sarthfrey commented on a change in pull request #27395: [SPARK-30667][CORE] Add
allGather method to BarrierTaskContext
URL: https://github.com/apache/spark/pull/27395#discussion_r379104351
##########
File path:
core/src/test/scala/org/apache/spark/scheduler/BarrierTaskContextSuite.scala
##########
@@ -52,6 +53,78 @@ class BarrierTaskContextSuite extends SparkFunSuite with
LocalSparkContext {
assert(times.max - times.min <= 1000)
}
+ test("share messages with allGather() call") {
+ val conf = new SparkConf()
+ .setMaster("local-cluster[4, 1, 1024]")
+ .setAppName("test-cluster")
+ sc = new SparkContext(conf)
+ val rdd = sc.makeRDD(1 to 10, 4)
+ val rdd2 = rdd.barrier().mapPartitions { it =>
+ val context = BarrierTaskContext.get()
+ // Sleep for a random time before global sync.
+ Thread.sleep(Random.nextInt(1000))
+ // Pass partitionId message in
+ val message = context.partitionId().toString
+ val messages = context.allGather(message)
+ messages.toList.iterator
+ }
+ // Take a sorted list of all the partitionId messages
+ val messages = rdd2.collect().head
+ // All the task partitionIds are shared
+ for((x, i) <- messages.view.zipWithIndex) assert(x == i.toString)
+ }
+
+ test("throw exception if we attempt to synchronize with different blocking
calls") {
Review comment:
cc @Ngone51 @jiangxb1987 @mengxr
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