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RobThree / IdGen

Twitter Snowflake-alike ID generator for .Net
MIT License
1.19k stars 149 forks source link

Confirm IdGen Generator Id Always Unique！ #9

Closed xingwen1987 closed 6 years ago

xingwen1987 commented 6 years ago

https://www.cnblogs.com/yushuo/p/9406906.html This blog information, only to explain Twitter's Snowflake algorithm will create a lots of same Id under the pressure test using Jmeter when test thread number >= 1000,

select DataId from IdTest GROUP BY DataId HAVING COUNT(DataId)>1 this SQL means how many data are duplicated. image

so I hope that our IdGen can do a good stress test, and give us test result, to ensure that the generated Id is always unique.

Thanks！

RobThree commented 6 years ago

See #8 for those confused by this "issue".

only to explain Twitter's Snowflake algorithm will create a lots of same Id

No, the algorithm doesn't. Your implementation of it does (apparently).

From the README:

The generator-id-part of the Id is the part that you 'configure'; it could correspond to a host, thread, datacenter or continent: it's up to you. However, the generator-id should be unique in the system: if you have several hosts or threads generating Id's, each host or thread should have it's own generator-id.

If you're using multiple generators (across machines or in separate threads or...) you'll want to make sure each generator is assigned it's own unique Id.