀 I’m interested in learning new technologies and building systems
• 🌱 I’m currently learning prompting LLMs for various interesting scenarios
• 💞️ I’m looking to collaborate on anything interesting projects
• 📫 Please reach me via liqul (at) outlook.com

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什么是时序数据？

今天的hitsdb及其它

经济新闻阅读开始

从新闻中学习思考。

读书《李敖自传》

学习HBase

读书《人为制造的脆弱性：银行业危机和信贷稀缺的政治根源》

读书《原则》

总结一下对象存储元数据与文件之间的关系

Data model
metadata -> object
metadata: key + others + create_time + pointer

Lock based

insert：

1. lock the key, even if the key is not presented
2. read by the key
   2.1 if does not exist, insert
   2.2 if exists, update the metadata (including create_time), backup the old pointer
3. es as a special case, no lock but version control

delete:
= insert a tombstone with an empty pointer

update:
only update non-key fields

search:
since each key has only one entry, just find it

MVCC

insert:
insert with current timestamp as version. if two insertions with the same version, one fails

delete:
= insert a tombstone with an empty pointer

update:
= insert a new version with a new timestamp. and other unmodified fields the same with the latest version

search:
for each key, get the version with the latest timestamp

新闻每日读

性质和方法

exactly once = user-defined id + server-side deduplication
-> server-side cache -> batch process with snapshot -> delay

strong consistency -> single-point failure | wal with consensus support

strong scalability -> consistency hash

two-phase commit -> distributed transaction

atomicity -> transaction + (lock | mvcc)

test

test

读书《A Man for All Markets》

读书《斯坦福极简经济学》

鸿学院2018-04-14总结

关于叙利亚问题的逻辑。 #14

可以讨论一下各个不同git托管相关的任务管理

读书《国史大纲》

学习Cassandra

投资心法