This function has been incorrectly marked as a set-returning function
with prorows (estimated number of rows) set to 1 since its creation in
7117685, that introduced non-exclusive backups. There is no need for
that as the function is designed to return only one tuple.
This commit fixes the catalog definition of pg_stop_backup_v2() so as it
is not marked as proretset anymore, with prorows set to 0. This
simplifies its internals by removing one tuplestore (used for one single
record anyway) and by removing all the checks related to a set-returning
function.
Issue found during my quest to simplify some of the logic used in
in-core system functions.
Bump catalog version.
Reviewed-by: Aleksander Alekseev, Kyotaro Horiguchi
Discussion: https://postgr.es/m/Yh8guT78f1Ercfzw@paquier.xyz
This is pretty queasy-making on general principles, and the more so
once you notice that CommitTransactionCommand() is actually stomping
on the values saved by _SPI_commit(). It's okay as long as the
active values didn't change during HoldPinnedPortals(); but that's
a larger assumption than I think we want to make, especially since
the fix is so simple.
Discussion: https://postgr.es/m/1533956.1645731245@sss.pgh.pa.us
This routine is a no-op since dd04e95 from 2003, with a macro kept
around for compatibility purposes. This has led to the same code
patterns being copy-pasted around for no effect, sometimes in confusing
ways like in pg_logical_slot_get_changes_guts() from logical.c where the
code was actually incorrect.
This issue has been discussed on two different threads recently, so
rather than living with this legacy, remove any uses of this routine in
the C code to simplify things. The compatibility macro is kept to avoid
breaking any out-of-core modules that depend on it.
Reported-by: Tatsuhito Kasahara, Justin Pryzby
Author: Tatsuhito Kasahara
Discussion: https://postgr.es/m/20211217200419.GQ17618@telsasoft.com
Discussion: https://postgr.es/m/CAP0=ZVJeeYfAeRfmzqAF2Lumdiv4S4FewyBnZd4DPTrsSQKJKw@mail.gmail.com
In commit 70e81861fa to split xlog.c, I moved the startup code that
updates the state in the control file and prints out the "database
system was not properly shut down" message to the log, but I
accidentally removed the "if (InRecovery)" check around it. As a
result, that message was printed even if the system was cleanly shut
down, also during 'initdb'.
Discussion: https://www.postgresql.org/message-id/3357075.1645031062@sss.pgh.pa.us
FinishWalRecovery() copied the valid part of the last WAL block into a
palloc'd buffer, and the code in StartupXLOG() copied it to the WAL
buffer. But the memcpy in StartupXLOG() copied a full 8kB block, not
just the valid part, i.e. it copied from beyond the end of the buffer.
The invalid part was cleared immediately afterwards, so as long as the
memory was allocated and didn't segfault, it didn't do any harm, but
it can definitely segfault.
Discussion: https://www.postgresql.org/message-id/efc12e32-5af2-3485-5b1d-5af9f707491a@iki.fi
This moves the functions related to performing WAL recovery into the new
xlogrecovery.c source file, leaving xlog.c responsible for maintaining
the WAL buffers, coordinating the startup and switch from recovery to
normal operations, and other miscellaneous stuff that have always been in
xlog.c.
Reviewed-by: Andres Freund, Kyotaro Horiguchi, Robert Haas
Discussion: https://www.postgresql.org/message-id/a31f27b4-a31d-f976-6217-2b03be646ffa%40iki.fi
This is in preparation for the next commit, which will split off
recovery-related code from xlog.c into a new source file. This is the
order that things will happen with the next commit, and the point of
this commit is to make these ordering changes more explicit, while the
next commit mechanically moves the source code to the new file. To aid
review, I added "BEGIN/END function" comments to mark which blocks of
code are moved to which functions in the next commit. They will be gone
in the next commit.
Reviewed-by: Andres Freund, Kyotaro Horiguchi, Robert Haas
Discussion: https://www.postgresql.org/message-id/a31f27b4-a31d-f976-6217-2b03be646ffa%40iki.fi
To tidy up after some recent refactorings in xlog.c. These would be
fixed by the pgindent run we do at the end of the development cycle,
but I want to clean these up now as I'm about to do some more big
refactorings on xlog.c.
As of 1eb6d65, the origin data is optionally stored in a 2PC file
header, with the data filled in EndPrepare() even in the default case
where there is no origin data to add. This was inconsistent with all
the other fields of TwoPhaseFileHeader which are initialized in
StartPrepare(), so move the initialization of origin_lsn and
origin_timestamp there instead. The effect of missing the
initialization at this early stage is only cosmetic based on the current
logic of the code, but could have led to issues in the long-term, and it
is more consistent done this way.
Reported-by: Ranier Vilela
Discussion: https://postgr.es/m/CAEudQAooECJ+gU_RZB-yhioPOV94R4ucoHAf68PiJhLpgpVpBw@mail.gmail.com
Previously, it was really easy to write code that accessed MaxBackends
before we'd actually initialized it, especially when coding up an
extension. To make this less error-prune, introduce a new function
GetMaxBackends() which should be used to obtain the correct value.
This will ERROR if called too early. Demote the global variable to
a file-level static, so that nobody can peak at it directly.
Nathan Bossart. Idea by Andres Freund. Review by Greg Sabino Mullane,
by Michael Paquier (who had doubts about the approach), and by me.
Discussion: http://postgr.es/m/20210802224204.bckcikl45uezv5e4@alap3.anarazel.de
Running a shell command for each file to be archived has a lot of
overhead and may not offer as much error checking as you want, or the
exact semantics that you want. So, offer the option to call a loadable
module for each file to be archived, rather than running a shell command.
Also, add a 'basic_archive' contrib module as an example implementation
that archives to a local directory.
Nathan Bossart, with a little bit of kibitzing by me.
Discussion: http://postgr.es/m/20220202224433.GA1036711@nathanxps13
xlog.h is directly and indirectly #included in a lot of places. With
this change, xloginsert.h is no longer unnecessarily included in the
large number of them that don't need it.
Author: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Discussion: https://postgr.es/m/CALj2ACVe-W+WM5P44N7eG9C2_FmaeM8Dq5aCnD3fHt0Ba=WR6w@mail.gmail.com
WAL replay would cause a hard crash if the timeline expected by a
XLOG_END_OF_RECOVERY, a XLOG_CHECKPOINT_ONLINE, or a
XLOG_CHECKPOINT_SHUTDOWN record is not the same as the timeline being
replayed, using the same error message for all three of them. This
commit changes those error messages to use different wordings, adapted
to each record type, which is useful when it comes to the debugging of
an issue in this area.
Author: Amul Sul
Reviewed-by: Nathan Bossart, Robert Haas
Discussion: https://postgr.es/m/CAAJ_b97i1ZerYC_xW6o_AiDSW5n+sGi8k91Yc8KS8bKWKxjqwQ@mail.gmail.com
This fixes a set of issues that have accumulated over the past months
(or years) in various code areas. Most fixes are related to some recent
additions, as of the development of v15.
Author: Justin Pryzby
Discussion: https://postgr.es/m/20220124030001.GQ23027@telsasoft.com
The logic in charge of writing commit timestamps (enabled with
track_commit_timestamp) for subtransactions had a one-bug bug,
where it would be possible that commit timestamps go missing for the
last subtransaction committed.
While on it, simplify a bit the iteration logic in the loop writing the
commit timestamps, as per suggestions from Kyotaro Horiguchi and Tom
Lane, so as some variable initializations are not part of the loop
itself.
Issue introduced in 73c986a.
Analyzed-by: Alex Kingsborough
Author: Alex Kingsborough, Kyotaro Horiguchi
Discussion: https://postgr.es/m/73A66172-4050-4F2A-B7F1-13508EDA2144@amazon.com
Backpatch-through: 10
This commit moves parallel vacuum related code to a new file
commands/vacuumparallel.c so that any table AM supporting indexes can
utilize parallel vacuum in order to call index AM callbacks (ambulkdelete
and amvacuumcleanup) with parallel workers.
Another reason for this refactoring is that the parallel vacuum isn't
specific to heap so it doesn't make sense to keep this code in
heap/vacuumlazy.c.
Author: Masahiko Sawada, based on suggestion from Andres Freund
Reviewed-by: Hou Zhijie, Amit Kapila, Haiying Tang
Discussion: https://www.postgresql.org/message-id/20211030212101.ae3qcouatwmy7tbr%40alap3.anarazel.de
Instead of referring to target backends by pid, use pgprocno. This
means that we don't have to scan the ProcArray and we can drop some
special case code for dealing with the startup process.
Discussion: https://postgr.es/m/CA%2BhUKGLYRyDaneEwz5Uya_OgFLMx5BgJfkQSD%3Dq9HmwsfRRb-w%40mail.gmail.com
Reviewed-by: Soumyadeep Chakraborty <soumyadeep2007@gmail.com>
Reviewed-by: Ashwin Agrawal <ashwinstar@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
When using replication origins, pg_replication_origin_xact_setup() is an
optional choice to be able to set a LSN and a timestamp to mark the
origin, which would be additionally added to WAL for transaction commits
or aborts (including 2PC transactions). An assertion in the code path
of PREPARE TRANSACTION assumed that this data should always be set, so
it would trigger when using replication origins without setting up an
origin LSN. Some tests are added to cover more this kind of scenario.
Oversight in commit 1eb6d65.
Per discussion with Amit Kapila and Masahiko Sawada.
Discussion: https://postgr.es/m/YbbBfNSvMm5nIINV@paquier.xyz
Backpatch-through: 11
It's not great that RecoveryInProgress() calls InitXLOGAccess(),
because a status inquiry function typically shouldn't have the side
effect of performing initializations. We could fix that by calling
InitXLOGAccess() from some other place, but instead, let's remove it
altogether.
One thing InitXLogAccess() did is initialize wal_segment_size, but it
doesn't need to do that. In the postmaster, PostmasterMain() calls
LocalProcessControlFile(), and all child processes will inherit that
value -- except in EXEC_BACKEND bulds, but then each backend runs
SubPostmasterMain() which also calls LocalProcessControlFile().
The other thing InitXLOGAccess() did is update RedoRecPtr and
doPageWrites, but that's not critical, because all code that uses
them will just retry if it turns out that they've changed. The
only difference is that most code will now see an initial value that
is definitely invalid instead of one that might have just been way
out of date, but that will only happen once per backend lifetime,
so it shouldn't be a big deal.
Patch by me, reviewed by Nathan Bossart, Michael Paquier, Andres
Freund, Heikki Linnakangas, and Álvaro Herrera.
Discussion: http://postgr.es/m/CA+TgmoY7b65qRjzHN_tWUk8B4sJqk1vj1d31uepVzmgPnZKeLg@mail.gmail.com
The idea here is that when a performance problem is known to have
occurred at a certain point in time, it's a good thing if there is
some information available from the logs to help figure out what
might have happened around that time.
This change attracted an above-average amount of dissent, because
it means that a server with default settings will produce some amount
of log output even if nothing has gone wrong. However, by my count,
the mailing list discussion had about twice as many people in favor
of the change as opposed. The reasons for believing that the extra
log output is not an issue in practice are: (1) the rate at which
messages can be generated by this setting is bounded to one every
few minutes on a properly-configured system and (2) production
systems tend to have a lot more junk in the log from that due to
failed connection attempts, ERROR messages generated by application
activity, and the like.
Bharath Rupireddy, reviewed by Fujii Masao and by me. Many other
people commented on the thread, but as far as I can see that was
discussion of the merits of the change rather than review of the
patch.
Discussion: https://postgr.es/m/CALj2ACX-rW_OeDcp4gqrFUAkf1f50Fnh138dmkd0JkvCNQRKGA@mail.gmail.com
Like 5364b357fb did for pg_commit, change the formula used to
determine number of pg_commit_ts buffers, which helps performance with
larger servers.
Discussion: https://postgr.es/m/20210115220744.GA24457@alvherre.pgsql
Reviewed-by: Noah Misch <noah@leadboat.com>
Reviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com>
This commit moves the timestamp computation of the control file within
the routine of src/common/ in charge of updating the backend's control
file, which is shared by multiple frontend tools (pg_rewind,
pg_checksums and pg_resetwal) and the backend itself.
This change has as direct effect to update the control file's timestamp
when writing the control file in pg_rewind and pg_checksums, something
that is helpful to keep track of control file updates for those
operations, something also tracked by the backend at startup within its
logs. This part is arguably a bug, as ControlFileData->time should be
updated each time a new version of the control file is written, but this
is a behavior change so no backpatch is done.
Author: Amul Sul
Reviewed-by: Nathan Bossart, Michael Paquier, Bharath Rupireddy
Discussion: https://postgr.es/m/CAAJ_b97nd_ghRpyFV9Djf9RLXkoTbOUqnocq11WGq9TisX09Fw@mail.gmail.com
Standardize on xoroshiro128** as our basic PRNG algorithm, eliminating
a bunch of platform dependencies as well as fundamentally-obsolete PRNG
code. In addition, this API replacement will ease replacing the
algorithm again in future, should that become necessary.
xoroshiro128** is a few percent slower than the drand48 family,
but it can produce full-width 64-bit random values not only 48-bit,
and it should be much more trustworthy. It's likely to be noticeably
faster than the platform's random(), depending on which platform you
are thinking about; and we can have non-global state vectors easily,
unlike with random(). It is not cryptographically strong, but neither
are the functions it replaces.
Fabien Coelho, reviewed by Dean Rasheed, Aleksander Alekseev, and myself
Discussion: https://postgr.es/m/alpine.DEB.2.22.394.2105241211230.165418@pseudo
In commit ff9f111bce I mixed up inconsistent definitions of the LSN of
the first record in a page, when the previous record ends exactly at the
page boundary. The correct LSN is adjusted to skip the WAL page header;
I failed to use that when setting XLogReaderState->overwrittenRecPtr,
so at WAL replay time VerifyOverwriteContrecord would refuse to let
replay continue past that record.
Backpatch to 10. 9.6 also contains this bug, but it's no longer being
maintained.
Discussion: https://postgr.es/m/45597.1637694259@sss.pgh.pa.us
In most places, the variables necessarily store the same value as the
eponymous members of the XLogReaderState that we use during WAL
replay, because ReadRecord() assigns the values from the structure
members to the global variables just after XLogReadRecord() returns.
However, XLogBeginRead() adjusts the structure members but not the
global variables, so after XLogBeginRead() and before the completion
of XLogReadRecord() the values can differ. Otherwise, they must be
identical. According to my analysis, the only place where either
variable is referenced at a point where it might not have the same
value as the structure member is the refrence to EndRecPtr within
XLogPageRead.
Therefore, at every other place where we are using the global
variable, we can just switch to using the structure member instead,
and remove the global variable. However, we can, and in fact should,
do this in XLogPageRead() as well, because at that point in the code,
the global variable will actually store the start of the record we
want to read - either because it's where the last WAL record ended, or
because the read position has been changed using XLogBeginRead since
the last record was read. The structure member, on the other hand,
will already have been updated to point to the end of the record we
just read. Elsewhere, the latter is what we use as an argument to
emode_for_corrupt_record(), so we should do the same here.
This part of the patch is perhaps a bug fix, but I don't think it has
any important consequences, so no back-patch. The point here is just
to continue to whittle down the entirely excessive use of global
variables in xlog.c.
Discussion: http://postgr.es/m/CA+Tgmoao96EuNeSPd+hspRKcsCddu=b1h-QNRuKfY8VmfNQdfg@mail.gmail.com
rescanLatestTimeLine() contains a guard against switching to
a timeline that forked off from the current one prior to the
current recovery point, but that guard does not work if the
timeline switch occurs before the first WAL recod (which must
be the checkpoint record) is read. Without this patch, an
improper timeline switch is therefore possible in such cases.
This happens because rescanLatestTimeLine() relies on the global
variable EndRecPtr to understand the current position of WAL
replay. However, EndRecPtr at this point in the code contains
the endpoint of the last-replayed record, not the startpoint or
endpoint of the record being replayed now. Thus, before any
records have been replayed, it's zero, which causes the sanity
check to always pass.
To fix, pass down the correct timeline explicitly. The
EndRecPtr value we want is the one from the xlogreader, which
will be the starting position of the record we're about to
try to read, rather than the global variable, which is the
ending position of the last record we successfully read.
They're usually the same, but not in the corner case described
here.
No back-patch, because in v14 and earlier branhes, we were using
the wrong TLI here as well as the wrong LSN. In master, that was
fixed by commit 4a92a1c3d1, but
that and it's prerequisite patches are too invasive to
back-patch for such a minor issue.
Patch by me, reviewed by Amul Sul.
Discussion: http://postgr.es/m/CA+Tgmoao96EuNeSPd+hspRKcsCddu=b1h-QNRuKfY8VmfNQdfg@mail.gmail.com
A couple of spots can benefit from an added errdetail(), which matches
what we were already doing in other places; and those that cannot
withstand errdetail() can get a more descriptive primary message.
Author: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Julien Rouhaud <rjuju123@gmail.com>
Discussion: https://postgr.es/m/CALj2ACV+cX1eM03GfcA=ZMLXh5fSn1X1auJLz3yuS1duPSb9QA@mail.gmail.com
At present, there is an undocumented coding rule that you must call
RecoveryInProgress(), or do something else that results in a call
to InitXLogInsert(), before trying to write WAL. Otherwise, the
WAL construction buffers won't be initialized, resulting in
failures.
Since it's not good to rely on a status inquiry function like
RecoveryInProgress() having the side effect of initializing
critical data structures, instead do the initialization eariler,
when the backend first starts up.
Patch by me. Reviewed by Nathan Bossart and Michael Paquier.
Discussion: http://postgr.es/m/CA+TgmoY7b65qRjzHN_tWUk8B4sJqk1vj1d31uepVzmgPnZKeLg@mail.gmail.com
Buildfarm members kittiwake and tadarida have witnessed errors at this
site. The site discarded key facts. Back-patch to v10 (all supported
versions).
Reviewed by Michael Paquier and Tom Lane.
Discussion: https://postgr.es/m/20211107013157.GB790288@rfd.leadboat.com
Presently, the archive_status directory was scanned for each file to
archive. When there are many status files, say because archive_command
has been failing for a long time, these directory scans can get very
slow. With this change, the archiver remembers several files to archive
during each directory scan, speeding things up.
To ensure timeline history files are archived as quickly as possible,
XLogArchiveNotify() forces the archiver to do a new directory scan as
soon as the .ready file for one is created.
Nathan Bossart, per a long discussion involving many people. It is
not clear to me exactly who out of all those people reviewed this
particular patch.
Discussion: http://postgr.es/m/CA+TgmobhAbs2yabTuTRkJTq_kkC80-+jw=pfpypdOJ7+gAbQbw@mail.gmail.com
Discussion: http://postgr.es/m/620F3CE1-0255-4D66-9D87-0EADE866985A@amazon.com
In XLogCtlData, rename the structure member ThisTimeLineID to
InsertTimeLineID and update the comments to make clear that it's only
expected to be set after recovery is complete.
In StartupXLOG, replace the local variables ThisTimeLineID and
PrevTimeLineID with new local variables replayTLI and newTLI. In the
old scheme, ThisTimeLineID was the replay TLI until we created a new
timeline, and after that the replay TLI was in PrevTimeLineID. Now,
replayTLI is the TLI from which we last replayed WAL throughout the
entire function, and newTLI is either that, or the new timeline created
upon promotion.
Remove some misleading comments from the comment block just above where
recoveryTargetTimeLineGoal and friends are declared. It's become
incorrect, not only because ThisTimeLineID as a variable is now gone,
but also because the rmgr code does not care about ThisTimeLineID and
has not since what used to be the TLI field in the page header was
repurposed to store the page checksum.
Add a comment GetFlushRecPtr that it's only supposed to be used in
normal running, and an assertion to verify that this is so.
Per some ideas from Michael Paquier and some of my own. Review by
Michael Paquier also.
Discussion: http://postgr.es/m/CA+TgmoY1a2d1AnVR3tJcKmGGkhj7GGrwiNwjtKr21dxOuLBzCQ@mail.gmail.com
Quite a few buildfarm animals are warning about this, and lapwing
is actually failing (because -Werror). It's a false positive AFAICS,
so no need to do more than zero the variable to start with.
Discussion: https://postgr.es/m/YYXJnUxgw9dZKxlX@paquier.xyz
StartupXLOG() still has ThisTimeLineID as a local variable, but the
remaining code in xlog.c now needs to the relevant TimeLineID by some
other means. Mostly, this means that we now pass it as a function
parameter to a bunch of functions where we didn't previously.
However, a few cases require special handling:
- In functions that might be called by outside callers who
wouldn't necessarily know what timeline to specify, we get
the timeline ID from shared memory. XLogCtl->ThisTimeLineID
can be used in most cases since recovery is known to have
completed by the time those functions are called. In
xlog_redo(), we can use XLogCtl->replayEndTLI.
- XLogFileClose() needs to know the TLI of the open logfile.
Do that with a new global variable openLogTLI. While
someone could argue that this is just trading one global
variable for another, the new one has a far more narrow
purposes and is referenced in just a few places.
- read_backup_label() now returns the TLI that it obtains
by parsing the backup_label file. Previously, ReadRecord()
could be called to parse the checkpoint record without
ThisTimeLineID having been initialized. Now, the timeline
is passed down, and I didn't want to pass an uninitialized
variable; this change lets us avoid that. The old coding
didn't seem to have any practical consequences that we need
to worry about, but this is cleaner.
- In BootstrapXLOG(), it's just a constant.
Patch by me, reviewed and tested by Michael Paquier, Amul Sul, and
Álvaro Herrera.
Discussion: https://postgr.es/m/CA+TgmobfAAqhfWa1kaFBBFvX+5CjM=7TE=n4r4Q1o2bjbGYBpA@mail.gmail.com
All such code deals with this global variable in one of three ways.
Sometimes the same functions use it in more than one of these ways
at the same time.
First, sometimes it's an implicit argument to one or more functions
being called in xlog.c or elsewhere, and must be set to the
appropriate value before calling those functions lest they
misbehave. In those cases, it is now passed as an explicit argument
instead.
Second, sometimes it's used to obtain the current timeline after
the end of recovery, i.e. the timeline to which WAL is being
written and flushed. Such code now calls GetWALInsertionTimeLine()
or relies on the new out parameter added to GetFlushRecPtr().
Third, sometimes it's used during recovery to store the current
replay timeline. That can change, so such code must generally
update the value before each use. It can still do that, but must
now use a local variable instead.
The net effect of these changes is to reduce by a fair amount the
amount of code that is directly accessing this global variable.
That's good, because history has shown that we don't always think
clearly about which timeline ID it's supposed to contain at any
given point in time, or indeed, whether it has been or needs to
be initialized at any given point in the code.
Patch by me, reviewed and tested by Michael Paquier, Amul Sul, and
Álvaro Herrera.
Discussion: https://postgr.es/m/CA+TgmobfAAqhfWa1kaFBBFvX+5CjM=7TE=n4r4Q1o2bjbGYBpA@mail.gmail.com
We don't modify any shared state in this function which could cause
problems for any concurrent session. This will make it look similar to the
other updates for the same structure (TransactionState) which avoids
confusion for future readers of code.
Author: Dilip Kumar
Reviewed-by: Amit Kapila
Discussion: https://postgr.es/m/E1mSoYz-0007Fh-D9@gemulon.postgresql.org
Commit 0bead9af48 introduced XLOG_INCLUDE_XID flag to indicate that the
WAL record contains subXID-to-topXID association. It uses that flag later
to mark in CurrentTransactionState that top-xid is logged so that we
should not try to log it again with the next WAL record in the current
subtransaction. However, we can use a localized variable to pass that
information.
In passing, change the related function and variable names to make them
consistent with what the code is actually doing.
Author: Dilip Kumar
Reviewed-by: Alvaro Herrera, Amit Kapila
Discussion: https://postgr.es/m/E1mSoYz-0007Fh-D9@gemulon.postgresql.org
Users sometimes get concerned whe they start the server and it
emits a few messages and then doesn't emit any more messages for
a long time. Generally, what's happening is either that the
system is taking a long time to apply WAL, or it's taking a
long time to reset unlogged relations, or it's taking a long
time to fsync the data directory, but it's not easy to tell
which is the case.
To fix that, add a new 'log_startup_progress_interval' setting,
by default 10s. When an operation that is known to be potentially
long-running takes more than this amount of time, we'll log a
status update each time this interval elapses.
To avoid undesirable log chatter, don't log anything about WAL
replay when in standby mode.
Nitin Jadhav and Robert Haas, reviewed by Amul Sul, Bharath
Rupireddy, Justin Pryzby, Michael Paquier, and Álvaro Herrera.
Discussion: https://postgr.es/m/CA+TgmoaHQrgDFOBwgY16XCoMtXxsrVGFB2jNCvb7-ubuEe1MGg@mail.gmail.com
Discussion: https://postgr.es/m/CAMm1aWaHF7VE69572_OLQ+MgpT5RUiUDgF1x5RrtkJBLdpRj3Q@mail.gmail.com
All the code that runs in the startup process to write WAL records
before that's allowed generally is now consecutive, so there's no
reason to shut the facility to write WAL locally off and then turn
it on again three times in a row.
Unfortunately, this requires a slight kludge in the checkpointer,
which needs to separately enable writing WAL in order to write the
checkpoint record. Because that code might run in the same process
as StartupXLOG() if we are in single-user mode, we must save/restore
the state of the LocalXLogInsertAllowed flag. Hopefully, we'll be
able to eliminate this wart in further refactoring, but it's
not too bad anyway.
Amul Sul, with modifications by me.
Discussion: http://postgr.es/m/CAAJ_b97fysj6sRSQEfOHj-y8Jfd5uPqOgO74qast89B4WfD+TA@mail.gmail.com
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