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https://issues.apache.org/jira/browse/SPARK-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250432#comment-14250432
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Josh Rosen commented on SPARK-4595:
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It looks like this bug was introduced in
https://github.com/apache/spark/pull/2432, which moved the
{{MetricsSystem.start()}} call from SparkEnv to SparkContext, which allowed it
to take place after the web UI had started. That patch addressed SPARK-3377
and the fix was only applied to 1.2.0, so this looks like a 1.2.0 regression.
> Spark MetricsServlet is not worked because of initialization ordering
> ---------------------------------------------------------------------
>
> Key: SPARK-4595
> URL: https://issues.apache.org/jira/browse/SPARK-4595
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.2.0
> Reporter: Saisai Shao
> Assignee: Saisai Shao
> Priority: Blocker
> Fix For: 1.3.0, 1.2.1
>
>
> Web UI is initialized before MetricsSystem is started, at that time
> MetricsSerlvet is not yet created, which will make MetricsServlet fail to
> register into web UI.
> Instead MetricsServlet handler should be added to the web UI after
> MetricsSystem is started.
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