1.Spark与Hadoop是什么关系? 答: Spark是一个兼容Hadoop数据的快速的一般处理引擎。它可以通过Yarn框架或者Spark的独立模式运行于Hadoop集群上。同时,它也可以处理HDFS、Hbase、Cassandra、Hive以及其它任何Hadoop输入格式的数据。为了解决复杂的批数据处理(batch data processing),基于历史的交互式查询(interacti
Origins What is the purpose of the project? What is the history of the project? What’s the origin of the gopher mascot? Is the language called Go or Golang? Why did you create a new language? Wh
问题 [root@localhost hadoop]# start-dfs.shStarting namenodes on [node21]ERROR: Attempting to operate on hdfs namenode as rootERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.St