li4wang opened a new pull request, #2279:
URL: https://github.com/apache/zookeeper/pull/2279

   Implemented `PrometheusRejectedExecutionHandler` and override the 
`rejectedExecution()` API to fix the large memory footprint and long GC pause 
of RejectedExecutionException handler.  No more RejectedExecutionException() 
will be thrown.
   
   This enhancement increased read throughput by 140% based on perf comparison 
test result.


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