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DevOps / Sys Admin Q & A #10 : Trouble Shooting





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Load, throughput, and response time

What does performance mean to us?

To troubleshoot performance issues of our system, we need to understand the relationship between load, throughput, and response time.

  1. Load is where it all starts. It is the demand for work to be done (for example, 500 queries per second). Without it, we have no work and, therefore, no response time. This is also what causes performance to degrade. At some point, there is a greater demand for work than the application's capacity of delivering, which is when bottlenecks occur.
  2. Throughput (for example, 1,000 requests per second) is the execution rate of the work being demanded. The relationship between load and throughput is predictable. As load increases, throughput will also increase until some resource gets saturated, after which throughput will get plateaued. When throughput plateaus, it's an indicator our application scales any more.
  3. Response time (msec) is the side effect of throughput. While throughput increase proportionately to load, response time will increase negligibly, but once the system reaches throughput plateau, response time will increase exponentially with the telltale "hockey stick" curve as queuing occurs. Load-Throughput-ResponseTime.png

    Source: reference 1


The relationship between load and throughput becomes increasingly important in complex multi-tier applications. When a throughput plateau occurs, it may be visible across the multiple tiers simultaneously as shown in the picture below:

Throughput1.png

We could blame downstream items in situations like this, because poor performance downstream usually bubbles upstream. That could be a proper assessment for response time, however, it does not always apply to throughput.


By comparing throughput to load at each tier, we can identify what the root cause is. Here's one possible scenario corresponding to the throughput above, where the load scales linearly at each tier. In our case, since the load actually did increase continually at the database tier, we can safely identify that the bottleneck is indeed on the downstream database tier.

Throughput2.png

We may have another scenario where the app server load increases linearly, but does not propagate to the database tier as shown in the picture below:

Throughput3.png

So, the bottleneck is not in database tier but actually in the application server, which is not passing the load down to the database server. Note that load is the demand for work, and at some point the database is not being asked for anything additional. Without additional load, we won't have additional throughput.






Leaks - CPU, I/O (file handles or database connections), Memory

Note: this section is based on ref #1.

"A leak occurs whenever an application uses a resource and then doesn't give it back when it's done. Possible resources include memory, file handles, database connections, and many other things. Even resources like CPU and I/O can leak if the calling code encounters an unexpected condition that causes a loop it can't break out of, and then processing accumulates over time asmore instances of that code stack up."

Do we a have a leak?

Here are some signs that we most likely have a leak, or some leak-like behavior, in our application:
  1. App gets progressively slower over time, requiring routine restarts to resolve.
  2. App gets progressively slower over time, but restarts don't help.
  3. App runs fine for a few days or weeks and then suddenly starts failing, requiring a restart.
  4. Can see some resource's utilization growing over time, requiring a restart to resolve the issue.
  5. Haven't made any changes to the app's code or environment, yet its behavior changes over time.

We can monitor the heap utilization (heap dump) of each app's object in real time and trend it historically:

HeapObjects.png

We can see the blue and green objects have some issues of leaking.




References
  1. Hidden in Plain Sight: Practical Tips for Detecting and Fixing the Underlying Causes of Common Application Performance Problems




DevOps

  • Phases of Continuous Integration
  • Software development methodology
  • Introduction to DevOps
  • Samples of Continuous Integration (CI) / Continuous Delivery (CD) - Use cases
  • Artifact repository and repository management
  • Linux - General, shell programming, processes & signals ...
  • RabbitMQ...
  • MariaDB
  • New Relic APM with NodeJS : simple agent setup on AWS instance
  • Nagios on CentOS 7 with Nagios Remote Plugin Executor (NRPE)
  • Nagios - The industry standard in IT infrastructure monitoring on Ubuntu
  • Zabbix 3 install on Ubuntu 14.04 & adding hosts / items / graphs
  • Datadog - Monitoring with PagerDuty/HipChat and APM
  • Install and Configure Mesos Cluster
  • Cassandra on a Single-Node Cluster
  • OpenStack install on Ubuntu 16.04 server - DevStack
  • AWS EC2 Container Service (ECS) & EC2 Container Registry (ECR) | Docker Registry
  • CI/CD with CircleCI - Heroku deploy
  • Introduction to Terraform with AWS elb & nginx
  • Kubernetes I - Running Kubernetes Locally via Minikube
  • Kubernetes II - kops on AWS
  • Kubernetes III - kubeadm on AWS
  • CI/CD Github actions
  • CI/CD Gitlab



  • DevOps / Sys Admin Q & A

  • (1A) - Linux Commands
  • (1B) - Linux Commands
  • (2) - Networks
  • (2B) - Networks
  • (3) - Linux Systems
  • (4) - Scripting (Ruby/Shell)
  • (5) - Configuration Management
  • (6) - AWS VPC setup (public/private subnets with NAT)
  • (6B) - AWS VPC Peering
  • (7) - Web server
  • (8) - Database
  • (9) - Linux System / Application Monitoring, Performance Tuning, Profiling Methods & Tools
  • (10) - Trouble Shooting: Load, Throughput, Response time and Leaks
  • (11) - SSH key pairs & SSL Certificate
  • (12) - Why is the database slow?
  • (13) - Is my web site down?
  • (14) - Is my server down?
  • (15) - Why is the server sluggish?
  • (16A) - Serving multiple domains using Virtual Hosts - Apache
  • (16B) - Serving multiple domains using server block - Nginx
  • (16C) - Reverse proxy servers and load balancers - Nginx
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  • (20) - Log Rotation
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  • (23) - Wireshark introduction
  • (24) - User account management
  • (25) - Domain Name System (DNS)
  • (26) - NGINX SSL/TLS, Caching, and Session
  • (27) - Troubleshooting 5xx server errors
  • (28) - Linux Systemd: journalctl
  • (29) - Linux Systemd: FirewallD
  • (30) - Linux: SELinux
  • (31) - Linux: Samba
  • (0) - Linux Sys Admin's Day to Day tasks


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    13. Linux shell programming : arrays - three different ways of declaring arrays & looping with $*/$@
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    27. Linux Secure Shell (SSH) IV : Local port forwarding (outgoing ssh tunnel)
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    DevOps



    Phases of Continuous Integration

    Software development methodology

    Introduction to DevOps

    Samples of Continuous Integration (CI) / Continuous Delivery (CD) - Use cases

    Artifact repository and repository management

    Linux - General, shell programming, processes & signals ...

    RabbitMQ...

    MariaDB

    New Relic APM with NodeJS : simple agent setup on AWS instance

    Nagios on CentOS 7 with Nagios Remote Plugin Executor (NRPE)

    Nagios - The industry standard in IT infrastructure monitoring on Ubuntu

    Zabbix 3 install on Ubuntu 14.04 & adding hosts / items / graphs

    Datadog - Monitoring with PagerDuty/HipChat and APM

    Install and Configure Mesos Cluster

    Cassandra on a Single-Node Cluster

    Container Orchestration : Docker Swarm vs Kubernetes vs Apache Mesos

    OpenStack install on Ubuntu 16.04 server - DevStack

    AWS EC2 Container Service (ECS) & EC2 Container Registry (ECR) | Docker Registry

    CI/CD with CircleCI - Heroku deploy

    Introduction to Terraform with AWS elb & nginx

    Docker & Kubernetes

    Kubernetes I - Running Kubernetes Locally via Minikube

    Kubernetes II - kops on AWS

    Kubernetes III - kubeadm on AWS

    AWS : EKS (Elastic Container Service for Kubernetes)

    CI/CD Github actions

    CI/CD Gitlab



    DevOps / Sys Admin Q & A



    (1A) - Linux Commands

    (1B) - Linux Commands

    (2) - Networks

    (2B) - Networks

    (3) - Linux Systems

    (4) - Scripting (Ruby/Shell)

    (5) - Configuration Management

    (6) - AWS VPC setup (public/private subnets with NAT)

    (6B) - AWS VPC Peering

    (7) - Web server

    (8) - Database

    (9) - Linux System / Application Monitoring, Performance Tuning, Profiling Methods & Tools

    (10) - Trouble Shooting: Load, Throughput, Response time and Leaks

    (11) - SSH key pairs, SSL Certificate, and SSL Handshake

    (12) - Why is the database slow?

    (13) - Is my web site down?

    (14) - Is my server down?

    (15) - Why is the server sluggish?

    (16A) - Serving multiple domains using Virtual Hosts - Apache

    (16B) - Serving multiple domains using server block - Nginx

    (16C) - Reverse proxy servers and load balancers - Nginx

    (17) - Linux startup process

    (18) - phpMyAdmin with Nginx virtual host as a subdomain

    (19) - How to SSH login without password?

    (20) - Log Rotation

    (21) - Monitoring Metrics

    (22) - lsof

    (23) - Wireshark introduction

    (24) - User account management

    (25) - Domain Name System (DNS)

    (26) - NGINX SSL/TLS, Caching, and Session

    (27) - Troubleshooting 5xx server errors

    (28) - Linux Systemd: journalctl

    (29) - Linux Systemd: FirewallD

    (30) - Linux: SELinux

    (31) - Linux: Samba

    (0) - Linux Sys Admin's Day to Day tasks



    Sponsor Open Source development activities and free contents for everyone.

    Thank you.

    - K Hong







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    AWS API Gateway endpoint invoking Lambda function

    AWS API Gateway invoking Lambda function with Terraform

    AWS API Gateway invoking Lambda function with Terraform - Lambda Container

    Amazon Kinesis Streams

    Kinesis Data Firehose with Lambda and ElasticSearch

    Amazon DynamoDB

    Amazon DynamoDB with Lambda and CloudWatch

    Loading DynamoDB stream to AWS Elasticsearch service with Lambda

    Amazon ML (Machine Learning)

    Simple Systems Manager (SSM)

    AWS : RDS Connecting to a DB Instance Running the SQL Server Database Engine

    AWS : RDS Importing and Exporting SQL Server Data

    AWS : RDS PostgreSQL & pgAdmin III

    AWS : RDS PostgreSQL 2 - Creating/Deleting a Table

    AWS : MySQL Replication : Master-slave

    AWS : MySQL backup & restore

    AWS RDS : Cross-Region Read Replicas for MySQL and Snapshots for PostgreSQL

    AWS : Restoring Postgres on EC2 instance from S3 backup

    AWS : Q & A

    AWS : Security

    AWS : Security groups vs. network ACLs

    AWS : Scaling-Up

    AWS : Networking

    AWS : Single Sign-on (SSO) with Okta

    AWS : JIT (Just-in-Time) with Okta



    Jenkins



    Install

    Configuration - Manage Jenkins - security setup

    Adding job and build

    Scheduling jobs

    Managing_plugins

    Git/GitHub plugins, SSH keys configuration, and Fork/Clone

    JDK & Maven setup

    Build configuration for GitHub Java application with Maven

    Build Action for GitHub Java application with Maven - Console Output, Updating Maven

    Commit to changes to GitHub & new test results - Build Failure

    Commit to changes to GitHub & new test results - Successful Build

    Adding code coverage and metrics

    Jenkins on EC2 - creating an EC2 account, ssh to EC2, and install Apache server

    Jenkins on EC2 - setting up Jenkins account, plugins, and Configure System (JAVA_HOME, MAVEN_HOME, notification email)

    Jenkins on EC2 - Creating a Maven project

    Jenkins on EC2 - Configuring GitHub Hook and Notification service to Jenkins server for any changes to the repository

    Jenkins on EC2 - Line Coverage with JaCoCo plugin

    Setting up Master and Slave nodes

    Jenkins Build Pipeline & Dependency Graph Plugins

    Jenkins Build Flow Plugin

    Pipeline Jenkinsfile with Classic / Blue Ocean

    Jenkins Setting up Slave nodes on AWS

    Jenkins Q & A





    Puppet



    Puppet with Amazon AWS I - Puppet accounts

    Puppet with Amazon AWS II (ssh & puppetmaster/puppet install)

    Puppet with Amazon AWS III - Puppet running Hello World

    Puppet Code Basics - Terminology

    Puppet with Amazon AWS on CentOS 7 (I) - Master setup on EC2

    Puppet with Amazon AWS on CentOS 7 (II) - Configuring a Puppet Master Server with Passenger and Apache

    Puppet master /agent ubuntu 14.04 install on EC2 nodes

    Puppet master post install tasks - master's names and certificates setup,

    Puppet agent post install tasks - configure agent, hostnames, and sign request

    EC2 Puppet master/agent basic tasks - main manifest with a file resource/module and immediate execution on an agent node

    Setting up puppet master and agent with simple scripts on EC2 / remote install from desktop

    EC2 Puppet - Install lamp with a manifest ('puppet apply')

    EC2 Puppet - Install lamp with a module

    Puppet variable scope

    Puppet packages, services, and files

    Puppet packages, services, and files II with nginx Puppet templates

    Puppet creating and managing user accounts with SSH access

    Puppet Locking user accounts & deploying sudoers file

    Puppet exec resource

    Puppet classes and modules

    Puppet Forge modules

    Puppet Express

    Puppet Express 2

    Puppet 4 : Changes

    Puppet --configprint

    Puppet with Docker

    Puppet 6.0.2 install on Ubuntu 18.04





    Chef



    What is Chef?

    Chef install on Ubuntu 14.04 - Local Workstation via omnibus installer

    Setting up Hosted Chef server

    VirtualBox via Vagrant with Chef client provision

    Creating and using cookbooks on a VirtualBox node

    Chef server install on Ubuntu 14.04

    Chef workstation setup on EC2 Ubuntu 14.04

    Chef Client Node - Knife Bootstrapping a node on EC2 ubuntu 14.04





    Elasticsearch search engine, Logstash, and Kibana



    Elasticsearch, search engine

    Logstash with Elasticsearch

    Logstash, Elasticsearch, and Kibana 4

    Elasticsearch with Redis broker and Logstash Shipper and Indexer

    Samples of ELK architecture

    Elasticsearch indexing performance



    Vagrant



    VirtualBox & Vagrant install on Ubuntu 14.04

    Creating a VirtualBox using Vagrant

    Provisioning

    Networking - Port Forwarding

    Vagrant Share

    Vagrant Rebuild & Teardown

    Vagrant & Ansible





    GCP (Google Cloud Platform)



    GCP: Creating an Instance

    GCP: gcloud compute command-line tool

    GCP: Deploying Containers

    GCP: Kubernetes Quickstart

    GCP: Deploying a containerized web application via Kubernetes

    GCP: Django Deploy via Kubernetes I (local)

    GCP: Django Deploy via Kubernetes II (GKE)





    Big Data & Hadoop Tutorials



    Hadoop 2.6 - Installing on Ubuntu 14.04 (Single-Node Cluster)

    Hadoop 2.6.5 - Installing on Ubuntu 16.04 (Single-Node Cluster)

    Hadoop - Running MapReduce Job

    Hadoop - Ecosystem

    CDH5.3 Install on four EC2 instances (1 Name node and 3 Datanodes) using Cloudera Manager 5

    CDH5 APIs

    QuickStart VMs for CDH 5.3

    QuickStart VMs for CDH 5.3 II - Testing with wordcount

    QuickStart VMs for CDH 5.3 II - Hive DB query

    Scheduled start and stop CDH services

    CDH 5.8 Install with QuickStarts Docker

    Zookeeper & Kafka Install

    Zookeeper & Kafka - single node single broker

    Zookeeper & Kafka - Single node and multiple brokers

    OLTP vs OLAP

    Apache Hadoop Tutorial I with CDH - Overview

    Apache Hadoop Tutorial II with CDH - MapReduce Word Count

    Apache Hadoop Tutorial III with CDH - MapReduce Word Count 2

    Apache Hadoop (CDH 5) Hive Introduction

    CDH5 - Hive Upgrade to 1.3 to from 1.2

    Apache Hive 2.1.0 install on Ubuntu 16.04

    Apache HBase in Pseudo-Distributed mode

    Creating HBase table with HBase shell and HUE

    Apache Hadoop : Hue 3.11 install on Ubuntu 16.04

    Creating HBase table with Java API

    HBase - Map, Persistent, Sparse, Sorted, Distributed and Multidimensional

    Flume with CDH5: a single-node Flume deployment (telnet example)

    Apache Hadoop (CDH 5) Flume with VirtualBox : syslog example via NettyAvroRpcClient

    List of Apache Hadoop hdfs commands

    Apache Hadoop : Creating Wordcount Java Project with Eclipse Part 1

    Apache Hadoop : Creating Wordcount Java Project with Eclipse Part 2

    Apache Hadoop : Creating Card Java Project with Eclipse using Cloudera VM UnoExample for CDH5 - local run

    Apache Hadoop : Creating Wordcount Maven Project with Eclipse

    Wordcount MapReduce with Oozie workflow with Hue browser - CDH 5.3 Hadoop cluster using VirtualBox and QuickStart VM

    Spark 1.2 using VirtualBox and QuickStart VM - wordcount

    Spark Programming Model : Resilient Distributed Dataset (RDD) with CDH

    Apache Spark 2.0.2 with PySpark (Spark Python API) Shell

    Apache Spark 2.0.2 tutorial with PySpark : RDD

    Apache Spark 2.0.0 tutorial with PySpark : Analyzing Neuroimaging Data with Thunder

    Apache Spark Streaming with Kafka and Cassandra

    Apache Spark 1.2 with PySpark (Spark Python API) Wordcount using CDH5

    Apache Spark 1.2 Streaming

    Apache Drill with ZooKeeper install on Ubuntu 16.04 - Embedded & Distributed

    Apache Drill - Query File System, JSON, and Parquet

    Apache Drill - HBase query

    Apache Drill - Hive query

    Apache Drill - MongoDB query





    Redis In-Memory Database



    Redis vs Memcached

    Redis 3.0.1 Install

    Setting up multiple server instances on a Linux host

    Redis with Python

    ELK : Elasticsearch with Redis broker and Logstash Shipper and Indexer





    Powershell 4 Tutorial



    Powersehll : Introduction

    Powersehll : Help System

    Powersehll : Running commands

    Powersehll : Providers

    Powersehll : Pipeline

    Powersehll : Objects

    Powershell : Remote Control

    Windows Management Instrumentation (WMI)

    How to Enable Multiple RDP Sessions in Windows 2012 Server

    How to install and configure FTP server on IIS 8 in Windows 2012 Server

    How to Run Exe as a Service on Windows 2012 Server

    SQL Inner, Left, Right, and Outer Joins





    Git/GitHub Tutorial



    One page express tutorial for GIT and GitHub

    Installation

    add/status/log

    commit and diff

    git commit --amend

    Deleting and Renaming files

    Undoing Things : File Checkout & Unstaging

    Reverting commit

    Soft Reset - (git reset --soft <SHA key>)

    Mixed Reset - Default

    Hard Reset - (git reset --hard <SHA key>)

    Creating & switching Branches

    Fast-forward merge

    Rebase & Three-way merge

    Merge conflicts with a simple example

    GitHub Account and SSH

    Uploading to GitHub

    GUI

    Branching & Merging

    Merging conflicts

    GIT on Ubuntu and OS X - Focused on Branching

    Setting up a remote repository / pushing local project and cloning the remote repo

    Fork vs Clone, Origin vs Upstream

    Git/GitHub Terminologies

    Git/GitHub via SourceTree I : Commit & Push

    Git/GitHub via SourceTree II : Branching & Merging

    Git/GitHub via SourceTree III : Git Work Flow

    Git/GitHub via SourceTree IV : Git Reset

    Git Cheat sheet - quick command reference






    Subversion

    Subversion Install On Ubuntu 14.04

    Subversion creating and accessing I

    Subversion creating and accessing II








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