diff --git a/manifests/evaluator.pp b/manifests/evaluator.pp
index 1b2f9df0..9bf6eb68 100644
--- a/manifests/evaluator.pp
+++ b/manifests/evaluator.pp
@@ -13,6 +13,10 @@
 #    (optional) ensure state for package.
 #    Defaults to 'present'
 #
+#  [*workers*]
+#    (optional) Number of workers for evaluator service.
+#    Defaults to $::os_workers.
+#
 #  [*coordination_url*]
 #    (optional) The url to use for distributed group membership coordination.
 #    Defaults to undef.
@@ -25,6 +29,7 @@ class aodh::evaluator (
   $manage_service      = true,
   $enabled             = true,
   $package_ensure      = 'present',
+  $workers             = $::os_workers,
   $coordination_url    = undef,
   $evaluation_interval = $::os_service_default,
 ) {
@@ -32,9 +37,18 @@ class aodh::evaluator (
   include aodh::deps
   include aodh::params
 
+  if $coordination_url == undef and !is_service_default($workers) and $workers > 1 {
+    warning('coordination_url should be set to use multiple workers')
+    $workers_real = $::os_service_default
+  } else {
+    $workers_real = $workers
+  }
+
   aodh_config {
     'DEFAULT/evaluation_interval' : value => $evaluation_interval;
+    'evaluator/workers'           : value => $workers_real;
   }
+
   if $coordination_url {
     aodh_config {
       'coordination/backend_url' : value => $coordination_url;
diff --git a/manifests/listener.pp b/manifests/listener.pp
index 33be0ed1..d67ade3e 100644
--- a/manifests/listener.pp
+++ b/manifests/listener.pp
@@ -13,15 +13,24 @@
 #    (optional) ensure state for package.
 #    Defaults to 'present'
 #
+#  [*workers*]
+#    (optional) Number of workers for evaluator service.
+#    Defaults to $::os_workers.
+#
 class aodh::listener (
   $manage_service = true,
   $enabled        = true,
   $package_ensure = 'present',
+  $workers        = $::os_workers,
 ) {
 
   include aodh::deps
   include aodh::params
 
+  aodh_config {
+    'listener/workers': value => $workers
+  }
+
   ensure_resource( 'package', [$::aodh::params::listener_package_name],
     { ensure => $package_ensure,
       tag    => ['openstack', 'aodh-package'] }
diff --git a/manifests/notifier.pp b/manifests/notifier.pp
index 58a637f2..7075503e 100644
--- a/manifests/notifier.pp
+++ b/manifests/notifier.pp
@@ -13,15 +13,24 @@
 #    (optional) ensure state for package.
 #    Defaults to 'present'
 #
+#  [*workers*]
+#    (optional) Number of workers for notifier service.
+#    Defaults to $::os_workers.
+#
 class aodh::notifier (
   $manage_service = true,
   $enabled        = true,
   $package_ensure = 'present',
+  $workers        = $::os_workers,
 ) {
 
   include aodh::deps
   include aodh::params
 
+  aodh_config {
+    'notifier/workers': value => $workers;
+  }
+
   ensure_resource( 'package', [$::aodh::params::notifier_package_name],
     { ensure => $package_ensure,
       tag    => ['openstack', 'aodh-package'] }
diff --git a/releasenotes/notes/workers-054d3bafa34171d9.yaml b/releasenotes/notes/workers-054d3bafa34171d9.yaml
new file mode 100644
index 00000000..fbf07dc7
--- /dev/null
+++ b/releasenotes/notes/workers-054d3bafa34171d9.yaml
@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    The new parameters have been added to support workers option in each aodh
+    services.
+
+    - ``aodh::evaluator::workers``
+    - ``aodh::listener::workers``
+    - ``aodh::notifier::workers``
diff --git a/spec/classes/aodh_evaluator_spec.rb b/spec/classes/aodh_evaluator_spec.rb
index 55ca1e37..16f19fc5 100644
--- a/spec/classes/aodh_evaluator_spec.rb
+++ b/spec/classes/aodh_evaluator_spec.rb
@@ -21,14 +21,35 @@ describe 'aodh::evaluator' do
         is_expected.to contain_aodh_config('coordination/backend_url').with_value('redis://localhost:6379')
       end
 
+      it 'configures workers' do
+        is_expected.to contain_aodh_config('evaluator/workers').with_value(4)
+      end
+
       it 'installs python-redis package' do
         is_expected.to contain_package('python-redis').with(
           :name => platform_params[:redis_package_name],
-	  :tag  => 'openstack'
+          :tag  => 'openstack'
         )
       end
     end
 
+    context 'with coordination and workers' do
+      before do
+        params.merge!({
+          :coordination_url => 'redis://localhost:6379',
+          :workers          => 8,
+        })
+      end
+
+      it 'configures backend_url' do
+        is_expected.to contain_aodh_config('coordination/backend_url').with_value('redis://localhost:6379')
+      end
+
+      it 'configures workers' do
+        is_expected.to contain_aodh_config('evaluator/workers').with_value(8)
+      end
+    end
+
     context 'with evaluation interval' do
       before do
         params.merge!({ :evaluation_interval => '10' })
@@ -38,6 +59,14 @@ describe 'aodh::evaluator' do
       end
     end
 
+    context 'with workers' do
+      before do
+        params.merge!({ :workers => 8 })
+      end
+      it 'does not configure workers' do
+        is_expected.to contain_aodh_config('evaluator/workers').with_value('<SERVICE DEFAULT>')
+      end
+    end
 
     context 'when enabled' do
       it { is_expected.to contain_class('aodh::params') }
@@ -60,6 +89,10 @@ describe 'aodh::evaluator' do
         )
       end
 
+      it 'sets default values' do
+        is_expected.to contain_aodh_config('DEFAULT/evaluation_interval').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_aodh_config('evaluator/workers').with_value('<SERVICE DEFAULT>')
+      end
     end
 
     context 'when disabled' do
@@ -98,10 +131,7 @@ describe 'aodh::evaluator' do
   }).each do |os,facts|
     context "on #{os}" do
       let (:facts) do
-        facts.merge!(OSDefaults.get_facts({
-          :fqdn           => 'some.host.tld',
-          :concat_basedir => '/var/lib/puppet/concat'
-        }))
+        facts.merge!(OSDefaults.get_facts({ :os_workers => 4 }))
       end
 
       let(:platform_params) do
diff --git a/spec/classes/aodh_listener_spec.rb b/spec/classes/aodh_listener_spec.rb
index c0731b7b..84b4cc04 100644
--- a/spec/classes/aodh_listener_spec.rb
+++ b/spec/classes/aodh_listener_spec.rb
@@ -8,6 +8,16 @@ describe 'aodh::listener' do
 
   shared_examples_for 'aodh-listener' do
 
+    context 'with workers' do
+      let :params do
+        { :workers => 8 }
+      end
+
+      it 'configures workers' do
+        is_expected.to contain_aodh_config('listener/workers').with_value(8)
+      end
+    end
+
     context 'when enabled' do
       it { is_expected.to contain_class('aodh::params') }
 
@@ -29,6 +39,9 @@ describe 'aodh::listener' do
         )
       end
 
+      it 'sets default values' do
+        is_expected.to contain_aodh_config('listener/workers').with_value(4)
+      end
     end
 
     context 'when disabled' do
@@ -67,7 +80,7 @@ describe 'aodh::listener' do
   }).each do |os,facts|
     context "on #{os}" do
       let (:facts) do
-        facts.merge!(OSDefaults.get_facts())
+        facts.merge!(OSDefaults.get_facts({ :os_workers => 4 }))
       end
 
       let(:platform_params) do
diff --git a/spec/classes/aodh_notifier_spec.rb b/spec/classes/aodh_notifier_spec.rb
index 2ecb7161..b174e952 100644
--- a/spec/classes/aodh_notifier_spec.rb
+++ b/spec/classes/aodh_notifier_spec.rb
@@ -8,6 +8,16 @@ describe 'aodh::notifier' do
 
   shared_examples_for 'aodh-notifier' do
 
+    context 'with workers' do
+      let :params do
+        { :workers => 8 }
+      end
+
+      it 'configures workers' do
+        is_expected.to contain_aodh_config('notifier/workers').with_value(8)
+      end
+    end
+
     context 'when enabled' do
       it { is_expected.to contain_class('aodh::params') }
 
@@ -29,6 +39,9 @@ describe 'aodh::notifier' do
         )
       end
 
+      it 'sets default values' do
+        is_expected.to contain_aodh_config('notifier/workers').with_value(4)
+      end
     end
 
     context 'when disabled' do
@@ -67,7 +80,7 @@ describe 'aodh::notifier' do
   }).each do |os,facts|
     context "on #{os}" do
       let (:facts) do
-        facts.merge!(OSDefaults.get_facts())
+        facts.merge!(OSDefaults.get_facts({ :os_workers => 4 }))
       end
 
       let(:platform_params) do