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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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Using Integer value in MDC object

I was using MDC for logging in my spring boot application. Along with that I was also maintaining a graph. I was fetching the values from MDC to draw the graph. It requires Integer values not the string values. I don't want to make use of String…
Pavittar
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How to forward reactive context in to WebClient?

I have MDC context and it is using for logging. I`m starting reactive chain from Scheduler and generating context: private void generateMDCcontext() { UUID uuid = UUID.randomUUID(); MDC.put("requestid", uuid.toString()); } Next, I…
Anton
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How to add MDC when producer logs

I'm trying to set a value into MDC to be shown in every log line but when there's a log.info("") inside kafka producer then the log isn't showing the values I previously added for MDC. I have an interceptor to set a "default-value" for correlationId…
user29662
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Slf4j MDC Keys ordering

I have set key-value pairs in MDC like MDC.put("userid", 1); MDC.put("email", "abc@com"); Logger.info("log statement"); I see that logs sometimes printed with userid=1, email=abc@com and sometimes email=abc@com, userid=1. I see it uses an internal…
Salman
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SpringBoot MDC only for the next log

Small question regarding SpringBoot application, and MDC logs please. I have a very simple SpringBoot web handler: @GetMapping(path = "/mdcOnlyToThisLogPlease") public Mono mdcOnlyToThisLogPlease(@RequestBody Book book) { …
PatPanda
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bottom navigation view doesnt shows fargment unless double click

i fixed the previous error but now this here. fragment isnt visible if i dont click bottom navigation two times. my code: activity_main.xml
wyb253
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Missing context into flatMap

I have some method with reactive chain: log.info("start"); Flux.fromIterable(cards) .flatMap(card -> { log.info("some logs"); return externalService.sendCardInfo(card) …
Anton
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log4j2 MDC data is not being printed for some loggers

After switching to log4j2 via the log4j-1.2-api bridge, I've noticed that MDC data is missing from some log lines. These lines come from a separate logger in the same class. What's puzzling is that this happens randomly – sometimes the MDC data…
pouyan021
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Higher order inline functions, and MDCContext

So I'm trying to write a higher order function that adds Mapped Diagnostic Context (MDC) to a closure that is passed as parameter. There are two ways to make it work. One for non suspending functions (MDC.put) and one for suspending functions…
caeus
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Accessing org.slf4j.MDC with log4j2?

If the library uses slf4j and it puts data into org.slf4j.MDC, can my application (uses this library) that uses log4j2 for logging access the MDC variables set by the library?
Glide
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Can I use together: Zipkin, Sleuth, MDC, ELK, Jaeger?

I really read many articles. I figure out that need to just include a starters in spring boot ))) Can anyone sort it out: is Sleuth create MDC (Mapped Diagnostic Context)? Is sleuth create a record's ID which used by Zipkin? Can I see this ID in…
J.J. Beam
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How to have pre-selected option while construction of dropdown in mdc

i wanted to select a particular option while construction of dropdown. Question: i want to select grapes while construction of dropdown. not after construction. Note: i want to construct it at once(while appending). don't want to select after…
Learner
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logback and MDC

is there a way to log a property from MDC as Integer? I have this pattern in my logback.xml, { "level": "%level", "maz": { "tenant": "%mdc{tenant}", "login": "%mdc{login}", "process": "backend" }, "http": { …
monica millad
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Apply aspect on ForkJoinPool method (non-spring managed bean)

I want to copy and set MDC context map to thread which is managed by ForkJoinPool in spring application. Unfortunetly I cannot add aop on execute method because ForkJoinPool is non managed spring bean. I cannot also apply aop on ForkJoinTask. Do you…
Piotr
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How to add user id taken from JWT to the backend logs via MDC?

We have a spring boot application with REST interface and a web client. We are using spring-security with OAuth 2.0 JWT tokens for authentication. We are using slf4j and sleuth for logging. We want to log the currently logged-in user id in our logs.…
scito
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