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Step-1. Click on stop-all.sh and then click on start-all.sh OR

Step-2. Write sudo hdfs (press enter), su-hdfs (press enter), /etc/init.d/ha (press enter) and then /etc/init.d/hadoop-0.20-namenode start (press enter).

Which are the three modes in which Hadoop can be run?

The three modes in which Hadoop can be run are -

standalone (local) mode

Pseudo-distributed mode

Fully distributed mode

What does /etc /init.d do?

/etc /init.d specifies where daemons (services) are placed or to see the status of these daemons. It is very LINUX specific, and nothing to do with Hadoop.

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