##fbitexpire
###Tool description
This tool is used to control free disk space and remove old FastBit data if needed. It consist of several parts.
###Watcher
Watcher thread uses inotify (inotify-cxx, it is included within tool sources) events to register newly created folders and informs scanner about their existence.
###Scanner
Scanner keeps directory tree with informations about their size and age (time last modified). If disk usage reaches given limit it removes the oldest folder(s) from tree and tells cleaner to remove them from disk.
###Cleaner
Simple part which waits on request from scanner and removes folders.
###PipeListener
You can communicate with fbitexpire on it's pipe. PipeListener parses these messages and informs other parts about changes etc.
These requests can be send into pipe:
- to stop fbitexpire
- to rescan some directory
- to change maximal size limit on the fly
- to change watermark limit (the lower limit when removing old folders) on the fly
###Example
fbitexpire -d 4 -s 5000 /data/collector/Watch subdirectories at /data/collector. Depth is set to 4 so we watch directories of maximal depth /data/collector/1/2/3/4. Watched size is 5GB.
fbitexpire -c -s 53G -w 250M -p /tmp/expirepipeChange settings of fbitexpire listening on pipe /tmp/expirepipe. Change size to 53 GB and watermark limit to 250 MB.