LuciferYang commented on a change in pull request #33852:
URL: https://github.com/apache/spark/pull/33852#discussion_r699923891
##########
File path: core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala
##########
@@ -165,7 +165,7 @@ private[r] class RBackendHandler(server: RBackend)
// Write status bit
writeInt(dos, 0)
- writeObject(dos, ret.asInstanceOf[AnyRef], server.jvmObjectTracker)
Review comment:
I found that `master` has same problem
run
```
build/mvn clean install -Phive -Pscala-2.13 -pl core -am
```
or
```
build/mvn clean install -Phive -Pscala-2.13 -pl core -am -Dtest=none
-DwildcardSuites=org.apache.spark.SparkContextSuite
```
Some cases may fail because of `Only one SparkContext should be running in
this JVM (see SPARK-2243).The currently running SparkContext was created at` or
`java.lang.IllegalStateException: Cannot call methods on a stopped SparkContext.
This stopped SparkContext was created at`, but which case fails has a
certain randomness
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