[Performance] Remove cfn-hup from compute nodes as a temporary mitigation to restore good performance.

Running cfn-hup on compute nodes can cause a major performance degradation on large clusters.

This change will be vended as a custom cookbook to mitigate the performance degradation.

Side effect of this change is that cluster updates will not be supported.

Author: gmarciani

cookbooks/aws-parallelcluster-platform/spec/unit/recipes/supervisord_config_spec.rb

@@ -70,7 +70,6 @@
 
         it 'has the correct content' do
           is_expected.to render_file('/etc/parallelcluster/parallelcluster_supervisord.conf')
-            .with_content("[program:cfn-hup]")
             .with_content("[program:computemgtd]")
 
           is_expected.not_to render_file('/etc/parallelcluster/parallelcluster_supervisord.conf')

cookbooks/aws-parallelcluster-platform/templates/supervisord/parallelcluster_supervisord.conf.erb

@@ -2,7 +2,7 @@
 # Local modifications could be overwritten.
 <%# HeadNode, ComputeFleet, LoginNode -%>
 <% case node['cluster']['node_type'] -%>
-<% when 'HeadNode', 'ComputeFleet', 'LoginNode' -%>
+<% when 'HeadNode', 'LoginNode' -%>
 [program:cfn-hup]
 command = <%= node['cluster']['scripts_dir']%>/cfn-hup-runner.sh
 autorestart = true