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https://issues.apache.org/jira/browse/LOG4J2-3457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17515433#comment-17515433
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Ralph Goers commented on LOG4J2-3457:
-------------------------------------
[~pkarwasz] RollingFileAppender does not expose the locking parameter on
purpose. The reason for this is that rolling is not safe as it is likely to
want to be performed by all the servers at the same time. When I read d the
code it looked like the ".roll" file is being used as a sort of lock. It is
created at the beginning of a rollover so other processes can see that it is
already in progress. Those processes would need to change their output streams
to point to the new file once rollover is complete.
That said, I agree with your conclusion.
> Log4j 1.x 2.17.2 bridge - Does standard RollingFileAppender supports multiple
> process writing to same log file at the same time??
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-3457
> URL: https://issues.apache.org/jira/browse/LOG4J2-3457
> Project: Log4j 2
> Issue Type: Question
> Components: Log4j 1.2 bridge
> Affects Versions: 2.17.2
> Reporter: Pooja Pandey
> Assignee: Piotr Karwasz
> Priority: Major
> Attachments:
> CitedText-RollingFileAppenderNoSupportForMultProcessWritingToSameFile.PNG,
> CustomLogger.java, CustomLoggerFactory.java,
> CustomMultiProcessRollingAppender.java, JavaLoggingMultiThTest.java,
> customlog.properties
>
>
> In our application we require a rolling file appender which can be used
> across multiple processes targeting the same file.
> I wanted to check if current log4j1.x 2.17.2 bridge version supports multi
> process rolling file appender, if not then is there any plan to support this
> feature in future releases??
> For reference, as per our application requirement, I am attaching sample java
> class files for custom appender, custom multi process rolling appender,
> sample test program with multiple threads for which we can run multiple
> instances to test multi process rolling and log4j property
> file.[^CustomLogger.java][^JavaLoggingMultiThTest.java][^customlog.properties]
>
> In one of the mail chain to group Log4J Users List
> <[email protected]>, [~ralphgoers] pointed out that
> {color:#ff0000}_"FWIW the Log4j 2 RollingFileAppender does not support being
> used across multiple processes targeting the same file either. I’d love to
> know how you avoided having the file roll multiple times (once for each
> process)"_{color}.
> !CitedText-RollingFileAppenderNoSupportForMultProcessWritingToSameFile.PNG|width=756,height=434!
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