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Subject [GitHub] [incubator-doris] songenjie commented on pull request #4284: [Apache][Doris][Feature][FE]Support users with high QPS in the same query through result set cache
Date Wed, 26 Aug 2020 06:20:43 GMT

songenjie commented on pull request #4284:
URL: https://github.com/apache/incubator-doris/pull/4284#issuecomment-680682899


   > Hi, I think the selfsame OLAP querys in prod env is very rare. Do you test this PR
in your prod env? what's the cache hit rate?  The Apache Kylin use SQL result cache Like this
PR, After Kylin run many years in MEITUAN, we could confirm the SQL result cache is meaningless
for OLAP system.
   
   
   3ks
   
   the result  cache has been used in Jingdong for more than half a year, and the cache hit
rate is also very high, especially in the e-commerce industry like ours, in special periods
and business scenarios, its hit rate is very high
   
   As far as I know, most of the business of meituan is near real-time, and the scope of business
use and analysis is slightly different from ours. So maybe the hit rate of cache is not high


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