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https://issues.apache.org/jira/browse/HADOOP-19905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18093126#comment-18093126
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ASF GitHub Bot commented on HADOOP-19905:
-----------------------------------------
Hexiaoqiao commented on PR #8520:
URL: https://github.com/apache/hadoop/pull/8520#issuecomment-4862306975
Committed to trunk. Thanks @magnuma3 and @K0K0V0K .
> Implement HttpServer2 thread pool metrics
> -----------------------------------------
>
> Key: HADOOP-19905
> URL: https://issues.apache.org/jira/browse/HADOOP-19905
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: KWON BYUNGCHANG
> Priority: Major
> Labels: pull-request-available
>
> HttpServer2Metrics (HADOOP-17133) exposes only StatisticsHandler
> counters. It says nothing about the Jetty thread pool, so
> administrators have no metric-level visibility into thread pool
> saturation.
>
> This patch adds gauges to HttpServer2Metrics:
>
> * Pool: maxThreads, minThreads, threads, idleThreads, busyThreads, queueSize
> * Per role (summed over connectors): acceptorThreads, selectorThreads
> * Worker only (pool count minus acceptors and selectors):
> maxWorkerThreads, workerThreads, busyWorkerThreads
>
> The worker-only gauges are exposed separately because acceptor and
> selector threads sit in blocking accept()/select() loops and never go
> idle;
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