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Andres Freund 2bef06d516 Preserve required !catalog tuples while computing initial decoding snapshot. ... The logical decoding machinery already preserved all the required catalog tuples, which is sufficient in the course of normal logical decoding, but did not guarantee that non-catalog tuples were preserved during computation of the initial snapshot when creating a slot over the replication protocol. This could cause a corrupted initial snapshot being exported. The time window for issues is usually not terribly large, but on a busy server it's perfectly possible to it hit it. Ongoing decoding is not affected by this bug. To avoid increased overhead for the SQL API, only retain additional tuples when a logical slot is being created over the replication protocol. To do so this commit changes the signature of CreateInitDecodingContext(), but it seems unlikely that it's being used in an extension, so that's probably ok. In a drive-by fix, fix handling of ReplicationSlotsComputeRequiredXmin's already_locked argument, which should only apply to ProcArrayLock, not ReplicationSlotControlLock. Reported-By: Erik Rijkers Analyzed-By: Petr Jelinek Author: Petr Jelinek, heavily editorialized by Andres Freund Reviewed-By: Andres Freund Discussion: https://postgr.es/m/9a897b86-46e1-9915-ee4c-da02e4ff6a95@2ndquadrant.com Backport: 9.4, where logical decoding was introduced.		9 years ago
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access	Rework handling of subtransactions in 2PC recovery	9 years ago
bootstrap	Update copyright via script for 2017	9 years ago
catalog	Change the on-disk format of SCRAM verifiers to conform to RFC 5803.	9 years ago
commands	Identity columns	9 years ago
common	Avoid using a C++ keyword in header file	9 years ago
datatype	Consistently declare timestamp variables as TimestampTz.	9 years ago
executor	Provide an error cursor for "can't call an SRF here" errors.	9 years ago
fe_utils	Allow psql variable substitution to occur in backtick command strings.	9 years ago
foreign	Allow custom and foreign scans to have shutdown callbacks.	9 years ago
lib	Support hashed aggregation with grouping sets.	9 years ago
libpq	Rename "scram" to "scram-sha-256" in pg_hba.conf and password_encryption.	9 years ago
mb	ICU support	9 years ago
nodes	Fix testing of parallel-safety of SubPlans.	9 years ago
optimizer	Optimize joins when the inner relation can be proven unique.	9 years ago
parser	Identity columns	9 years ago
port	Remove symbol WIN32_ONLY_COMPILER	9 years ago
portability	Update copyright via script for 2017	9 years ago
postmaster	Add an Assert() to max_parallel_workers enforcement.	9 years ago
regex	Document intentional violations of header inclusion policy.	9 years ago
replication	Preserve required !catalog tuples while computing initial decoding snapshot.	9 years ago
rewrite	Remove deprecated COMMENT ON RULE syntax	9 years ago
snowball	Document intentional violations of header inclusion policy.	9 years ago
statistics	Collect and use multi-column dependency stats	9 years ago
storage	Preserve required !catalog tuples while computing initial decoding snapshot.	9 years ago
tcop	Remove dead code and fix comments in fast-path function handling.	9 years ago
tsearch	Full Text Search support for json and jsonb	9 years ago
utils	Add max_sync_workers_per_subscription to postgresql.conf.sample.	9 years ago
.gitignore	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	13 years ago
Makefile	Generate fmgr prototypes automatically	9 years ago
c.h	Recommend wrappers of PG_DETOAST_DATUM_PACKED().	9 years ago
fmgr.h	Avoid passing function pointers across process boundaries.	9 years ago
funcapi.h	Update copyright via script for 2017	9 years ago
getaddrinfo.h	Remove symbol WIN32_ONLY_COMPILER	9 years ago
getopt_long.h	Update copyright via script for 2017	9 years ago
miscadmin.h	Update copyright via script for 2017	9 years ago
pg_config.h.in	Revert "Use pselect(2) not select(2), if available, to wait in postmaster's loop."	9 years ago
pg_config.h.win32	Revert "Use pselect(2) not select(2), if available, to wait in postmaster's loop."	9 years ago
pg_config_ext.h.in	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	13 years ago
pg_config_ext.h.win32	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	13 years ago
pg_config_manual.h	Fix default minimum value for descending sequences	9 years ago
pg_getopt.h	Update copyright via script for 2017	9 years ago
pg_trace.h	Update copyright via script for 2017	9 years ago
pgstat.h	Add ProcArrayGroupUpdate wait event.	9 years ago
pgtar.h	Update copyright via script for 2017	9 years ago
pgtime.h	Fix incorrect comment: pgtime's tm_mon is 1-based, not 0-based.	9 years ago
port.h	Run the postmaster's signal handlers without SA_RESTART.	9 years ago
postgres.h	Recommend wrappers of PG_DETOAST_DATUM_PACKED().	9 years ago
postgres_ext.h	Move atooid() definition to a central place	9 years ago
postgres_fe.h	Update copyright via script for 2017	9 years ago
rusagestub.h	Update copyright via script for 2017	9 years ago
windowapi.h	Update copyright via script for 2017	9 years ago