Gary Gregory created LOG4J2-1162:
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Summary: Memory-mapped file appender creates null-padded files.
Key: LOG4J2-1162
URL: https://issues.apache.org/jira/browse/LOG4J2-1162
Project: Log4j 2
Issue Type: Bug
Components: Appenders
Affects Versions: 2.4.1
Environment: Apache Maven 3.3.3
(7994120775791599e205a5524ec3e0dfe41d4a06; 2015-04-22T04:57:37-07:00)
Maven home: C:\Java\apache-maven-3.3.3\bin\..
Java version: 1.7.0_79, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk1.7.0_79\jre
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"
Reporter: Gary Gregory
Memory-mapped file appender creates null-padded files.
If configured my app like this:
{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<!-- Copyright 2014-2015 Rocket Software, Inc. All rights reserved. -->
<Configuration status="WARN" monitorInterval="5">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout noConsoleNoAnsi="true"
pattern="%style{%d}{white} %highlight{%-5level}{TRACE=white}
%style{[%t][%logger]}{white} %highlight{%msg%n%throwable}{TRACE=white}" />
</Console>
<RollingRandomAccessFile name="RollingFile" append="false"
fileName="/test/dv/logs/dv.log-OFF"
filePattern="/test/dv/logs/$${date:yyyy-MM}/dv-%d{yyyy-MM-dd}-%i.log.gz">
<PatternLayout>
<Pattern>%d %-5level [%t][%logger] %msg%n%throwable</Pattern>
</PatternLayout>
<Policies>
<SizeBasedTriggeringPolicy size="100 MB" />
</Policies>
</RollingRandomAccessFile>
<MemoryMappedFile name="MemMapFile" append="false"
fileName="/test/dv/logs/dv.log">
<PatternLayout>
<Pattern>%d %-5level [%t][%logger] %msg%n%throwable</Pattern>
</PatternLayout>
</MemoryMappedFile>
</Appenders>
<Loggers>
<Root level="trace">
<!-- <AppenderRef ref="Console" /> -->
<!-- <AppenderRef ref="RollingFile" /> -->
<AppenderRef ref="MemMapFile" />
</Root>
<Logger name="javax.management" level="INFO" />
<Logger name="sun.rmi" level="INFO" />
<Logger name="com.rs.dv.util.LoggerEnvironmentReporter" level="OFF" />
</Loggers>
<!-- Filters -->
<Filters>
<!-- SQL only -->
<!-- <MarkerFilter marker="DV.SQL" onMatch="ACCEPT" onMismatch="DENY" />
<MarkerFilter marker="DV.SQL.QUERY" onMatch="ACCEPT"
onMismatch="DENY" /> <MarkerFilter marker="DV.SQL.UPDATE"
onMatch="ACCEPT" onMismatch="DENY" /> -->
<!-- No buffer hex dumps -->
<!-- <MarkerFilter marker="DV.BUFFER" onMatch="DENY" onMismatch="NEUTRAL"
/> -->
</Filters>
</Configuration>
{code}
After the app runs, I have a 32 MB log file, with the later 2/3 of the file,
all null bytes.
Clearly, we need to limit what we write out.
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