Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/21898#discussion_r207444701
--- Diff: core/src/main/scala/org/apache/spark/BarrierTaskContext.scala ---
@@ -39,6 +44,17 @@ class BarrierTaskContext(
extends TaskContextImpl(stageId, stageAttemptNumber, partitionId,
taskAttemptId, attemptNumber,
taskMemoryManager, localProperties, metricsSystem, taskMetrics) {
+ private val barrierCoordinator: RpcEndpointRef = {
+ val env = SparkEnv.get
+ RpcUtils.makeDriverRef("barrierSync", env.conf, env.rpcEnv)
--- End diff --
It would be nice to define `"barrierSync"` as a constant.
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