IO threads are used in a imbalance
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Descripción
In my program, I use 16 eventbases, chosen by Round-robin.
During its working, i find that IOThread usage is very imbalance: 16 IO threads, some CPU usage reach to 98%+(1 threads exactly), while other only use 20%~, which caused a long tail latency.
Here my question is why IO threads are so imbalance?
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