Github user falaki commented on a diff in the pull request:
https://github.com/apache/spark/pull/15471#discussion_r85230441
--- Diff: core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala
---
@@ -83,7 +86,29 @@ private[r] class RBackendHandler(server: RBackend)
writeString(dos, s"Error: unknown method $methodName")
}
} else {
+ // To avoid timeouts when reading results in SparkR driver, we will
be regularly sending
+ // heartbeat responses. We use special code +1 to signal the client
that backend is
+ // alive and it should continue blocking for result.
+ val execService =
ThreadUtils.newDaemonSingleThreadScheduledExecutor("SparkRKeepAliveThread")
--- End diff --
I was not sure about this either. I used this method based on advice from
@zsxwing.
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