Stop demanding that top xact must be seen before subxact in decoding.
Manifested as
ERROR: subtransaction logged without previous top-level txn record
this check forbids legit behaviours like
- First xl_xact_assignment record is beyond reading, i.e. earlier
restart_lsn.
- After restart_lsn there is some change of a subxact.
- After that, there is second xl_xact_assignment (for another subxact)
revealing the relationship between top and first subxact.
Such a transaction won't be streamed anyway because we hadn't seen it in
full. Saying for sure whether xact of some record encountered after
the snapshot was deserialized can be streamed or not requires to know
whether it wrote something before deserialization point --if yes, it
hasn't been seen in full and can't be decoded. Snapshot doesn't have such
info, so there is no easy way to relax the check.
Reported-by: Hsu, John
Diagnosed-by: Arseny Sher
Author: Arseny Sher, Amit Kapila
Reviewed-by: Amit Kapila, Dilip Kumar
Backpatch-through: 9.5
Discussion: https://postgr.es/m/AB5978B2-1772-4FEE-A245-74C91704ECB0@amazon.com
Branch
------
REL_12_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/59112f235549171dfc8418edf5184c104e14610c
Modified Files
--------------
contrib/test_decoding/Makefile | 2 +-
.../test_decoding/expected/subxact_without_top.out | 39 ++++++++++++++
.../test_decoding/specs/subxact_without_top.spec | 63 ++++++++++++++++++++++
src/backend/replication/logical/reorderbuffer.c | 3 --
4 files changed, 103 insertions(+), 4 deletions(-)
