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Posted to jira@kafka.apache.org by "Robin Moffatt (JIRA)" <ji...@apache.org> on 2019/07/16 14:51:00 UTC
[jira] [Commented] (KAFKA-3816) Provide more context in Kafka
Connect log messages using MDC
[ https://issues.apache.org/jira/browse/KAFKA-3816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16886183#comment-16886183 ]
Robin Moffatt commented on KAFKA-3816:
--------------------------------------
For completeness, the MDC parameter added in Apache Kafka 2.3 is *{{connector.context}}*, as described in [https://cwiki.apache.org/confluence/display/KAFKA/KIP-449%3A+Add+connector+contexts+to+Connect+worker+logs].
The above references to connector.class / connector.name / connector.scope / connector.task are outdated.
> Provide more context in Kafka Connect log messages using MDC
> ------------------------------------------------------------
>
> Key: KAFKA-3816
> URL: https://issues.apache.org/jira/browse/KAFKA-3816
> Project: Kafka
> Issue Type: Improvement
> Components: KafkaConnect
> Affects Versions: 0.9.0.1
> Reporter: Randall Hauch
> Assignee: Randall Hauch
> Priority: Critical
> Fix For: 2.3.0
>
>
> Currently it is relatively difficult to correlate individual log messages with the various threads and activities that are going on within a Kafka Connect worker, let along a cluster of workers. Log messages should provide more context to make it easier and to allow log scraping tools to coalesce related log messages.
> One simple way to do this is by using _mapped diagnostic contexts_, or MDC. This is supported by the SLF4J API, and by the Logback and Log4J logging frameworks.
> Basically, the framework would be changed so that each thread is configured with one or more MDC parameters using the {{org.slf4j.MDC.put(String,String)}} method in SLF4J. Once that thread is configured, all log messages made using that thread have that context. The logs can then be configured to use those parameters.
> It would be ideal to define a convention for connectors and the Kafka Connect framework. A single set of MDC parameters means that the logging framework can use the specific parameters on its message formats.
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