Github user ted-yu commented on the pull request:
https://github.com/apache/spark/pull/11082#issuecomment-180498087
I am trying to add an Array to ConcurrentLinkedQueue (collectedData) in
Scala 2.11:
```
stream.foreachRDD { rdd => Collections.addAll(collectedData, rdd.collect())
}
```
I got the following compilation error:
```
[error] found : java.util.concurrent.ConcurrentLinkedQueue[(String,
String)]
[error] required: java.util.Collection[_ >: java.io.Serializable]
[error] Note: (String, String) <: Any, but Java-defined trait Collection is
invariant in type E.
[error] You may wish to investigate a wildcard type such as `_ <: Any`.
(SLS 3.2.10)
[error] stream.foreachRDD { rdd => Collections.addAll(allReceived,
rdd.collect()) }
```
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