I've noticed lately that the file based appenders (e.g. RollingFileAppender)
sometime incur a significantly large delay (compared to the console appender)
when writing log statements to a file. I'm currently experiencing delays of
20-40 seconds, although my process is nearly idle and not doing any other IO.
I'm using more or less default settings for the appender:
<appender name="FILE" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="/tmp/log/test.log"/>
<param name="MaxFileSize" value="150KB"/>
<param name="MaxBackupIndex" value="2"/>
<layout class="org.apache.log4j.xml.XMLLayout">
<param name="locationInfo" value="true"/>
</layout>
</appender>
It offen happens that the output stops in den middle of an XML element which
makes the file useless for parsing (in that state). As far as I understand
the appenders do the IO in their own threads. I'd like to get a little bit
more background information in order to nail down the problem. I've
especially encountered the delay after introducing another thread in my
application.
Olaf
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