minghai
Reputation: 13
We all know that hadoop 3.x MapReduce needs HADOOP_MAPRED_HOME in the mapred-site.xml, why does haoop 2.x not need HADOOP_MAPRED_HOME? Why?
In other words, where are the changes to HADOOP_MAPRED_HOME in hadoop 3.x?
I could not find it myself!
Upvotes: 1
Views: 191
Answers (1)
OneCricketeer
Reputation: 191963
Hadoop 3 refactored the environment variables.
Hadoop 2 still had the variable, by the way, but it may have had a reasonable default
Upvotes: 1
Related Questions
- Differnce between Hadoop 1 and Hadoop 2
- Hadoop 2.2 and Maven
- Purpose of Hadoop MapReduce
- mapred-site.xml on the client machine has to be the same as the one in the hadoop cluster?
- Hadoop release version confusing
- Hadoop Versions seem to fall under 0.x, 1.x, and 2.x, but when discussing YARN/MapReduce, every page Refers to Hadoop 1 and Hadoop 2.0
- Hadoop 2.2.0 Configuration deprecation
- Why 'mapred-site.xml' is not included in the latest Hadoop 2.2.0?
- incompatibility of hadoop versions
- Are $HADOOP_COMMON_HOME and $HADOOP_HDFS_HOME the same value?