Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1947#issuecomment-217213101
Is it possible that submitting the same job two times doesn't work?
```
./bin/flink run ./examples/streaming/SocketWindowWordCount.jar --port 54323
05/05/2016 19:09:08 Job execution switched to status RUNNING.
05/05/2016 19:09:08 Source: Socket Stream -> Flat Map(1/1) switched to
SCHEDULED
05/05/2016 19:09:08 Source: Socket Stream -> Flat Map(1/1) switched to
DEPLOYING
05/05/2016 19:09:08 Fast SlidingProcessingTimeWindows(5000, 1000) of
WindowedStream.main(SocketWindowWordCount.java:79) -> Sink: Unnamed(1/1)
switched to SCHEDULED
05/05/2016 19:09:08 Fast SlidingProcessingTimeWindows(5000, 1000) of
WindowedStream.main(SocketWindowWordCount.java:79) -> Sink: Unnamed(1/1)
switched to DEPLOYING
05/05/2016 19:09:08 Source: Socket Stream -> Flat Map(1/1) switched to
RUNNING
05/05/2016 19:09:08 Source: Socket Stream -> Flat Map(1/1) switched to
FAILED
java.lang.IllegalArgumentException: This group ([key0, localhost, Actor,
TaskManager, TaskManager, 964566cfcf032710aff86614010fce21, Category, Tasks,
Job, "Socket Window WordCount", Operator, Flat Map, SubTask, 0, ChannelType,
OutputChannel, Index, 0]) already contains a metric named numBytesOut
at org.apache.flink.metrics.MetricGroup.addMetric(MetricGroup.java:246)
at org.apache.flink.metrics.MetricGroup.counter(MetricGroup.java:123)
at
org.apache.flink.runtime.io.network.api.serialization.SpanningRecordSerializer.setMetrics(SpanningRecordSerializer.java:206)
at
org.apache.flink.runtime.io.network.api.writer.RecordWriter.setMetrics(RecordWriter.java:216)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.createStreamOutput(OperatorChain.java:294)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.<init>(OperatorChain.java:94)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:188)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584)
at java.lang.Thread.run(Thread.java:745)
05/05/2016 19:09:08 Fast SlidingProcessingTimeWindows(5000, 1000) of
WindowedStream.main(SocketWindowWordCount.java:79) -> Sink: Unnamed(1/1)
switched to RUNNING
05/05/2016 19:09:08 Job execution switched to status FAILING.
```
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