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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

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mar file generation in MDC

I am trying to generate complete.mar file, in firefox build. when I try to generate complete.mar file, the following error occurs. Sathi@HREF-22F4E8F33B /c/href/FF-5.1/tools/update-packaging $ sh make_full_update.sh complete.mar…
Sathibabu
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GRPC Java: Populate/Clear the MDC on every request/message

Given a GRPC service (no matter if it is a simple RPC or uni/bidirectional service) how to correctly deal with the MDC? I thought I'd implement a Server Interceptor where: Needed fields are retrieved from metadata (headers) (ex. correalation-id) A…
javacomelava
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Why MDC & MDCContext happened in an unexpected ran? The data slips

I wanted to create a context-based logger in a reactive Spring environment using Kotlin coroutines. Using configuration: https://github.com/archie-swif/webflux-mdc/tree/master/src/main/java/com/example/webfluxmdc I have created a GitHub…
Numichi
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MDC for scala play framework 2.7+

How can I configure MDC for play 2.7+, 2.8+? https://www.playframework.com/documentation/2.8.x/ScalaLogging Is "Marker" a replacement for MDC?
Capacytron
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Log request id with SLF4J MDC in Spring webflux with coroutines

I am trying to log the request id and other properties like request path from requests to the Spring webflux endpoint with RouterFunctions. The issue is when I put in the MDC information it gets lost at some point for example when making a database…
MrAndre
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Missing correlationId in logs in spring integration application after a HTTP call made in spring configuration file

In one of the spring integration application, I am trying to print correlationId (which I will get in the headers as "x-correlation-id"="postman") in logs using log4j and MDC. Please find the below spring web filter to intercept the incoming request…
prudhvin000
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How do I import all MDC packages individually rather than as material-components-web?

I am at the optimisation stage and have, up to this point, been importing material-components-web. Now, I want to import the entire library as separate packages so that I can comment out the modules that I'm not using. So, I read the docs and added…
OinkQuack
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Spring AOP MDC Logging not working as expected

In my code, I have 2 methods processInbound() and processOutbound(). I am trying to use AOP to load MDC data so that in the logs I can identify the journey. My code is working as I can see the desired journey details in the log. Following is my…
SMAR
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ConsumerInterceptor For Batch KafkaListener

my consumer configuration has kafka batch listener configs and @KafkaListener consume list of messages. I have a ConsumerInterceptor and I want to set unique id for each record and i store its value in Mapped Diagnostic Context (MDC). If my kafka…
user3142663
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Why LogbackMDC keep track of last operation?

I am looking at the implementation of LogbackMDCAdapter, and it keeps track of lastOperation I don't understand the reason for doing this, anyone has an idea why this is done? And, why duplicateAndInsertNewMap is required?
Vishrant
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How to pass object across methods using Thread context?

I want to pass objects between methods within a thread without using a method signature. Example: public class Controller { @GET public void requestController() { // set user data in the controller currentThread } } public…
Vishrant
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How to use RequestContext custom attributes of armeria in log4j2.xml configuration?

I'm using log4j2 2.14.0 with armeria 1.3.0. According to the armeria documentation, I could see RequestContext custom atrributes can be exported using com.linecorp.armeria.common.logback.RequestContextExportingAppender in logback configuration. So,…
chacha
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HttpClient sendAsync losing MDC logging information

I am using MDC Logger, which works correctly everywhere apart from when I'm sending a request using HttpClient async. The MDC data is not getting passed to next thread and which means they are not on ours logs. How am I able to get the new thread to…
wolfe111
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log4j2 - Can one appender manage more than 1 file "simultaneously"?

I want to create an appender that logs each user actions into a different file per user using the MDC / ThreadContext to save the user name and use it to name the file later on. So for User1 we'd have "web_debug_user1_yyyy-MM-DD", for user2…
Isidro.rn
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Spring Integration MDC for Async Flow and Task Executors

I have a flow that starts with a poller and hands off the message to several async flows downstream using task-executors to execute in parallel for a given dataset. A downstream aggregator completes the flow and notifies the poller that the flow is…
Nikhil
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