You can trigger the compactor using the CLI and REST API to purge recalled data on the MapR cluster or to purge stale data on the tier. See Data Compaction for more information.
maprcli volume compact -name <volName> -forcerecallexpiry truecurl -k -X POST 'https://<host>:8443/rest/volume/compact?name=<volName>&forcerecallexpiry=true' --user mapr:maprvolume compact.maprcli volume compact -name <volName>curl -k -X POST 'https://<host>:8443/rest/volume/compact?name=<volName>' --user mapr:maprvolume compact.