Hi, I'm using SiftingAppender on top of an appender that uses compression. When using a variable (like username) that will show up more than once, it works great. But when using a session id which is unique, then the log file will not be triggered for compression leading to larger disk usage. Is there a way to go about triggering the file to be compressed when the SiftingAppender closes the child appender after it's timeout period? Definition of my appender: <appender name="SIFT-SESSION_ID" class="ch.qos.logback.classic.sift.SiftingAppender"> <discriminator class="ch.qos.logback.classic.sift.MDCBasedDiscriminator"> <key>SESSION_ID</key> <defaultValue>unknown</defaultValue> </discriminator> <sift> <appender name="FILE-${SESSION_ID}" class="ch.qos.logback.core.rolling.RollingFileAppender"> <encoder> <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS zz} %-5level [%thread] %logger{35} - %msg%n%xEx{full}</pattern> </encoder> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>${CONTEXT_DATA_PATH}/logs/session/session-${SESSION_ID}.%d{yyyy-MM-dd}.%i.txt.zip</fileNamePattern> <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"> <maxFileSize>100MB</maxFileSize> </timeBasedFileNamingAndTriggeringPolicy> </rollingPolicy> </appender> </sift> </appender> Thanks! -- TJ