Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/6205#issuecomment-115119854
As per the comment here:
https://github.com/scala/scala/blob/2dcc4c42fdcefee08add9dbdcf619ab5da745674/src/compiler/scala/tools/nsc/typechecker/Typers.scala#L3329
One way to prevent from this issue is removing the overload `def
askWithRetry[T: ClassTag](message: Any)` and using the default parameter: `def
askWithRetry[T: ClassTag](message: Any, timeout: RpcTimeout =
defaultAskTimeout)`.
I just tried this locally and the compiler reported the following error:
```
[error]
/Users/zsx/workspace/spark/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala:189:
type mismatch;
[error] found : scala.concurrent.duration.FiniteDuration
[error] required: org.apache.spark.rpc.RpcTimeout
[error] BlockManagerHeartbeat(blockManagerId), 600 seconds)
```
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