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The "topology_rack_awareness_scripts" page has been changed by EdwardCapriolo.
http://wiki.apache.org/hadoop/topology_rack_awareness_scripts
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New page:
== Topology Scripts ==
Topology scripts are used by hadoop to determine the rack location of nodes. This information
is used by hadoop to replicate block data to redundant racks.
Here is a sample script that uses a separate data file.
== Sample 1: Script with datafile ==
=== Topology Script ===
{{{
HADOOP_CONF=/etc/hadoop/conf while [ $# -gt 0 ] ; do
. nodeArg=$1
exec< ${HADOOP_CONF}/topology.data result="" while read line ; do
. ar=( $line ) if [ "${ar[0]}" = "$nodeArg" ] ; then
. result="${ar[1]}"
fi
done shift if [ -z "$result" ] ; then
. echo -n "/default-rack "
else
. echo -n "$result "
fi
done
}}}
=== Topology data ===
{{{
hadoopdata1.ec.com /dc1/rack1
hadoopdata1 /dc1/rack1
10.1.1.1 /dc1/rack1
}}}
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