[BUILD] Randomize JVM heapsize between 512 and 1024m

dev-tools/build_randomization.rb

@@ -57,6 +57,7 @@ RANDOM_CHOICES = {
 
   # bug forced to be false for now :test_nightly => { :method => :true_or_false},
   'tests.nightly' => {:selections => false},
+  'tests.heap.size' => {:choices => [512, 1024], :method => :random_heap},
   'tests.assertion.disabled'=> {:choices => 'org.elasticsearch', :method => 'get_10_percent'},
   'tests.security.manager' => {:choices => [true, false], :method => 'get_90_percent'},
 }
@@ -94,6 +95,11 @@ class Randomizer
     [true, false][rand(2)]
   end
 
+  def random_heap
+    inner_data_array = [data_array[0], data_array[1], data_array[0] + rand(data_array[1] - data_array[0])]
+    "%sm" % inner_data_array[rand(inner_data_array.size)]
+  end
+
   def get_random_with_distribution(mdata_array, distribution)
     L.debug "randomized distribution data %s" % YAML.dump(mdata_array)
     L.debug "randomized distribution distribution %s" % YAML.dump(distribution)
@@ -288,9 +294,10 @@ class RandomizedRunner
     desc = {}
 
     # TODO: better error handling
-    desc[:BUILD_DESC] = "%s,%s,%s%s%s%s" % [
+    desc[:BUILD_DESC] = "%s,%s,heap[%s],%s%s%s%s" % [
                                             File.basename(j[:JAVA_HOME]),
                                             s['es.node.mode'],
+                                            s['tests.heap.size'],
                                             s['tests.nightly'] ? 'nightly,':'',
                                             s['tests.jvm.argline'].gsub(/-XX:/,''),
                                             s.has_key?('tests.assertion.disabled')? ',assert off' : '',