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https://issues.apache.org/jira/browse/FLINK-1355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14265897#comment-14265897
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Till Rohrmann commented on FLINK-1355:
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The reason why one sees the warning about the logging backend is because there
is no log4j.properties/logback.xml file in ones classpath or one has not
specified a properties file. Technically, then the logging is disabled. To get
rid off these warnings one needs to provide a log4j.properties file. The
problem is that we don't want to ship a predefined logging file with the
binaries, because it could later interfere with a user provided file.
Therefore, there is no configuration file in the resources folder, except for
log4j-test.properties which does not conform to the naming conventions and,
thus, is fine.
If the user runs an example from the command line, then he sees the logging
output (INFO level if he uses the provided log4j.properties file) and the
sysout currently. By disabling the sysout by default, he would only see the
results of the example if run from within the IDE because of the missing
logging file (if not specifically set). If 0.8 is shipped like that, then we
probably should conform to that behavior. I'm just wondering what happens if
the user has a program with a file output. Then he would see nothing as output
from the IDE. Is that the desired behavior?
> Inconsistent Logging/Printing for Examples
> ------------------------------------------
>
> Key: FLINK-1355
> URL: https://issues.apache.org/jira/browse/FLINK-1355
> Project: Flink
> Issue Type: Bug
> Reporter: Stephan Ewen
> Assignee: Till Rohrmann
> Priority: Minor
>
> When running examples from the IDE, I see a warning that no logging backend
> is configured, and I see System.out printing from the client.
> in 0.8, the client's sysout printing is disabled in the local mode.
> We can change it to by default disable logging and enable the client sysout
> output, or vice versa, but I think we should not have both.
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