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https://issues.apache.org/jira/browse/LOG4J2-3490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17544141#comment-17544141
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ASF subversion and git services commented on LOG4J2-3490:
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Commit 1ab0788f61e6d396afc27c28e0cd9063deaa6e13 in logging-log4j2's branch
refs/heads/release-2.x from Ralph Goers
[ https://gitbox.apache.org/repos/asf?p=logging-log4j2.git;h=1ab0788f61 ]
LOG4J2-3490 - The DirectWriteRolloverStrategy was not detecting the correct
index to use during startup
> Inconsistent counting in DirectWriteRolloverStrategy
> ----------------------------------------------------
>
> Key: LOG4J2-3490
> URL: https://issues.apache.org/jira/browse/LOG4J2-3490
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.17.2
> Reporter: Hans
> Assignee: Ralph Goers
> Priority: Major
>
> When several log files already exist, DirectWriteRolloverStrategy has an
> inconsistent counting after restart. E.g. if maxFiles = 2 and in the log
> folder there are two files app-21.log app-22.log, then the first created
> file is app-2.log.
> After a rollover, the next created file name is OK.
> Example configuration
> {code:java}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="warn" name="MyApp" packages="">
> <Appenders>
> <RollingFile name="RollingFile"
> filePattern="logs/app-%i.log">
> <PatternLayout>
> <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
> </PatternLayout>
> <Policies>
> <SizeBasedTriggeringPolicy size="1 kB" />
> </Policies>
> <DirectWriteRolloverStrategy maxFiles="2" />
> </RollingFile>
> </Appenders>
> <Loggers>
> <Root level="INFO">
> <AppenderRef ref="RollingFile" />
> </Root>
> </Loggers>
> </Configuration> {code}
> Just run following Java application several times and you will encounter the
> effect after building up a log file history.
> {code:java}
> package log4jtest;
> import org.apache.logging.log4j.LogManager;
> import org.apache.logging.log4j.Logger;
> public class LogTest
> {
> private static final Logger logger = LogManager.getLogger("HelloWorld");
> public static void main(String[] args) {
> for (int i = 0; i < 15; i++) {
> logger.info("Hello, World!");
> }
> }
> }
> {code}
> May be caused by line 317 of DirectWriteRolloverStrategy
> {code:java}
> final int fileIndex = eligibleFiles.size() > 0 ? (nextIndex > 0 ? nextIndex :
> eligibleFiles.size()) : 1;
> {code}
> which defaults to the number of files when nextIndex is not initialized.
>
>
> {panel:title=Running test application 5 times}
> C:\misc\pt1\ws\log4jtest\logs>ls
> app-1.log
> C:\misc\pt1\ws\log4jtest\logs>ls
> app-1.log app-2.log
> C:\misc\pt1\ws\log4jtest\logs>ls
> app-2.log app-3.log
> C:\misc\pt1\ws\log4jtest\logs>ls
> app-3.log app-4.log
> C:\misc\pt1\ws\log4jtest\logs>ls
> _*app-2.log*_ app-3.log app-4.log
> {panel}
>
>
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