EC pools won't support SYNC reads. This means that TMAP and friends
along with reads from an object class will not be supported.
Signed-off-by: Samuel Just <sam.just@inktank.com>
We don't recover the older versions, so we can't do a rollback.
In general, this is ok since we had enough copies to recover it
in the first place.
Signed-off-by: Samuel Just <sam.just@inktank.com>
We need to be able to allow the PGLog interface user to provide
logic for rolling back and trimming log entries. To that end,
serveral PGLog methods now take a LogEntryHander.
In PGLog::merge_old_entry, if prior_version > info.log_tail and
the object is not missing, we must have rolled back the prior
log entry. Thus, we don't skip the entry.
To simplify the code, _merge_old_entry has been split out as
a const helper. This way, proc_replica_log can be reexpressed
as merging the divergent replica log entries with the fully
merged authoritative log.
Signed-off-by: Samuel Just <sam.just@inktank.com>
RPGTransaction is essentially a wrapped ObjectStore::Transaction.
The coll_t argument is elided, tempness is instead encoded in the
hobject. RPGTransaction tracks which temp objects are created and
cleared so we can update the ReplicatedBackend tracking and possibly
create the temp collection as needed.
Signed-off-by: Samuel Just <sam.just@inktank.com>
PGBackend implmentations will have complete control over the temp
collection. Rather than specifying the collection when sending
ops into the PGBackend, hobjects themselves will be temp or not.
Signed-off-by: Samuel Just <sam.just@inktank.com>
Attribute handling no longer has special support in ContentsGenerator.
The most recent operation information is now stored in a special
attr rather than at the beginning of the object. ObjectDesc layers
include their own ContentsGenerators to allow more flexibility.
Also, writes truncate to the new object size rather than simply
causing reads to stop at that object size.
Signed-off-by: Samuel Just <sam.just@inktank.com>
This flag will cause ReplicatedPG to act as though the
pool were actually an EC pool in that operations will
be restricted to operations which can be locally rolled
back thereby allowing us to test the ReplicatedPG local
log rollback mechanisms independent of EC. It will also
cause ReplicatedPG to use the async read mechanism on
the PGBackend implementation once it is implemented.
Signed-off-by: Samuel Just <sam.just@inktank.com>
Moving up log.tail unnecessarily risks backfilling
a replica after a split. Also, it disrupts the
property that replicas from the most recent interval
which performed writes must have overlapping logs.
Signed-off-by: Samuel Just <sam.just@inktank.com>
Reencode both full and incremental maps if target doesn't know how to
decode OSDMAP_ENC maps (CEPH_FEATURE_OSDMAP_ENC bit is not set). This
fixes a compatibility bug that was introduced in 3d7c69fb09 ("OSDMap:
add a CEPH_FEATURE_OSDMAP_ENC feature, and use new encoding").
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
