[GitHub] [rocketmq] ConeyLiu commented on pull request #470: Upgrade JDK dependency and code clean based on the features of JDK 1.8

[GitHub]

Hi, @dongeforever. The `lockTopicConfigTable` is a global lock which can reduce 
the performance of `ConcurrentHashMap`.  The `computIfAbsent` of 
`ConcurrentHashMap` can provide an atomic operation with better performance. 
This is should be an improvement.

[ Full content available at: https://github.com/apache/rocketmq/pull/470 ]
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