i3wangyi commented on issue #367: Add transient cache for CustomRestClient 
implementation
URL: https://github.com/apache/helix/pull/367#issuecomment-518397174
 
 
   > The parallel request still need to be considered. Say you are implementing 
the locking by keys. We need 100 participants partition level status called 
from single instance health check. Then you will read one instance partition 
level status after the other. It is still sequential read.
   
   The sequential read comes from how the upper class uses the 
CustomRestClientImpl. Currently, it is sequential but it's the scope of next 
PR. In this PR, my purpose is to add the cache implementation so we can change 
the implementation of the upper class (ServiceImpl) and make it parallel.

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