.. This work is licensed under a
.. Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0

.. _apex-s3p-label:

.. toctree::
   :maxdepth: 2

Policy APEX PDP component
~~~~~~~~~~~~~~~~~~~~~~~~~

Setting up Stability Tests in APEX
++++++++++++++++++++++++++++++++++

Introduction
------------

The 72 hour Stability Test for apex-pdp has the goal of introducing a steady flow of transactions initiated from a test client server running JMeter. The pdp is configured to start a rest server inside it and take input from rest clients (JMeter) and send back output to the rest clients (JMeter).

The input events will be submitted through rest interface of apex-pdp and the results are verified using the rest responses coming out from apex-pdp.

The test will be performed in a multi-threaded environment where 20 threads running in JMeter will keep sending events to apex-pdp in every 500 milliseconds for the duration of 72 hours.

Setup details
-------------

The stability test is performed on VM's running in OpenStack cloud environment. There are 2 seperate VM's, one for running apex pdp & other one for running JMeter to simulate steady flow of transactions.

**OpenStack environment details**

Version: Mitaka

**apex-pdp VM details**

OS:Ubuntu 16.04.5 LTS

CPU: 4 core

RAM: 4 GB

HardDisk: 40 GB

Docker Version: 18.06.1-ce, build e68fc7a

Java: openjdk version "1.8.0_181"

**JMeter VM details**

OS: Ubuntu 16.04.3 LTS

CPU: 4 core

RAM: 4 GB

HardDisk: 40 GB

Java: openjdk version "1.8.0_181"

JMeter: 5.1.1

Install JMeter in virtual machine
---------------------------------

Make the etc/hosts entries

.. code-block:: bash
    
    echo $(hostname -I | cut -d\  -f1) $(hostname) | sudo tee -a /etc/hosts
    
Make the DNS entries

.. code-block:: bash

    echo "nameserver <PrimaryDNSIPIP>" >> sudo /etc/resolvconf/resolv.conf.d/head
      
    echo "nameserver <SecondaryDNSIP>" >> sudo /etc/resolvconf/resolv.conf.d/head
      
    resolvconf -u

Update the ubuntu software installer

.. code-block:: bash

    apt-get update
    
Check & Install Java

.. code-block:: bash

    apt-get install -y openjdk-8-jdk
  
    java -version

Download & install JMeter

.. code-block:: bash

    mkdir jMeter
     
     
    cd jMeter
     
     
    wget http://mirrors.whoishostingthis.com/apache//jmeter/binaries/apache-jmeter-5.1.1.zip
     
     
    unzip apache-jmeter-5.1.1.zip 

Install apex-pdp in virtual machine
-----------------------------------

We will be running apex-pdp as docker container. So we need to first install docker and then create the container hosting apex-pdp by pulling the image from ONAP repository.

**Docker Installation**

1. Make the etc/hosts entries

.. code-block:: bash

    echo $(hostname -I | cut -d\  -f1) $(hostname) | sudo tee -a /etc/hosts
    
2. Make the DNS entries

.. code-block:: bash

    echo "nameserver <PrimaryDNSIPIP>" >> sudo /etc/resolvconf/resolv.conf.d/head
    echo "nameserver <SecondaryDNSIP>" >> sudo /etc/resolvconf/resolv.conf.d/head
    resolvconf -u

3. Update the ubuntu software installer

.. code-block:: bash

    apt-get update

4. Check and Install Java

.. code-block:: bash

    apt-get install -y openjdk-8-jdk
    java -version

Ensure that the Java version that is executing is OpenJDK version 8

5. Check and install docker

.. code-block:: bash

    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
    add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
    apt-get update
    apt-cache policy docker-ce
    apt-get install -y docker-ce
    systemctl status docker
    docker ps

6. Change the permissions of the Docker socket file

.. code-block:: bash

    chmod 777 /var/run/docker.sock

7. Check the status of the Docker service and ensure it is running correctly

.. code-block:: bash

    service docker status
    docker ps

**Install apex-pdp**

Run the below command to create the container hosting apex-pdp by pulling the image from ONAP repository.

.. code-block:: bash

    docker run -d --name apex -p 12561:12561 -p 23324:23324 -it nexus3.onap.org:10001/onap/policy-apex-pdp:2.1.0-latest /bin/bash -c "/opt/app/policy/apex-pdp/bin/apexApps.sh jmx-test -c /opt/app/policy/apex-pdp/examples/config/SampleDomain/RESTServerJsonEvent.json"
    docker ps

Note: If you observe that requests from JMeter client is failing due to timeout, then modify the "RESTServerJsonEvent.json" mentioned in the above command and increase the "synchronousTimeout" property as per needed.

Install & Configure VisualVM
----------------------------

VisualVM needs to be installed in the virtual machine having apex-pdp. It will be used to monitor CPU, Memory, GC for apex-pdp while stability test is running.

Install visualVM

.. code-block:: bash

    sudo apt-get install visualvm

Login to docker container (using root)

.. code-block:: bash

    docker exec -u 0 -it apex /bin/bash
    
Run few commands to configure permissions

.. code-block:: bash

    cd /usr/lib/jvm/java-1.8-openjdk/bin/
 
    touch visualvm.policy
     
    vi visualvm.policy
     
    Add the following in visualvm.policy
     
     
    grant codebase "file:/usr/lib/jvm/java-1.8-openjdk/lib/tools.jar" {
       permission java.security.AllPermission;
    };
     
     
    chmod 777 visualvm.policy
     
     
    exit

Login to docker container (using normal user)

.. code-block:: bash

    docker exec -it apex /bin/bash

Run following commands to start jstatd using port 1111

.. code-block:: bash

    cd /usr/lib/jvm/java-1.8-openjdk/bin/
     
     
    ./jstatd -p 1111 -J-Djava.security.policy=visualvm.policy  &
     
     
    exit

Login to VM using graphical interface in separate terminal window.

.. code-block:: bash

    ssh -X <user>@<VM-IP-ADDRESS>

Open visualVM

.. code-block:: bash

    visualvm &
    
Connect to jstatd & remote apex-pdp JVM

1. Right click on "Remote" in the left panel of the screen and select "Add Remote Host..."

2. Enter the IP address of apex-pdp docker container.

.. code-block:: bash
    
    docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_name_or_id

3. Right click on IP address, select "Add jstatd Connection..."
4. In "jstatd Connections" tab, enter port 1111 and click OK.
5. Right click on IP address, select "Add JMX Connection..."
6. Enter the apex-pdp docker container IP Address (from step 2) <IP address>:9911 ( for example - 172.17.0.2:9911) and click OK.
7. Double click on the newly added nodes under "Remote" to start monitoring CPU, Memory & GC.

Sample Screenshot of visualVM

.. image:: images/apex-s3p-vvm-sample.jpg

Test Plan
---------

The 72 hours stability test will run the following steps in 20 threaded loop.

- **Send Input Event** - sends an input message to rest interface of apex-pdp.
- **Assert Response Code** - assert the response code coming from apex-pdp.
- **Assert Response Message** - assert the response message coming from apex-pdp.

The following steps can be used to configure the parameters of test plan.

- **HTTP Header Manager** - used to store headers which will be used for making HTTP requests.
- **HTTP Request Defaults** -  used to store HTTP request details like Server Name or IP, Port, Protocol etc.
- **User Defined Variables** -  used to store following user defined parameters.

==================  ============================================================================  ============================
**Name**            **Description**                                                               **Default Value**
==================  ============================================================================  ============================
wait                Wait time after each request (in milliseconds)                                500
threads             Number of threads to run test cases in parallel.                              20
threadsTimeOutInMs  Synchronization timer for threads running in parallel (in milliseconds).      5000
==================  ============================================================================  ============================


Download and update the jmx file presented in the apex-pdp git repository - `jmx file path <https://gerrit.onap.org/r/gitweb?p=policy/apex-pdp.git;a=tree;f=testsuites/apex-pdp-stability/src/main/resources;h=99d373033a190a690d4e05012bc3a656cae7bc3f;hb=refs/heads/master>`_.

- HTTPSampler.domain - The ip address of VM which the apex container is running
- HTTPSampler.port - The  listening port, here is 23324
- ThreadGroup.druation - Set the duration to 72 hours (in seconds)

Use the CLI mode to start the test

.. code-block:: bash

    ./jmeter.sh -n -t ~/apexPdpStabilityTestPlan.jmx -Jusers=1 -l ~/stability.log

Stability Test Result
---------------------

**Summary**

Stability test plan was triggered for 72 hours injecting input events to apex-pdp from 20 client threads running in JMeter.

After the test stop, we can generate a HTML test report via command

.. code-block:: bash

    ~/jMeter/apache-jmeter-5.1.1/bin/jmeter -g stability.log -o ./result/

==============================================  ===================================================  ================================  =============  ============
**Number of Client Threads running in JMeter**  **Number of Server Threads running in Apex engine**  **Total number of input events**  **Success %**  **Error %**
==============================================  ===================================================  ================================  =============  ============
20                                              4                                                    6394602                           99.999971%     0.0029%
==============================================  ===================================================  ================================  =============  ============

:download:`result.zip <zip/result.zip>`
:download:`onap.zip <zip/onap.zip>`


Setting up Performance Tests in APEX
++++++++++++++++++++++++++++++++++++

The apex-pdp has built in support for performance testing. A special performance testing REST server is available in the code base for performance testing. 
It is in the module `performance-benchmark-test <https://github.com/onap/policy-apex-pdp/tree/master/testsuites/performance/performance-benchmark-test>`_. 
To execute a benchmark test, you start the REST server, and then configure and run APEX against the server. 
There are example configurations for running tests in the `resources of this module <https://github.com/onap/policy-apex-pdp/tree/master/testsuites/performance/performance-benchmark-test/src/main/resources/examples/benchmark>`_.

In order to run the test for 72 hours, set the batch count in the `EventGeneratorConfig.json <https://github.com/onap/policy-apex-pdp/blob/master/testsuites/performance/performance-benchmark-test/src/main/resources/examples/benchmark/EventGeneratorConfig.json>`_ file to zero, which causes the REST server to generate batches forever.

Here is an example of how to do this:

1. Clone and build the apex-pdp git repo

2. Go into the performance-benchmark-test module and run the REST server

.. code-block:: bash

    cd testsuites/performance/performance-benchmark-test
    mvn exec:java -Dexec.mainClass="org.onap.policy.apex.testsuites.performance.benchmark.eventgenerator.EventGenerator" -Dexec.args="-c  src/main/resources/examples/benchmark/EventGeneratorConfig.json"

3. Separately, create a local directory and unzip the APEX tarball

.. code-block:: bash

    mkdir apex
    cd apex
    tar zxvf ~/git/onap/policy/apex-pdp/packages/apex-pdp-package-full/target/*gz
    
4. Run APEX with a configuration that runs against the benchmark REST server, select the configuration that is appropriate for the number of threads for the number of cores on the host on which APEX is running. For example on a 32 core machine, select the "32" configuration, on an 8 core machine, select the "08" configuration.

.. code-block:: bash

    bin/apexApps.sh engine -c ~/git/onap/policy/apex-pdp/testsuites/performance/performance-benchmark-test/src/main/resources/examples/benchmark/Javascript64.json
 
5. To get the test results, Issue the following command using CURL or from a browser(also can store the result into a file by setting outfile in the `EventGeneratorConfig.json <https://github.com/onap/policy-apex-pdp/blob/master/testsuites/performance/performance-benchmark-test/src/main/resources/examples/benchmark/EventGeneratorConfig.json>`_ file, statistics would be written into this file after event generator terminated)
 
.. code-block:: bash

    curl http://localhost:32801/EventGenerator/Stats
    
The results are similar to those below:
 
:download:`Example APEX performance metrics <json/example-apex-perf.json>`

Performance Test Result
-----------------------

**Summary**

Performance test was triggered for 2 hours on a 4 core, 4GB RAM virtual machine. 

**Test Statistics**

:download:`Attached result log <json/result.json>`

===============  =============  =================  ==============  =====================  ==================  =============  ===========
**batchNumber**  **batchSize**  **eventsNotSent**  **eventsSent**  **eventsNotReceived**  **eventsReceived**  **Success %**  **Error %**
===============  =============  =================  ==============  =====================  ==================  =============  ===========
3650             182500         0                  182500          0                      182500              100 %          0 %
===============  =============  =================  ==============  =====================  ==================  =============  ===========

========================  =========================  ========================
**averageRoundTripNano**  **shortestRoundTripNano**  **longestRoundTripNano**
========================  =========================  ========================
40024623                  7439158                    5161374486              
========================  =========================  ========================

============================  =============================  ============================
**averageApexExecutionNano**  **shortestApexExecutionNano**  **longestApexExecutionNano**
============================  =============================  ============================
1335622                       513650                         5104326434                  
============================  =============================  ============================