This is a simple set of bash functions for manipulating a Amazon Elastic MapReduce clusters.

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You must install the AWS Command Line Interface.

You then must setup an emr_defaults.json file with your default emrsettings. Use the emr_defaults_sample.json as a starting point.

export EMR_DEFAULTS_JSON=/<mypath>/bash-emr/bash-emr/emr_defaults.json

. /<mypath>/bash-emr/setenv.sh

Finally, you must source the setenv.sh file (in your .bash_profile)

. setenv.sh

To find an existing cluster:

emrlist

To attach to a cluster, using a flow id:

emrset <flow id>	

To get the current flow id:

emrset

To remotely login to the master node of the current flow id:

emrlogin

To remotely login with just the ip address:

emrlogin <ip address>	

Note that most commands will take the cluster id or an ip address to override the default cluster id set using emrset.

This is shorthand for calling from the shell.

emr <some args>

When you start a flow on EMR, you will be given a flow id. Use emrset to set the flow id for use by many of the other commands

emrset <flow id>

Calling emrset without the id returns the current flow id.

Will return the list of recent clusters

Will return the list of clusters that in an active state

Will return the current master node on the EMR cluster.

Will remotely login to the master node.

Will return the current status of a given running flow.

Will terminate your remote EMR cluster.

Will launch screen on the master node. Screen must be already installed. If a screen instance is already running, this command will automatically attach.

Will automatically 'tail' the current flow step logs.

emrtail 2

Without a step number, a list of available steps will be displayed.

Will create a local SOCKS proxy to the master node. This is useful for accessing the JobTracker and NameNode. You must install FoxyProxy in FireFox for this to work best.

Will scp a given file to the remote master node.

emrscp my-hadoop-app.jar

This is useful if you leave your EMR cluster running and want to manually spawn jobs from emrlogin or emrscreen.

Will copy the given file or folder from the remote master node to a local path

emrscplocal file.on.master.txt ~/myfolder/

Will scp all conf/*-site.xml files from the master node into the given directory.

emrconf local-conf

This is useful if you leave your EMR cluster running on a AWS VPC and wish to run Hadoop jobs from a local shell.