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https://issues.apache.org/jira/browse/FLINK-1550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15344345#comment-15344345
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ASF GitHub Bot commented on FLINK-1550:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2146#discussion_r68058143
--- Diff:
flink-runtime/src/main/scala/org/apache/flink/runtime/jobmanager/JobManager.scala
---
@@ -149,6 +154,9 @@ class JobManager(
var leaderSessionID: Option[UUID] = None
+ private var metricsRegistry : FlinkMetricRegistry = _
+ private var jobManagerMetricGroup : JobManagerMetricGroup = _
--- End diff --
`null` values are discouraged in Scala. Better use
`Option[FlinkMetricRegistry]` which you initialize with `None`.
> Show JVM Metrics for JobManager
> -------------------------------
>
> Key: FLINK-1550
> URL: https://issues.apache.org/jira/browse/FLINK-1550
> Project: Flink
> Issue Type: Sub-task
> Components: JobManager, Metrics
> Reporter: Robert Metzger
> Assignee: Chesnay Schepler
> Fix For: pre-apache
>
>
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