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Posted to common-issues@hadoop.apache.org by "Akira Ajisaka (Jira)" <ji...@apache.org> on 2021/09/09 08:14:00 UTC
[jira] [Assigned] (HADOOP-17804) Prometheus metrics only include
the last set of labels
[ https://issues.apache.org/jira/browse/HADOOP-17804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Akira Ajisaka reassigned HADOOP-17804:
--------------------------------------
Assignee: Adam Binford
> Prometheus metrics only include the last set of labels
> ------------------------------------------------------
>
> Key: HADOOP-17804
> URL: https://issues.apache.org/jira/browse/HADOOP-17804
> Project: Hadoop Common
> Issue Type: Bug
> Components: common
> Affects Versions: 3.3.1
> Reporter: Adam Binford
> Assignee: Adam Binford
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.2
>
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> A prometheus endpoint was added in https://issues.apache.org/jira/browse/HADOOP-16398, but the logic that puts them into a map based on the "key" incorrectly hides any metrics with the same key but different labels. The relevant code is here: [https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/sink/PrometheusMetricsSink.java#L55|https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/sink/PrometheusMetricsSink.java#L55.]
> The labels/tags need to be taken into account, as different tags mean different metrics. For example, I came across this while trying to scrape metrics for all the queues in our scheduler. Only the last queue is included because all the metrics have the same "key" but a different "queue" label/tag.
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