问题
what is the quickest way of finding the installation mode of the Hadoop 2.x?
I just want to learn the best way to find the mode when I login first time into a Hadoop installed machine.
回答1:
In hadoop 2 - go to /etc/hadoop/conf folder and check the Fs.defaultFS in core-site.xml and Yarn.resourcemanager.hostname property in yarn-site.xml. The values for those properties decide which mode you are running in.
Fs.defaultFS
Standalone mode - file:///
pseudo distributed- hdfs://localhost:8020/
Fully distributed - hdfs://namenodehostname:8020/
Yarn.resourcemanager.hostname
Standalone mode - file:///
pseudo distributed - hdfs://localhost:8021/
Fully ditributed - hdfs://resourcemanagerhostname:8021/
Alternatively you can use jps command to check the mode. if you see namenode/secondary namenode /jobtracker daemons running separately then it is distributed.
similarly in MR1 go to /etc/hadoop/conf folder and check the fs.default.name in core-site.xml and mapred.job.tracker property in mapred-site.xml.
来源：https://stackoverflow.com/questions/29721623/how-to-find-installation-mode-of-hadoop-2-x