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The Witness, The Watchman, and The Agent
By: Larry Dragich
Jul. 20, 2015 09:45 AM
In the world of Application Performance Management (APM) it is always better to enlist more than one entity to help solve the mystery of performance problems.
It's kind of like arriving at the scene of the crime on foreign soil, being blindfolded, shoved out the door, and then asked to help solve the injustice without any insight. All you can do is begin by asking people in the vicinity, providing you speak their language, for information on what they have seen (i.e. end-user-experience).
Gathering facts related to a crime is essential, and can be likened to utilizing an APM solution for solving application performance problems. The more information about an application's behavior that you can obtain, along with understanding its idiosyncrasies within the environment, the more likely you will be able to pinpoint root causes of performance issues.
The Three People You Need
In much the same way a smart APM strategy enlists the help from these three entities: the Witness, the Watchman, and the Agent. You start by listening to the testimony from the eye-witness (aka. wire data), collecting the observations from the watchman (aka web robots), and analyzing details from the agent (aka code level instrumentation).
The Witness -
The Witness will tell you how many people were involved, if anyone was injured, and what time the event occurred, (e.g. user names, packet loss, timelines, etc.). She can tell you what doors the people went through, how wide the aisles were, and how fast people were traveling, (e.g., network port listeners, realized bandwidth, round-trip-time, etc.).
The Watchman -
The Watchman will report the status of the rooms and buildings on his patrol and will note if anything happens to him along the way, (e.g. application availability, transaction errors, timeouts, etc.).
The Agent -
His approach will be to deploy probes on rooftops and inside the buildings for monitoring all conversations and actions in the environment, (aka. application code instrumentation). He will also tap the communication systems, (i.e. script injection) when appropriate and capture specific measurements from each conversation and record them.
Going from Red to Green
To read the full article on the Pulse click here: Slow Application Are Criminal
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