[jira] [Created] (LOG4J2-3114) Wrong value "false" of RollingFileAppender.immediateFlush when configured from a Log4j 1.x configuration

["Barnabas Bodnar (Jira)" <ji...@apache.org>]

Barnabas Bodnar created LOG4J2-3114:
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             Summary: Wrong value "false" of RollingFileAppender.immediateFlush when configured from a Log4j 1.x configuration
                 Key: LOG4J2-3114
                 URL: https://issues.apache.org/jira/browse/LOG4J2-3114
             Project: Log4j 2
          Issue Type: Bug
          Components: Appenders
    Affects Versions: 2.14.1
            Reporter: Barnabas Bodnar
         Attachments: rolling-file-not-flushed.tgz

Unlike the simple FileAppender (both from a Log4j 1.x and 2.x configuration) and the RollingFileAppender configured from a 2.x configuration, the property "immediateFlush" has the value "false" on RollingFileAppender configured from a Log4j 1.x configuration. This leads to apparently not logging into the file (the automatic flush occurs only after a high amount of data and respectively a long time).

The code reveals two relevant differences:
 # "immediateFlush" has the fixed default-value "false" in the 1.x configuration-flow (see for eg.
{code:java}
org.apache.log4j.builders.appender.RollingFileAppenderBuilder.parseAppender(){code}
, the same as in
{code:java}
org.apache.log4j.builders.appender.FileAppenderBuilder.parseAppender(){code}
), unlike in the 2.x configuration-flow (
{code:java}
org.apache.log4j.core.appender.AbstractOutputStreamAppender.Builder.immediateFlush{code}
has the default-value "true")

 # the value of "immediateFlush" is taken from
{code:java}
!bufferedIo || isImmediateFlush(){code}
for a FileAppender, which is missing from the RollingFileAppender

 

To reproduce, build and start the attached demo-application (initializes Log4j2 from a Log4j 1.x configuration and prints periodically a log-entry to the console, to a FileAppender and to a RollingFileAppender). Execute "tail -f" on the file of the simple appender (log.log) and on that of the rolling appender (rlog.log) and observe, that logging output doesn't appear on the latter, until the application is stopped.



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