closing connection java.nio.channels.ClosedChannelException

ERROR TransportRequestHandler:293 - Error sending result StreamResponse{streamId=/jars/mysql-connector-java-8.0.14.jar, byteCount=2134907, body=FileSegmentManagedBuffer{file=/root/hd/apache-hive-2.3.4-bin/lib/mysql-connector-java-8.0.14.jar, offset=0, length=2134907}} to /47.93.32.35:58270; closing connection java.nio.channels.ClosedChannelException at io.netty.channel.AbstractChannel$AbstractUnsafe.close(...)(Unknown Source) 问题解决：分配资源超过了机器物理硬件大小 运行spark job该分配多少资源，即我们该分配多少个executor？每个executor分配多少内存、多少个core？