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| -rw-r--r-- | doc/dev/osd_internals/snaps.rst | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/doc/dev/osd_internals/snaps.rst b/doc/dev/osd_internals/snaps.rst index a1e9020ba02..63b1bc0503c 100644 --- a/doc/dev/osd_internals/snaps.rst +++ b/doc/dev/osd_internals/snaps.rst @@ -70,18 +70,19 @@ See ReplicatedPG::SnapTrimmer, SnapMapper This trimming is performed asynchronously by the snap_trim_wq while the pg is clean and not scrubbing. - 1. The next snap in PG::snaptrimq is selected for trimming - 2. We determine the next object for trimming out of PG::snap_mapper. + #. The next snap in PG::snaptrimq is selected for trimming + #. We determine the next object for trimming out of PG::snap_mapper. For each object, we create a log entry and repop updating the object info and the snap set (including adjusting the overlaps). - 3. We also locally update our *SnapMapper* instance with the object's + #. We also locally update our *SnapMapper* instance with the object's new snaps. - 4. The log entry containing the modification of the object also + #. The log entry containing the modification of the object also contains the new set of snaps, which the replica uses to update its own *SnapMapper* instance. - 6. The primary shares the info with the replica, which persists + #. The primary shares the info with the replica, which persists the new set of purged_snaps along with the rest of the info. + Recovery -------- Because the trim operations are implemented using repops and log entries, |