[jira] [Assigned] (SPARK-35258) Enhance ESS ExternalBlockHandler with additional block rate-based metrics and histograms

["Apache Spark (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-35258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-35258:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>            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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