from pysqlite2 import dbapi2 as sqlite3
# The largest supported snapshot format that can be understood.
-FORMAT_VERSION = (0, 2) # LBS Snapshot v0.2
+FORMAT_VERSION = (0, 6) # LBS Snapshot v0.6
# Maximum number of nested indirect references allowed in a snapshot.
MAX_RECURSION_DEPTH = 3
'device': MetadataItem.decode_device,
'user': MetadataItem.decode_user,
'group': MetadataItem.decode_user,
+ 'ctime': MetadataItem.decode_int,
'mtime': MetadataItem.decode_int,
'links': MetadataItem.decode_int,
'inode': MetadataItem.raw_str,
'checksum': MetadataItem.decode_str,
'size': MetadataItem.decode_int,
'contents': MetadataItem.decode_str,
+ 'target': MetadataItem.decode_str,
}
def iterate_metadata(object_store, root):
where snapshotid < (select max(snapshotid)
from snapshots)""")
- # Delete entries in the snapshot_contents table which are for
- # non-existent snapshots.
- cur.execute("""delete from snapshot_contents
+ # Delete entries in the segments_used table which are for non-existent
+ # snapshots.
+ cur.execute("""delete from segments_used
where snapshotid not in
(select snapshotid from snapshots)""")
# Find segments which contain no objects used by any current snapshots,
# and delete them from the segment table.
cur.execute("""delete from segments where segmentid not in
- (select distinct segmentid from snapshot_contents
- natural join block_index)""")
+ (select segmentid from segments_used)""")
# Finally, delete objects contained in non-existent segments. We can't
# simply delete unused objects, since we use the set of unused objects
cur = self.cursor()
- # First step: Mark all unused-and-expired objects with expired = -1,
- # which will cause us to mostly ignore these objects when rebalancing.
- # At the end, we will set these objects to be in group expired = 0.
- # Mark expired objects which still seem to be in use with expired = 0;
- # these objects will later have values set to indicate groupings of
- # objects when repacking.
- cur.execute("""update block_index set expired = -1
- where expired is not null""")
-
+ # Mark all expired objects with expired = 0; these objects will later
+ # have values set to indicate groupings of objects when repacking.
cur.execute("""update block_index set expired = 0
- where expired is not null and blockid in
- (select blockid from snapshot_contents)""")
+ where expired is not null""")
# We will want to aim for at least one full segment for each bucket
# that we eventually create, but don't know how many bytes that should
# segments, but for now don't worry too much about that.) If we can't
# compute an average, it's probably because there are no expired
# segments, so we have no more work to do.
- cur.execute("""select avg(size) from segment_info
+ cur.execute("""select avg(size) from segments
where segmentid in
(select distinct segmentid from block_index
where expired is not null)""")
cutoffs.reverse()
for i in range(len(cutoffs)):
cur.execute("""update block_index set expired = ?
- where round(? - timestamp) > ? and expired >= 0""",
+ where round(? - timestamp) > ?""",
(i, now, cutoffs[i]))
- cur.execute("update block_index set expired = 0 where expired = -1")