jiajunwang opened a new issue #940: Full auto rebalancer with CrushEd algorithm 
changed partition assignment unexpected.
URL: https://github.com/apache/helix/issues/940
 
 
   It was reported and verified that the current full auto rebalancer with 
CrushEd strategy may change partition assignment if the rebalance is triggered 
rapidly (2 or 3 times per second). This caused unexpected partition shuffling.
   
   Till now, based on our investigation, the problem might be related to the 
unstable map key iterator in Java 8 or after. Since this usually happens with a 
short while, it might be overlooked since we bump up JDK version.
   
   We plan to fix it while ensuring the algorithm's backward compatibility.

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