Let's install Hadoop and other components such as NameNode, DataNode, MapReduce, secondary NameNode, and so on using the yum command available in RHEL distributions:
- Install the components using the following commands:
sudo yum clean all; sudo yum install hadoop-hdfs-namenode sudo yum install hadoop-hdfs-secondarynamenode sudo yum install hadoop-0.20-mapreduce-tasktrackerhadoop-hdfs-datanode sudo yum install hbase
- Verify whether these components installed successfully using the
rpm –qa<hadoop/hbase>command:You can start and stop the processes using the following commands:
/usr/lib/hadoop/bin/hadoop-daemon.sh<start/stop><daemon name> /usr/lib/hbase/bin/hbase-daemon.sh<start/stop><daemon name>
- Be careful of the sequence of starting and stopping HBase and Hadoop daemon processes.
If we use
start-all.sh,start-dfs.sh,start-mapred.sh, orstart-yarn.shto start the HBase/Hadoop cluster, it takes care of the sequence of starting and stopping the process. However, if we useHadoop-daemon.shorHBase-daemon.shto start Hadoop/HBase processes, we should follow the following sequence:- Hadoop startup process:
- Hadoop shutdown process:
- HBase startup process:
- HBase shutdown process:
- Hadoop startup process:
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