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https://www.cloudera.com/content/www/en-us/documentation/cdh/5-1-x/Impala/Installing-and-Using-Impala/ciiu_resource_management.html#rm_cdh_prereqs_unique_2
points to
http://www.cloudera.com/content/cloudera-content/cloudera-docs/CDH5/latest/CDH5-Installation-Guide/cdh5ig_llama_installation.html
which sends me to
http://www.cloudera.com/content/www/en-us/documentation/enterprise/latest/topics/cdh_ig_llama_installation.html
which is 404.