Click here to close now.

Welcome!

Microservices Journal Authors: Elizabeth White, Carmen Gonzalez, Yeshim Deniz, Liz McMillan, Roger Strukhoff

Related Topics: DevOps Journal, Java, Microservices Journal, Linux, AJAX & REA, Web 2.0

DevOps Journal: Blog Post

Don’t Trust Your Log Files | @DevOpsSummit [#DevOps]

Most exceptions are handled by your code or by the frameworks your app uses

Don’t Trust Your Log Files: How and Why to Monitor All Exceptions

I would say that only one out of a million exceptions thrown in an application actually makes it to a log file - unless you run your application in verbose logging mode - Do you agree? No? Here is why I think that is: because most exceptions are handled by your code or by the frameworks your app uses. Here is a chart from an enterprise application showing that there are about 4000x more custom application exception objects thrown than important log messages written:

4000 times more Exceptions than log messages: Can they be ignored? What's their impact?

Why worry about these exceptions that nobody cares to write to a log file? Two reasons:

  1. They are typically thrown for a good reason and therefore indicate a problem, e.g., configuration issues in frameworks or runtime problems
  2. Every Exception object is a potential performance problem because it means the JVM needs to allocate memory, get the stack trace and dispose the object soon after

Reason #1: Configuration Problems
The following shows a transaction where the method getImagePath makes a web service call to a back-end server using HttpClient. getImagePath uses an HTTP Endpoint URL. The Web Service however only supports HTTPS (SSL). The web service call therefore fails with an SSLException. getImagePath retries three times until it gives up and just returns a default value to the caller. No log entry written, no exception thrown to the caller, everything seems okay to the outside world even though we have a severe impact on an end user who is waiting longer than necessary for an image that he doesn't get to see:

Exceptions are highlighting configuration problems (wrong URL) but the calling method is not doing anything with that information

Key Takeaways:

  • End Users: This code is executed for every user that executes this request and none of them will get the correct image path. Additionally, the user is waiting on it for several seconds. We all know what users will do if they have to wait too long.
  • Business: If your app delivers dynamic user-specific content, e.g., recommendations for that user, you need to ensure that no configuration problem causes your app to deliver incorrect content. As business owner you want to get alerted when a problem in the app causes incorrect responses to your users.
  • Operations: When users complain, there is no documented evidence of a problem (nothing in a log file). Make sure to monitor outgoing web requests and the status of these calls as this helps you to identify if you have requests that start failing or not delivering what they are supposed to deliver.
  • Developers: Everything probably worked well when they tested this web service in their own environment where they used a dummy or mocked web service endpoint. Make sure to add log for these situations and let Operations know how to configure these endpoints.

For Reason #2, and further insight, click here for the full article.

More Stories By Andreas Grabner

Andreas Grabner has been helping companies improve their application performance for 15+ years. He is a regular contributor within Web Performance and DevOps communities and a prolific speaker at user groups and conferences around the world. Reach him at @grabnerandi

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


@MicroservicesExpo Stories
SYS-CON Events announced today the DevOps Foundation Certification Course, being held June ?, 2015, in conjunction with DevOps Summit and 16th Cloud Expo at the Javits Center in New York City, NY. This sixteen (16) hour course provides an introduction to DevOps – the cultural and professional movement that stresses communication, collaboration, integration and automation in order to improve the flow of work between software developers and IT operations professionals. Improved workflows will res...
SYS-CON Events announced today that Akana, formerly SOA Software, has been named “Bronze Sponsor” of SYS-CON's 16th International Cloud Expo® New York, which will take place June 9-11, 2015, at the Javits Center in New York City, NY. Akana’s comprehensive suite of API Management, API Security, Integrated SOA Governance, and Cloud Integration solutions helps businesses accelerate digital transformation by securely extending their reach across multiple channels – mobile, cloud and Internet of Thi...
SYS-CON Events announced today that StorPool Storage will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. StorPool is distributed storage software that allows service providers, enterprises and other cloud builders to run data storage on standard x86 servers, instead of using expensive and inefficient storage arrays (SAN).
ProfitBricks, the provider of painless cloud infrastructure for IaaS, today announced the release of a Node.js SDK written against its recently launched REST API. This new JavaScript based library provides coverage for all existing ProfitBricks REST API functions. With additional libraries set to release this month, ProfitBricks continues to prove its dedication to the DevOps community and commitment to making cloud migrations and cloud management painless. Node.js is an open source, cross-pl...
SYS-CON Events announced today that Site24x7, the cloud infrastructure monitoring service, will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Site24x7 is a cloud infrastructure monitoring service that helps monitor the uptime and performance of websites, online applications, servers, mobile websites and custom APIs. The monitoring is done from 50+ locations across the world and from various wireless carr...
The stack is the hack, Jack. That's my takeaway from several events I attended over the past few weeks in Silicon Valley and Southeast Asia. I listened to and participated in discussions about everything from large datacenter management (think Facebook Open Compute) to enterprise-level cyberfraud (at a seminar in Manila attended by the US State Dept. and Philippine National Police) to the world of entrepreneurial startups, app deployment, and mobility (in a series of meetups and talks in bot...
SYS-CON Events announced today that B2Cloud, a provider of enterprise resource planning software, will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. B2cloud develops the software you need. They have the ideal tools to help you work with your clients. B2Cloud’s main solutions include AGIS – ERP, CLOHC, AGIS – Invoice, and IZUM
SYS-CON Events announced today that Tufin, the market-leading provider of Security Policy Orchestration Solutions, will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. As the market leader of Security Policy Orchestration, Tufin automates and accelerates network configuration changes while maintaining security and compliance. Tufin's award-winning Orchestration Suite™ gives IT organizations the power and a...
SYS-CON Events announced today that Cloudian, Inc., the leading provider of hybrid cloud storage solutions, will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Cloudian, Inc., is a Foster City, California - based software company specializing in cloud storage software. The main product is Cloudian, an Amazon S3-compliant cloud object storage platform, the bedrock of cloud computing systems, that enables c...
SYS-CON Events announced today the IoT Bootcamp – Jumpstart Your IoT Strategy, being held June 9–10, 2015, in conjunction with 16th Cloud Expo and Internet of @ThingsExpo at the Javits Center in New York City. This is your chance to jumpstart your IoT strategy. Combined with real-world scenarios and use cases, the IoT Bootcamp is not just based on presentations but includes hands-on demos and walkthroughs. We will introduce you to a variety of Do-It-Yourself IoT platforms including Arduino, Ras...
SYS-CON Events announced today that Soha will exhibit at SYS-CON's DevOps Summit New York, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Soha delivers enterprise-grade application security, on any device, as agile as the cloud. This turnkey, cloud-based service enables customers to solve secure application access and delivery challenges that traditional or virtualized network solutions cannot solve because they are too expensive, inflexible and operational...
SYS-CON Events announced today that Ciqada will exhibit at SYS-CON's @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Ciqada™ makes it easy to connect your products to the Internet. By integrating key components - hardware, servers, dashboards, and mobile apps - into an easy-to-use, configurable system, your products can quickly and securely join the internet of things. With remote monitoring, control, and alert messaging capability, you will mee...
Containers and microservices have become topics of intense interest throughout the cloud developer and enterprise IT communities. Accordingly, attendees at the upcoming 16th Cloud Expo at the Javits Center in New York June 9-11 will find fresh new content in a new track called PaaS | Containers & Microservices Containers are not being considered for the first time by the cloud community, but a current era of re-consideration has pushed them to the top of the cloud agenda. With the launch ...
of cloud, colocation, managed services and disaster recovery solutions, will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. TierPoint, LLC, is a leading national provider of information technology and data center services, including cloud, colocation, disaster recovery and managed IT services, with corporate headquarters in St. Louis, MO. TierPoint was formed through the strategic combination of some of t...
Public Cloud IaaS started it's life in the developer and startup communities and has grown rapidly to a $20B+ industry, but it still pales in comparison to how much is spent worldwide on IT: $3.6 trillion. In fact, there are 8.6 million data centers worldwide, the reality is many small and medium sized business have server closets and colocation footprints filled with servers and storage gear. While on-premise environment virtualization may have peaked at 75%, the Public Cloud has lagged in ado...
Dave will share his insights on how Internet of Things for Enterprises are transforming and making more productive and efficient operations and maintenance (O&M) procedures in the cleantech industry and beyond. Speaker Bio: Dave Landa is chief operating officer of Cybozu Corp (kintone US). Based in the San Francisco Bay Area, Dave has been on the forefront of the Cloud revolution driving strategic business development on the executive teams of multiple leading Software as a Services (SaaS) ap...
Microsoft is releasing in the near future Azure Service Fabric as a preview beta. Azure Service Fabric is built to run microservices - a complex application consisting of smaller, interlocked components that enables updating components without disrupting service. Microsoft has used this over the past few years internally for many of its own applications and the new release is for general use, a new product. OSIsoft is an early adopter of this system and run with it to expand into the explo...
ProfitBricks, the provider of painless cloud infrastructure IaaS, today released its SDK for Ruby, written against the company's new RESTful API. The new SDK joins ProfitBricks' previously announced support for the popular multi-cloud open-source Fog project. This new Ruby SDK, which exposes advanced functionality to take advantage of ProfitBricks' simplicity and productivity, aligns with ProfitBricks' mission to provide a painless way to automate infrastructure in the cloud. Ruby is a genera...
ProfitBricks, the provider of painless cloud infrastructure IaaS, announced the launch of its new DevOps Central and REST API, along with support for three multi-cloud libraries and a Python SDK. This, combined with its already existing SOAP API and its new RESTful API, moves ProfitBricks into a position to better serve the DevOps community and provide the ability to automate cloud infrastructure in a multi-cloud world. Following this momentum, ProfitBricks is also today introducing several l...
What exactly is a cognitive application? In her session at 16th Cloud Expo, Ashley Hathaway, Product Manager at IBM Watson, will look at the services being offered by the IBM Watson Developer Cloud and what that means for developers and Big Data. She'll explore how IBM Watson and its partnerships will continue to grow and help define what it means to be a cognitive service, as well as take a look at the offerings on Bluemix. She will also check out how Watson and the Alchemy API team up to off...