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Levin Zimmermann
neoppod
Commits
dd556379
Commit
dd556379
authored
Aug 20, 2012
by
Julien Muchembled
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Comment about backup limitations
parent
8832bd42
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TODO
TODO
+5
-0
neo/master/backup_app.py
neo/master/backup_app.py
+3
-0
neo/storage/replicator.py
neo/storage/replicator.py
+2
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TODO
View file @
dd556379
...
...
@@ -85,6 +85,11 @@ RC - Review output of pylint (CODE)
Currently, storage presence is broadcasted to client nodes too early, as
the storage node would refuse them until it has only up-to-date data (not
only up-to-date cells, but also a partition table and node states).
- In backup mode, 2 simultaneous replication should be possible so that:
- outdated cells does not block backup for too long time
- constantly modified partitions does not prevent outdated cells to
replicate
Current behaviour is undefined and the above 2 scenarios may happen.
- Create a specialized PartitionTable that know the database and replicator
to remove duplicates and remove logic from handlers (CODE)
- Consider insert multiple objects at time in the database, with taking care
...
...
neo/master/backup_app.py
View file @
dd556379
...
...
@@ -141,6 +141,9 @@ class BackupApplication(object):
tid
=
app
.
backup_tid
# Wait for non-primary partitions to catch up,
# so that all UP_TO_DATE cells are really UP_TO_DATE.
# XXX: Another possibility could be to outdate such cells, and
# they would be quickly updated at the beginning of the
# RUNNING phase. This may simplify code.
# Any unfinished replication from upstream will be truncated.
while
pt
.
getCheckTid
(
xrange
(
pt
.
getPartitions
()))
<
tid
:
poll
(
1
)
...
...
neo/storage/replicator.py
View file @
dd556379
...
...
@@ -227,6 +227,8 @@ class Replicator(object):
return
app
=
self
.
app
# Choose a partition with no unfinished transaction if possible.
# XXX: When leaving backup mode, we should only consider UP_TO_DATE
# cells when leaving backup mode.
for
offset
in
self
.
replicate_dict
:
if
not
self
.
partition_dict
[
offset
].
max_ttid
:
break
...
...
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