colinmjj commented on issue #25759: [SPARK-19147][CORE] netty throw NPE URL: https://github.com/apache/spark/pull/25759#issuecomment-530633191 Here is the scene, when the executor is killed before shuffle process, but the task was created and ready to fetch blocks. Then, the NPE will occur if task try to create a new client. Such NPE will confuse user to find why executor is killed.
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