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https://issues.apache.org/jira/browse/FLINK-7990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240166#comment-16240166
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Teena K commented on FLINK-7990:
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Flink 1.3.2 version shows this behavior
> Strange behavior when configuring Logback for logging
> -----------------------------------------------------
>
> Key: FLINK-7990
> URL: https://issues.apache.org/jira/browse/FLINK-7990
> Project: Flink
> Issue Type: Bug
> Components: Configuration, Logging
> Reporter: Fabian Hueske
> Priority: Critical
> Fix For: 1.4.0, 1.3.3
>
>
> The following issue was reported on the [user
> mailinglist|https://lists.apache.org/thread.html/c06a9f0b1189bf21d946d3d9728631295c88bfc57043cdbe18409d52@%3Cuser.flink.apache.org%3E]
> {quote}
> I have a single node Flink instance which has the required jars for logback
> in the lib folder (logback-classic.jar, logback-core.jar,
> log4j-over-slf4j.jar). I have removed the jars for log4j from the lib folder
> (log4j-1.2.17.jar, slf4j-log4j12-1.7.7.jar). 'logback.xml' is also correctly
> updated in 'conf' folder. I have also included 'logback.xml' in the
> classpath, although this does not seem to be considered while the job is run.
> Flink refers to logback.xml inside the conf folder only. I have updated
> pom.xml as per Flink's documentation in order to exclude log4j. I have some
> log entries set inside a few map and flatmap functions and some log entries
> outside those functions (eg: "program execution started").
> When I run the job, Flink writes only those logs that are coded outside the
> transformations. Those logs that are coded inside the transformations (map,
> flatmap etc) are not getting written to the log file. If this was happening
> always, I could have assumed that the Task Manager is not writing the logs.
> But Flink displays a strange behavior regarding this. Whenever I update the
> logback jars inside the the lib folder(due to version changes), during the
> next job run, all logs (even those inside map and flatmap) are written
> correctly into the log file. But the logs don't get written in any of the
> runs after that. This means that my 'logback.xml' file is correct and the
> settings are also correct. But I don't understand why the same settings don't
> work while the same job is run again.
> {quote}
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