WeichenXu123 commented on pull request #28584:
URL: https://github.com/apache/spark/pull/28584#issuecomment-631859882
Also fix this test like:
```
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 4, 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: String = context.partitionId().toString
val messages: Array[String] = context.allGather(message)
Iterator.single(messages.toList)
}
// Take a sorted list of all the partitionId messages
val messages_list = rdd2.collect()
assert (messages_list.length === 4)
for (messages <- messages_list) {
assert (messages === (0 until 4).map(_.toString).toList)
}
}
```
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