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https://issues.apache.org/jira/browse/SPARK-25642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448272#comment-17448272
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Yongjun Zhang commented on SPARK-25642:
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Thanks [~pgandhi] .
What I observed is most of the time numRegisteredConnections is smaller than
numActiveConnections.
For example, in one case the gap can be as large as beyond 3k. while
numRegisteredConnections range between 0 - 2.5k, and
numActiveRegisteredConnections range between 0 - 3.6k.
Wonder if anyone else who look at these metrics have different observations.
> Add new Metrics in External Shuffle Service to help determine Network
> performance and Connection Handling capabilities of the Shuffle Service
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-25642
> URL: https://issues.apache.org/jira/browse/SPARK-25642
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, Spark Core
> Affects Versions: 2.4.0
> Reporter: Parth Gandhi
> Assignee: Parth Gandhi
> Priority: Minor
> Fix For: 3.0.0
>
>
> Recently, the ability to expose the metrics for YARN Shuffle Service was
> added as part of [SPARK-18364|[https://github.com/apache/spark/pull/22485]].
> We need to add some metrics to be able to determine the number of active
> connections as well as open connections to the external shuffle service to
> benchmark network and connection issues on large cluster environments.
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