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Questions tagged [mdc]

MDC (*mapped diagnostic context*) is a way to attach thread-scoped named identifier that can be added to every log message from that thread.

It is used to provide log messages with information that is unavailable to the scope when log is written.It provides the thread and user context to log messages and hence stamp each log for better tracking.

For example, it can help put Correlation Id to a request’s logs to help filter it out from similar logs at that time (from other quests) and also track it easily when this request hop from service to service by sharing the Correlation Id.

Typical use cases

Useful links

288 questions
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Log the value of a Spring Cloud Sleuth Baggage in the current Span Context

I have a Spring Boot app (version 2.1.3.RELEASE) using Spring Cloud Sleuth and I would like to log the value of a baggage in the current Span Context. I am using Logback. My logger has this logback configuration:
calembredaine
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Jest says SyntaxError: Unexpected token export - React, Material.io

I am using React, Google Material IO Components to build an app. From a while when I am running JEST for my tests I see this error mentioned below. Jest encountered an unexpected token This usually means that you are trying to import a file which…
Shiv Kumar Ganesh
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How to intercept Runnable creation and execution under master thread to populate context flow data using AspectJ

Original issue Populate the Java MDC from a thread to all its spawned inner threads (parent to children relation) WIP solution using AspectJ I'm able to write an aspect intercepting all Runnable creation but since I want a different aspect instance…
Jeep87c
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Logstash/Gelf not stored all MDCs

I'm using Logstash/Gelf as a log-tools in my application. I follow this sample for setting up my logger as JSON file. here is my wildfly config (standalone.xml): …
Morteza Asadi
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Jboss logger clear MDC during thread lifecycle

I need to improve logging in a JavaEE application running on wildfly using jboss logger & logstash, I'm using MDC to store userID but as I'm new with thread usage I'm not figuring out how to clear the MDC before a thread is recycled I have found…
Aliiiiiiii
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Is MDC only for logging?

I am aware that MDC is provided by Log4j and is used for the purpose of grouping the related log messages together aiming easier debugging. But, should MDC only used for that purpose? Is it considered to be a bad practice if I use MDC for keeping…
vigamage
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Custom CorrelationId Spring cloud sleuth Finchley.RELEASE

I am currently stuck with one use case in spring-cloud-sleuth. I am using Finchley.Release spring cloud in my pom and Spring boot 2.0.3.RELEASEץ I implemented my own CustomTraceContext which extends CurrentTraceContext and have added a custom…
Harish Salaka
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Show Is Not A Function At HTMLButtonElement Error

I am following this codepen which works perfectly. I took the code from it and put it in my local HTML file and added the JS. However when I run it locally it doesn't work. The console prints out the following message: Uncaught TypeError:…
user3248346
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Spring integration - log each message with mdc to able to aggregate the messages

I am using SpringIntegration's IntegrationFlows to define the message flow, and used Jms.messageDrivenChannelAdapter to get the message from the MQ, now I need to parse it, send it to KAFKA and update couchbase. IntegrationFlows …
Developer
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Using Spring's Sleuth for MDC when working with other microservices frameworks

The Spring's Sleuth seems like a good solution for MDC (Mapped Diagnostic Context) when working with only Spring Boot microservices. But we are wondering if it can useful when every microservice is built with a different framework (dropwizard, java…
riorio
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MDC is not Effective other than Filter in Spring Boot App

I am using MDC for logging sessionId for each request to my spring boot app. I am using log4j2 for logging. When I am putting any key in Filter for example following is my Filter class. import java.io.IOException; import…
Mohit Thakral
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SLF4J MDC: Data "bleeding" from child thread to parent thread

I have a Spring MVC app that has logging set up using SLF4J. I am using two different aspects (using spring-aop) to do the logging, one to log all incoming http requests, and another to log asynchronous tasks. The asynchronous tasks are launched…
Robert Bowen
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MDC logging changing the positions of values

I got log message like this: %d{yyyy-MM-dd HH:mm:ss} %level %logger{0} %mdc - %msg %n 2018-03-22 13:17:47 INFO SomeController [X-Span-Export=false, method=someMethod(), X-B3-SpanId=deef3c47193ec4a6, …
KiKo
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MDC + AspectJ find a pointcut to catch all method calling based on variable name

I would like to log in multitenant (Java Spring with Akka) application. Each logline should contain the tenant id, I found that the MDC looks perfect for this purpose. I use akka.event.Logging for actors, and SLF4J (org.slf4j.Logger) for other parts…
user2695543
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