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https://issues.apache.org/jira/browse/SPARK-35258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17334929#comment-17334929
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Apache Spark commented on SPARK-35258:
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User 'xkrogen' has created a pull request for this issue:
https://github.com/apache/spark/pull/32388
> Enhance ESS ExternalBlockHandler with additional block rate-based metrics and
> histograms
> ----------------------------------------------------------------------------------------
>
> Key: SPARK-35258
> URL: https://issues.apache.org/jira/browse/SPARK-35258
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, YARN
> Affects Versions: 3.1.1
> Reporter: Erik Krogen
> Priority: Major
>
> Today the {{ExternalBlockHandler}} component of ESS exposes some useful
> metrics, but is lacking around metrics for the rate of block transfers. We
> have {{blockTransferRateBytes}} to tell us the rate of _bytes_, but no metric
> to tell us the rate of _blocks_, which is especially relevant when running
> the ESS on HDDs that are sensitive to random reads. Many small block
> transfers can have a negative impact on performance, but won't show up as a
> spike in {{blockTransferRateBytes}} since the sizes are small.
> We can also enhance {{YarnShuffleServiceMetrics}} to expose histogram-style
> metrics from the {{Timer}} instances within {{ExternalBlockHandler}} -- today
> it is only exposing the count and rate, but not timing information from the
> {{Snapshot}}.
> These two changes can make it easier to monitor the health of the ESS.
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