[GitHub] [kafka] lbradstreet opened a new pull request #8708: MINOR: avoid unnecessary list iteration in ApiVersion.lastVersion

[GitBox]

lbradstreet opened a new pull request #8708:
URL: https://github.com/apache/kafka/pull/8708


   We unnecessarily iterate the versions list each time we lookup lastVersion, 
including in the hotpath Log.appendAsFollower. Given that allVersions is a 
constant, this is unnecessary. See the profile below from a relatively low 
replica count cluster. Higher replica count clusters with smaller batches may 
see a slightly larger effect.
   
   
![image](https://user-images.githubusercontent.com/252189/82567449-3d757780-9b32-11ea-9a04-9dc448c0ae3a.png)
   


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