Sameer Pradhan created LOG4J2-1766:
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Summary: Distinguish between partial and completed .gz archive file
Key: LOG4J2-1766
URL: https://issues.apache.org/jira/browse/LOG4J2-1766
Project: Log4j 2
Issue Type: New Feature
Affects Versions: 2.5
Reporter: Sameer Pradhan
I have the following log configuration.
<RollingRandomAccessFile name="RollingReqAppender"
fileName="/usr/test/req.log"
filePattern="/usr/test/req.log.%d{yyyy-MM-dd-HH}.%i.gz"
immediateFlush="true" append="true">
<PatternLayout>
<Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS Z}%m%n</Pattern>
</PatternLayout>
<Policies>
<SizeBasedTriggeringPolicy size="500 MB"/>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingRandomAccessFile>
When the log is rolled over (based on time or size), it is gzipped. Gzipping
the file takes some time (seconds to minutes depending on load). The problem is
that the file is gzipped in place, and while it is being gzipped, the partially
gzipped file is stored in the same folder with the same name as the final gzip
file. e.g.: /usr/test/req.log.2017-01-03-02.1.gz
This causes problems for the file's consumer, which attempts to process the
partial file. I want to be able to distinguish between a partial gzipped file
and a completed gzipped file. For example, I would like to setup a
configuration that while the file is being gzipped, it is written with a
different name e.g.: /usr/test/req.log.2017-01-03-02.1.gz.temp and once it is
completely gzipped the name is changed to the final name
/usr/test/req.log.2017-01-03-02.1.gz
One way to achieve this is to add a new parameter like
"temporaryCompressedFilePattern" as follows:
<RollingRandomAccessFile name="RollingReqAppender"
fileName="/usr/test/req.log"
filePattern="/usr/test/req.log.%d{yyyy-MM-dd-HH}.%i.gz"
temporaryCompressedFilePattern="/usr/test/req.log.%d{yyyy-MM-dd-HH}.%i.gz.temp"
Another option is to make such behavior the default behavior without adding a
new parameter.
This was first discussed at
http://stackoverflow.com/questions/41457492/partial-gz-file-written-by-log4j2
Creating this feature request as suggested by @rpopma
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