Aniket Bhatnagar created SPARK-8895:
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             Summary: MetricsSystem.removeSource not called in 
StreamingContext.stop
                 Key: SPARK-8895
                 URL: https://issues.apache.org/jira/browse/SPARK-8895
             Project: Spark
          Issue Type: Bug
          Components: Streaming
    Affects Versions: 1.4.0
            Reporter: Aniket Bhatnagar
            Priority: Minor


StreamingContext calls env.metricsSystem.registerSource during its construction 
but does not call env.metricsSystem.removeSource. Therefore, if a user attempts 
to restart a Streaming job in the same JVM by creating a new instance of 
StreamingContext with the same application name, it results in exceptions like 
the following in the log:

[info] o.a.s.m.MetricsSystem -Metrics already registered
java.lang.IllegalArgumentException: A metric named 
<>.StreamingMetrics.streaming.lastReceivedBatch_processingEndTime already exists
        at 
com.codahale.metrics.MetricRegistry.register(MetricRegistry.java:91)~[metrics-core-3.1.0.jar:3.1.0]
        at 
com.codahale.metrics.MetricRegistry.registerAll(MetricRegistry.java:385)~[metrics-core-3.1.0.jar:3.1.0]
        at 
com.codahale.metrics.MetricRegistry.register(MetricRegistry.java:85)~[metrics-core-3.1.0.jar:3.1.0]
        at 
org.apache.spark.metrics.MetricsSystem.registerSource(MetricsSystem.scala:148) 
~[spark-core_2.11-1.4.0.jar:1.4.0]
        at 
org.apache.spark.streaming.StreamingContext.<init>(StreamingContext.scala:199) 
[spark-streaming_2.11-1.4.0.jar:1.4.0]
        at 
org.apache.spark.streaming.StreamingContext.<init>(StreamingContext.scala:71) 
[spark-streaming_2.11-1.4.0.jar:1.4.0]




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