Welcome!

Microsoft Cloud Authors: Janakiram MSV, Yeshim Deniz, David H Deans, Andreas Grabner, Stackify Blog

Related Topics: @DevOpsSummit, Microsoft Cloud, Linux Containers, Containers Expo Blog

@DevOpsSummit: Blog Post

How to Monitor Logging By @AppDynamics | @DevOpsSummit [#DevOps]

Applications typically log additional data such as exceptions to different data sources

Applications typically log additional data such as exceptions to different data sources. Windows event logs, local files, and SQL databases are most commonly used in production. New applications can take advantage of leveraging big data instead of individual files or SQL.

One of the most surprising experiences when we start monitoring applications is noticing the logging is not configured properly in production environments. There have been two types of misconfiguration errors we’ve seen often in the field:

  1. logging configuration is copied from staging settings

  2. while deploying the application to production environment, logging wasn’t fully configured and the logging failed to log any data

To take a closer look, I have a couple of sample applications to show how the problems could manifest themselves. These sample applications were implemented using MVC5 and are running in Windows Azure and using Microsoft Enterprise Library Exception Handling and Logging blocks to log exceptions to the SQL database. There is no specific preference regarding logging framework or storage, just wanted to demonstrate problems similar to what we’ve seen with different customers.

Situation #1 Logging configuration was copied from staging to production and points to the staging SQL database

When we installed AppDynamics and it automatically detected the application flowmap, I noticed the application talks to the production UserData database and… a staging database for logging.

The other issue was the extremely slow response time while calling the logging database. The following snapshot can explain the slow performance, as you see there’s an exception happening while trying to run an ADO.NET query:

Exception details confirm the application was not able to connect to a database, which is expected — the production environment in located in DMZ and usually can’t reach a staging network.

To restate what we see above — this is a failure while trying to log the original exception which could be anything from a user not being able to log into the website to failing to checkout.

At the same time the impact is even higher because the application spends 15 seconds trying to connect to the logging database and timeout, all while the user is waiting.

Situation #2 During deployment the service account wasn’t granted permissions to write to the logging database

This looks similar to the example above but when we drill inside the error we can see the request has an internal exception happened during the processing:

The exception says the service account didn’t have permissions to run the stored procedure “WriteLog” which logs entries to the logging database. From the performance perspective, the overhead of security failure is less from timeouts in the example above but the result is the same — we won’t be able to see the originating exception.

Not fully documenting or automating the application deployment/configuration process usually causes such problems.

These are one-time issues that once you fix it will work on the machine. However, next time you deploy the application to a new server or VM this will happen again until you fix the deployment.

Let’s check the EntLigLogging database — it has no rows

Here’s some analysis to explain why this happened:

  1. We found exceptions when the application was logging the error

  2. This means there was an original error and the application was trying to report it using logging

  3. Logging failed which means the original error was never reported!

  4. And… logging doesn’t log anywhere about its failures, which means from a logging perspective the application has no problems!!

This is logically correct — if you can’t log data to the storage database you can’t log anything. Typically, loggers are implemented similar to the following example:

Logging is the last option in this case and when it fails nothing else happens as you see in the code above.

Just to clarify, AppDynamics was able to report these exceptions because the agent instruments common methods like ADO.NET calls, HTTP calls, and other exit calls as well as error handlers, which helped in identifying the problem.

Going back to our examples, what if the deployment and configuration process is now fixed and fully automated so there can’t be a manual mistake? Do you still need to worry? Unfortunately, these issues happen more often than you’d expect, here is another real example.

Situation #3 What happens when the logging database fills up?

Everything is configured correctly but at some point the logging database fills up. In the screenshot above you can this this happened around 10:15pm. As a result, the response time and error rates have spiked.

Here is one of the snapshots collected at that time:

You can see that in this situation it took over 32 seconds trying to log data. Here are the exception details:

The worst part is at 10:15pm the application was not able to report about its own problems due to the database being completely full, which may incorrectly be translated that the application is healthy since it is “not failing” because there are no new log entries.

We’ve seen enough times that the logging database isn’t seen as a critical piece of the application therefore it gets pushed down the priority list and often overlooked. Logging is part of your application logic and it should fall into the same category as the application. It’s essential to document, test, properly deploy and monitor the logging.

This problem could be avoided entirely unless your application receives an unexpected surge of traffic due to a sales event, new release, marketing campaign, etc. Other than the rare Slashdotting effect, your database should never get to full capacity and result in a lack of logging. Without sufficient room in your database, your application’s performance is in jeopardy and you won’t know since your monitoring framework isn’t notifying you. Because these issues are still possible, albeit during a large load surge, it’s important to continuously monitor your loggingn as you wouldn’t want an issue to occur during an important event.

Key points:

  • Logging adds a new dependency to the application

  • Logging can fail to log the data – there could be several reasons why

  • When this happens you won’t be notified about the original problem or a logging failure and the performance issues will compound

This would never happen to your application, would it?

If you’d like to try AppDynamics check out our free trial and start monitoring your apps today! Also, be sure to check out my previous post, The Real Cost of Logging.

The post How Do you Monitor Your Logging? written by appeared first on Application Performance Monitoring Blog from AppDynamics.

Read the original blog entry...

More Stories By AppDynamics Blog

In high-production environments where release cycles are measured in hours or minutes — not days or weeks — there's little room for mistakes and no room for confusion. Everyone has to understand what's happening, in real time, and have the means to do whatever is necessary to keep applications up and running optimally.

DevOps is a high-stakes world, but done well, it delivers the agility and performance to significantly impact business competitiveness.

@ThingsExpo Stories
To get the most out of their data, successful companies are not focusing on queries and data lakes, they are actively integrating analytics into their operations with a data-first application development approach. Real-time adjustments to improve revenues, reduce costs, or mitigate risk rely on applications that minimize latency on a variety of data sources. In his session at @BigDataExpo, Jack Norris, Senior Vice President, Data and Applications at MapR Technologies, reviewed best practices t...
"Evatronix provides design services to companies that need to integrate the IoT technology in their products but they don't necessarily have the expertise, knowledge and design team to do so," explained Adam Morawiec, VP of Business Development at Evatronix, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
Recently, REAN Cloud built a digital concierge for a North Carolina hospital that had observed that most patient call button questions were repetitive. In addition, the paper-based process used to measure patient health metrics was laborious, not in real-time and sometimes error-prone. In their session at 21st Cloud Expo, Sean Finnerty, Executive Director, Practice Lead, Health Care & Life Science at REAN Cloud, and Dr. S.P.T. Krishnan, Principal Architect at REAN Cloud, discussed how they built...
No hype cycles or predictions of a gazillion things here. IoT is here. You get it. You know your business and have great ideas for a business transformation strategy. What comes next? Time to make it happen. In his session at @ThingsExpo, Jay Mason, an Associate Partner of Analytics, IoT & Cybersecurity at M&S Consulting, presented a step-by-step plan to develop your technology implementation strategy. He also discussed the evaluation of communication standards and IoT messaging protocols, data...
With tough new regulations coming to Europe on data privacy in May 2018, Calligo will explain why in reality the effect is global and transforms how you consider critical data. EU GDPR fundamentally rewrites the rules for cloud, Big Data and IoT. In his session at 21st Cloud Expo, Adam Ryan, Vice President and General Manager EMEA at Calligo, examined the regulations and provided insight on how it affects technology, challenges the established rules and will usher in new levels of diligence arou...
Smart cities have the potential to change our lives at so many levels for citizens: less pollution, reduced parking obstacles, better health, education and more energy savings. Real-time data streaming and the Internet of Things (IoT) possess the power to turn this vision into a reality. However, most organizations today are building their data infrastructure to focus solely on addressing immediate business needs vs. a platform capable of quickly adapting emerging technologies to address future ...
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, led attendees through the exciting evolution of the cloud. He looked at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering m...
In his session at 21st Cloud Expo, Raju Shreewastava, founder of Big Data Trunk, provided a fun and simple way to introduce Machine Leaning to anyone and everyone. He solved a machine learning problem and demonstrated an easy way to be able to do machine learning without even coding. Raju Shreewastava is the founder of Big Data Trunk (www.BigDataTrunk.com), a Big Data Training and consulting firm with offices in the United States. He previously led the data warehouse/business intelligence and B...
The 22nd International Cloud Expo | 1st DXWorld Expo has announced that its Call for Papers is open. Cloud Expo | DXWorld Expo, to be held June 5-7, 2018, at the Javits Center in New York, NY, brings together Cloud Computing, Digital Transformation, Big Data, Internet of Things, DevOps, Machine Learning and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding busin...
Nordstrom is transforming the way that they do business and the cloud is the key to enabling speed and hyper personalized customer experiences. In his session at 21st Cloud Expo, Ken Schow, VP of Engineering at Nordstrom, discussed some of the key learnings and common pitfalls of large enterprises moving to the cloud. This includes strategies around choosing a cloud provider(s), architecture, and lessons learned. In addition, he covered some of the best practices for structured team migration an...
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud ...
22nd International Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, and co-located with the 1st DXWorld Expo will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud ...
DevOps at Cloud Expo – being held June 5-7, 2018, at the Javits Center in New York, NY – announces that its Call for Papers is open. Born out of proven success in agile development, cloud computing, and process automation, DevOps is a macro trend you cannot afford to miss. From showcase success stories from early adopters and web-scale businesses, DevOps is expanding to organizations of all sizes, including the world's largest enterprises – and delivering real results. Among the proven benefits,...
@DevOpsSummit at Cloud Expo, taking place June 5-7, 2018, at the Javits Center in New York City, NY, is co-located with 22nd Cloud Expo | 1st DXWorld Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait...
Cloud Expo | DXWorld Expo have announced the conference tracks for Cloud Expo 2018. Cloud Expo will be held June 5-7, 2018, at the Javits Center in New York City, and November 6-8, 2018, at the Santa Clara Convention Center, Santa Clara, CA. Digital Transformation (DX) is a major focus with the introduction of DX Expo within the program. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive ov...
SYS-CON Events announced today that T-Mobile exhibited at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. As America's Un-carrier, T-Mobile US, Inc., is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to 67.4 million customers who are unwilling to compromise on qua...
SYS-CON Events announced today that Cedexis will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Cedexis is the leader in data-driven enterprise global traffic management. Whether optimizing traffic through datacenters, clouds, CDNs, or any combination, Cedexis solutions drive quality and cost-effectiveness. For more information, please visit https://www.cedexis.com.
SYS-CON Events announced today that Google Cloud has been named “Keynote Sponsor” of SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Companies come to Google Cloud to transform their businesses. Google Cloud’s comprehensive portfolio – from infrastructure to apps to devices – helps enterprises innovate faster, scale smarter, stay secure, and do more with data than ever before.
SYS-CON Events announced today that Vivint to exhibit at SYS-CON's 21st Cloud Expo, which will take place on October 31 through November 2nd 2017 at the Santa Clara Convention Center in Santa Clara, California. As a leading smart home technology provider, Vivint offers home security, energy management, home automation, local cloud storage, and high-speed Internet solutions to more than one million customers throughout the United States and Canada. The end result is a smart home solution that sav...
SYS-CON Events announced today that Opsani will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Opsani is the leading provider of deployment automation systems for running and scaling traditional enterprise applications on container infrastructure.