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https://issues.apache.org/jira/browse/SPARK-8896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621564#comment-14621564
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Tathagata Das commented on SPARK-8896:
--------------------------------------
[~aniket] Its quite well documented. See "Points to Remember" in
http://spark.apache.org/docs/latest/streaming-programming-guide.html#initializing-streamingcontext
> StreamingSource should choose a unique name
> -------------------------------------------
>
> Key: SPARK-8896
> URL: https://issues.apache.org/jira/browse/SPARK-8896
> Project: Spark
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 1.4.0
> Reporter: Aniket Bhatnagar
>
> If 2 instances of StreamingContext are created and run using the same
> SparkContext, it results the following exception in the logs and causes the
> latter StreamingContext's metrics to go unreported.
> [ForkJoinPool-2-worker-7] [info] o.a.s.m.MetricsSystem -Metrics already
> registered
> java.lang.IllegalArgumentException: A metric named
> <AppName>.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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