Spark 中的 MapOutputTrackerMasterEndpoint 输出正在减慢我的工作速度。这是什么意思？

Question

我在我的 Spark 作业中得到了这个输出，它给我的作业增加了很多延迟。就在昨天，我在收到此消息后让作业运行了一夜，回家后发现没有任何其他处理。

16/01/08 18:51:36 INFO spark.MapOutputTrackerMaster: Size of output statuses for shuffle 0 is 930564 bytes
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.47:37232
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.44:55904
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.38:35491
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.43:60071
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.48:39267
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.39:44310
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.42:51390
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.32:36981
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.30:39261
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.34:58811
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.31:39829
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.40:45521
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.46:35892
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.33:35119
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.36:44486
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.37:35971
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.35:59625
16/01/08 18:51:36 INFO spark.MapOutputTrackerMasterEndpoint: Asked to send map output locations for shuffle 0 to 172.31.1.45:40861

我尝试用谷歌搜索它，但文档很少，我无法真正理解。有人知道吗？