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https://issues.apache.org/jira/browse/ZOOKEEPER-4952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Li Wang updated ZOOKEEPER-4952:
-------------------------------
Affects Version/s: 3.9.3
3.9.2
3.8.4
3.9.1
3.8.3
3.8.2
3.9.0
3.8.0
> Reduce the GC overhead of Prometheus reject exception handling
> --------------------------------------------------------------
>
> Key: ZOOKEEPER-4952
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4952
> Project: ZooKeeper
> Issue Type: Improvement
> Components: metric system
> Affects Versions: 3.8.0, 3.9.0, 3.8.2, 3.8.3, 3.9.1, 3.8.4, 3.9.2, 3.9.3
> Reporter: Li Wang
> Priority: Critical
>
> The default RejectedExecutionHandler using by ThreadPoolExecutor is
> AbortPolicy. It has lots of GC overhead as it performs toString() on both
> Runnable object and exception object.
> This is to reduce the GC overhead by implementing a
> PrometheusRejectExceptionHandler to override the rejectedExecution() API.
> {code:java}
> public static class AbortPolicy implements RejectedExecutionHandler {
> /**
> * Creates an {@code AbortPolicy}.
> */
> public AbortPolicy() { }
> /**
> * Always throws RejectedExecutionException.
> *
> * @param r the runnable task requested to be executed
> * @param e the executor attempting to execute this task
> * @throws RejectedExecutionException always
> */
> public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {
> throw new RejectedExecutionException("Task " + r.toString() +
> " rejected from " +
> e.toString());
> }
> }
> {code}
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