dasahcc commented on issue #327: Change the way Helix triggers rebalance in purgeExpiredJobs URL: https://github.com/apache/helix/issues/327#issuecomment-510685974 There is a race condition if user update the ResourceConfig at same time. Say original p1 has preference list: [1, 2, 3]. Helix read this ResourceConfig back and try to write to ZK. But at the moment the user override the p1 preference list to [4, 5, 6]. Helix will fail to update the ResourceConfig and merge it with [4, 5, 6]. So the final preference list for p1 will be [1, 2, 3, 4, 5, 6]. So anyway we should fix the issue moving away from touching ZK.
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