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Diffstat (limited to 'src/ceph/doc/dev/osd_internals/pgpool.rst')
| -rw-r--r-- | src/ceph/doc/dev/osd_internals/pgpool.rst | 22 |
1 files changed, 0 insertions, 22 deletions
diff --git a/src/ceph/doc/dev/osd_internals/pgpool.rst b/src/ceph/doc/dev/osd_internals/pgpool.rst deleted file mode 100644 index 45a252b..0000000 --- a/src/ceph/doc/dev/osd_internals/pgpool.rst +++ /dev/null @@ -1,22 +0,0 @@ -================== -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. - |