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https://issues.apache.org/jira/browse/SPARK-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14224177#comment-14224177
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Saisai Shao commented on SPARK-4595:
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Hi Josh, I think this bug may probably be introduced by {{6aa08c3 [SPARK-1386]
Web UI for Spark Streaming}}, this is not a 1.2.0 new bug.
> 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
> Priority: Blocker
>
> 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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