Question:
I have installed Hadoop 2.7.0 on Ubuntu 14.04. start-dfs.sh,start-yarn.sh and start-all.sh files are in the sbin directory. But start-mapred.sh is not present in the directory. what might be the problem in my installation?
Solution:1
It is not a problem with your installation. Hadoop 2 uses YARN framework i.e. MapReduce 2.0 (MRv2).
Refer Hadoop Yarn for more details.
So, start-mapred.sh is not required. To start Hadoop, use start-all.sh or start-dfs.sh and start-yarn.sh.
YARN’s original purpose was to split up the two major responsibilities of the JobTracker/TaskTracker into separate entities:
- a global ResourceManager
- a per-application ApplicationMaster
- a per-node slave NodeManager
- a per-application Container running on a NodeManager
You might be following tutorials explaining Hadoop 1 setup.
Apache Hadoop Yarn will help you.
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