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-==================
-PGPool
-==================
-
-PGPool is a structure used to manage and update the status of removed
-snapshots.  It does this by maintaining two fields, cached_removed_snaps - the
-current removed snap set and newly_removed_snaps - newly removed snaps in the
-last epoch. In OSD::load_pgs the osd map is recovered from the pg's file store
-and passed down to OSD::_get_pool where a PGPool object is initialised with the
-map.
-
-With each new map we receive we call PGPool::update with the new map. In that
-function we build a list of newly removed snaps
-(pg_pool_t::build_removed_snaps) and merge that with our cached_removed_snaps.
-This function included checks to make sure we only do this update when things
-have changed or there has been a map gap.
-
-When we activate the pg we initialise the snap trim queue from
-cached_removed_snaps and subtract the purged_snaps we have already purged
-leaving us with the list of snaps that need to be trimmed. Trimming is later
-performed asynchronously by the snap_trim_wq.
-