GitHub user dbtsai opened a pull request:
https://github.com/apache/spark/pull/22229
[MINOR] Fix Scala 2.12 build
## What changes were proposed in this pull request?
[SPARK-25095](https://github.com/apache/spark/commit/ad45299d047c10472fd3a86103930fe7c54a4cf1)
introduced `ambiguous reference to overloaded definition`
```
[error]
/Users/d_tsai/dev/apache-spark/core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala:242:
ambiguous reference to overloaded definition,
[error] both method addTaskCompletionListener in class TaskContext of type
[U](f: org.apache.spark.TaskContext => U)org.apache.spark.TaskContext
[error] and method addTaskCompletionListener in class TaskContext of type
(listener:
org.apache.spark.util.TaskCompletionListener)org.apache.spark.TaskContext
[error] match argument types (org.apache.spark.TaskContext => Unit)
[error] context.addTaskCompletionListener(_ => server.close())
[error] ^
[error] one error found
[error] Compile failed at Aug 24, 2018 1:56:06 PM [31.582s]
```
which fails the Scala 2.12 branch build.
## How was this patch tested?
Existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dbtsai/spark fix-2.12-build
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22229.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #22229
----
commit 20a2aa21813cbbb131110e00d2e5c1426d6dae78
Author: DB Tsai <d_tsai@...>
Date: 2018-08-24T21:22:54Z
fix 2.12 build
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