postgres

Commit Graph

Author	SHA1	Message	Date
Tom Lane	bcbecbce2f	Don't propagate a null subtransaction snapshot up to parent transaction. This oversight could cause logical decoding to fail to decode an outer transaction containing changes, if a subtransaction had an XID but no actual changes. Per bug #14279 from Marko Tiikkaja. Patch by Marko based on analysis by Andrew Gierth. Discussion: <20160804191757.1430.39011@wrigleys.postgresql.org>	10 years ago
Andres Freund	d9e903f3cb	logical decoding: Tell reorderbuffer about all xids. Logical decoding's reorderbuffer keeps transactions in an LSN ordered list for efficiency. To make that's efficiently possible upper-level xids are forced to be logged before nested subtransaction xids. That only works though if these records are all looked at: Unfortunately we didn't do so for e.g. row level locks, which are otherwise uninteresting for logical decoding. This could lead to errors like: "ERROR: subxact logged without previous toplevel record". It's not sufficient to just look at row locking records, the xid could appear first due to a lot of other types of records (which will trigger the transaction to be marked logged with MarkCurrentTransactionIdLoggedIfAny). So invent infrastructure to tell reorderbuffer about xids seen, when they'd otherwise not pass through reorderbuffer.c. Reported-By: Jarred Ward Bug: #13844 Discussion: 20160105033249.1087.66040@wrigleys.postgresql.org Backpatch: 9.4, where logical decoding was added	10 years ago

Author

SHA1

Message

Date

Tom Lane

bcbecbce2f

Don't propagate a null subtransaction snapshot up to parent transaction.

This oversight could cause logical decoding to fail to decode an outer
transaction containing changes, if a subtransaction had an XID but no
actual changes.  Per bug #14279 from Marko Tiikkaja.  Patch by Marko
based on analysis by Andrew Gierth.

Discussion: <20160804191757.1430.39011@wrigleys.postgresql.org>

10 years ago

Andres Freund

d9e903f3cb

logical decoding: Tell reorderbuffer about all xids.

Logical decoding's reorderbuffer keeps transactions in an LSN ordered
list for efficiency. To make that's efficiently possible upper-level
xids are forced to be logged before nested subtransaction xids.  That
only works though if these records are all looked at: Unfortunately we
didn't do so for e.g. row level locks, which are otherwise uninteresting
for logical decoding.

This could lead to errors like:
"ERROR: subxact logged without previous toplevel record".

It's not sufficient to just look at row locking records, the xid could
appear first due to a lot of other types of records (which will trigger
the transaction to be marked logged with MarkCurrentTransactionIdLoggedIfAny).
So invent infrastructure to tell reorderbuffer about xids seen, when
they'd otherwise not pass through reorderbuffer.c.

Reported-By: Jarred Ward
Bug: #13844
Discussion: 20160105033249.1087.66040@wrigleys.postgresql.org
Backpatch: 9.4, where logical decoding was added

10 years ago

2 Commits (39b66a91bdebb00af71a2c6218412ecfc89a0e13)