1.查看hadoop版本 [hadoop@ltt1 sbin]$ hadoop version Hadoop -cdh5.12.0 Subversion http://github.com/cloudera/hadoop -r dba647c5a8bc5e09b572d76a8d29481c78d1a0dd Compiled by jenkins on --29T11:33Z Compiled with protoc From source with checksum 7c45ae7a4592c