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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/04/28 18:34:00 UTC
[jira] [Commented] (SPARK-35258) Enhance ESS ExternalBlockHandler
with additional block rate-based metrics and histograms
[ https://issues.apache.org/jira/browse/SPARK-35258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17334929#comment-17334929 ]
Apache Spark commented on SPARK-35258:
--------------------------------------
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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