Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/3849#discussion_r22830201 --- Diff: core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerBackend.scala --- @@ -290,13 +291,22 @@ private[spark] class MesosSchedulerBackend( .setType(Value.Type.SCALAR) .setScalar(Value.Scalar.newBuilder().setValue(scheduler.CPUS_PER_TASK).build()) .build() + // Encode the attemptId as part of the data payload, since there's not a MesosTaskInfo field + // to hold it: + val data: ByteString = { + val serializedTask = task.serializedTask + val dataBuffer = ByteBuffer.allocate(4 + serializedTask.limit()) + dataBuffer.putInt(task.attemptNumber) + dataBuffer.put(serializedTask) --- End diff -- That's a good idea; putting the serialization / deserialization code in the same wrapper class will make it much easier to verify that it's correct / test it separately. I'll push a new commit to do this.
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