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https://issues.apache.org/jira/browse/HADOOP-4585?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tom White resolved HADOOP-4585.
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Resolution: Won't Fix
This was fixed in HADOOP-4117
> unused and misleading configuration in hadoop-init
> --------------------------------------------------
>
> Key: HADOOP-4585
> URL: https://issues.apache.org/jira/browse/HADOOP-4585
> Project: Hadoop Core
> Issue Type: Improvement
> Components: contrib/ec2
> Affects Versions: 0.18.1
> Reporter: Karl Anderson
> Priority: Minor
>
> src/contrib/ec2/bin/image/hadoop-init is appended to rc.local on all
> ec2 cluster boxes. This shell script generates the hadoop-site.xml
> configuration file. It starts with some default settings, which are
> used to populate the file. These defaults are then overwritten by the
> user data (from hadoop-ec2-env.sh) passed to the EC2 instance by
> launch-hadoop-master and launch-hadoop-slaves.
> This isn't a bug; setting variables in hadoop-ec2-env.sh does the
> right thing. However, it's dead and misleading code (well, it misled
> me) and running a test Hadoop job to figure out what's going on takes
> a little effort.
> Suggested change to hadoop-init:
> Remove these lines:
> {noformat}
> # set defaults
> MAX_TASKS=3
> [ "$INSTANCE_TYPE" == "m1.large" ] && MAX_TASKS=6
> [ "$INSTANCE_TYPE" == "m1.xlarge" ] && MAX_TASKS=12
> MAX_MAP_TASKS=$MAX_TASKS
> MAX_REDUCE_TASKS=$MAX_TASKS
> {noformat}
> Add a comment before the lines which access the user data:
> {noformat}
> # get user data passed in by the ec2 instance launch
> wget -q -O - http://169.254.169.254/latest/user-data | tr ',' '\n' >
> /tmp/user-data
> source /tmp/user-data
> {noformat}
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