How to separate Hadoop MapReduce from HDFS? -


i'm curious if separate hdfs filesystem mapreduce framework. know main point of hadoop run maps , reduces on machines data in question, wondering if change *.xml files change configuration of machine jobtracker, namenode , datanodes running on.

currently, configuration 2 vms setup: 1 (the master) namenode, datanode, jobtracker, tasktracker (and secondarynamenode), other (the slave) datanode, tasktraker. essentially, want change have master namenode datanode(s), jobtracker, , have slave tasktracker perform computations (and later on, have more slaves tasktrackers on them; 1 on each). bottleneck data transfer between 2 vms computations of maps , reduces, since data @ stage small i'm not concerned it. know if configuration possible, , how it. tips?

thanks!

you don't specify kind of options in configuration files. have take care of kind of deamons start on each machine(you call them vms think mean machines).

i suppose start using start-all.sh script can find in bin directory under hadoop installation dir.

if take @ script see call number of sub-scripts corresponding starting datanodes, tasktrackers , namenode, jobtracker.

in order achive you've said, this:

  1. modify masters , slaves files this: master file should contain name of machine1 slaves should contain name of machine2

  2. run start-mapred.sh

  3. modify masters , slaves files this: master file should contain machine1 slaves file should contain machine1

  4. run start-dfs.sh

i have tell i've never tried such configuration i'm not sure going work can give try. anyway solution in direction!


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