GHC Hadoop cluster information

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Last update: --Wcohen (talk) 15:08, 20 February 2015 (EST)

Domain names are ghc{26..46}.ghc.andrew.cmu.edu. You can log into any of these with your andrew credentials (I believe it's good form to not use ghc46, though, which also is the admin server). If you have permission problems logging in, email ugradlabs@cs.cmu.edu and cc wcohen@cs.cmu.edu. Also email ugradlabs if hadoop seems to be down: eg if basic commands like 'hadoop fs -ls' don't work.

For example, you might use 'ssh ghc34.ghc.andrew.cmu.edu' to log in. (Don't use port 8020, use the default ssh port).

The NameNode and Map/Reduce Admin. URLs:

Specs:

  • 25 nodes have 12 Intel Xeon cores @ 3.20GHZ, 12288KB cache. 12GB RAM.
  • 56 nodes have 4 Intel Xeon cores @ 2.67GHz, with 8192KB cache. Also 12GB RAM.

Anyone can log into these machines with their Andrew account. Registered 10-605 students will also have a HDFS home directory under their andrew id (eg, /user/wcohen). To use Hadoop you need a small amount of setup: below is a working .bashrc file. [Your default shell may or may not be bash - that's just what I use - W].

export PATH=$PATH:/usr/local/hadoop/bin:/usr/local/pig-0.12.0/bin
export JAVA_HOME=/usr/lib/jvm/jre-sun
export CLASSPATH=`ls -1 /usr/local/hadoop/*.jar|perl -ne 'do{chop;print $sep,$_;$sep=":";}'`

Some students have reported problems with this setup: If you type 'which hadoop' this should resolve to /usr/local/hadoop-1.2.1/bin/hadoop., and it doesn't you may need to tweak the path appropriately.--Wcohen (talk) 15:08, 20 February 2015 (EST)

You only need to add the directory /usr/local/pig-0.12.0/bin to your PATH if you want to use PIG.

We recommend running some simple job very soon to verify your setup (and also make sure that the permissions and access for your account are set properly). For instance, to copy a sharded version of the rcv1 data from William's HDFS account to yours:

hadoop jar /usr/local/hadoop/contrib/streaming/hadoop-streaming-1.2.1.jar \
-mapper cat -reducer cat -numReduceTasks 10 -input /user/wcohen/rcv1/small/sharded -output tmp-output