Rather than doing manual book keeping to plan the number of tests to run
in each TAP suite, conclude each run with done_testing() summing up the
the number of tests that ran. This removes the need for maintaning and
updating the plan count at the expense of an accurate count of remaining
during the test suite runtime.
This patch has been discussed a number of times, often in the context of
other patches which updates tests, so a larger number of discussions can
be found in the archives.
Reviewed-by: Julien Rouhaud <rjuju123@gmail.com>
Reviewed-by: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/DD399313-3D56-4666-8079-88949DAC870F@yesql.se
LZ4 compression can now be performed on the client using
pg_basebackup -Ft --compress client-lz4, and LZ4 decompression of
a backup compressed on the server can be performed on the client
using pg_basebackup -Fp --compress server-lz4.
Dipesh Pandit, reviewed and tested by Jeevan Ladhe and Tushar Ahuja,
with a few corrections - and some documentation - by me.
Discussion: http://postgr.es/m/CAN1g5_FeDmiA9D8wdG2W6Lkq5CpubxOAqTmd2et9hsinTJtsMQ@mail.gmail.com
LZ4 compression can be a lot faster than gzip compression, so users
may prefer it even if the compression ratio is not as good. We will
want pg_basebackup to support LZ4 compression and decompression on the
client side as well, and there is a pending patch for that, but it's
by a different author, so I am committing this part separately for
that reason.
Jeevan Ladhe, reviewed by Tushar Ahuja and by me.
Discussion: http://postgr.es/m/CANm22Cg9cArXEaYgHVZhCnzPLfqXCZLAzjwTq7Fc0quXRPfbxA@mail.gmail.com
Commit 8e2b6d45a0 added a new unprivileged user for testing
pg_basebackup, but omitted to add them to the cluster's authorized
logins, breaking Windows tests run without using Unix sockets.
When this code executed as superuser it appeared to work because no
system catalog lookups happened, but otherwise it crashes because there
is no transaction environment. Fix that.
Report and code change by me. Test case by Dagfinn Ilmari Mannsåker.
Discussion: http://postgr.es/m/CA+TgmobiKLXne-2AVzYyWRiO8=rChBQ=7ywoxp=2SmcFw=oDDw@mail.gmail.com
Tushar Ahuja discovered that if you use both --compress and --gzip,
or --compress multiple times, the last instance of one of these
options doesn't in all cases overwrite the compression level set by
an earlier option. That's not a serious bug, but it also has nothing
to recommend it. Repair.
Discussion: http://postgr.es/m/CA+TgmoZfP=rsZB_9vDGfhuNgSu_M_09UWu8SjvsP65y_1pQFCg@mail.gmail.com
I intended to include a change to the "skip" count in the test
case, but it didn't get folded into the commit. Do that now,
so that non-zlib builds don't break.
The new file bbstreamer_gzip.c needs <unistd.h> to avoid
complaints about dup() not having a prototype, as per buildfarm
returns.
If you have a low-bandwidth connection between the client and the
server, it's reasonable to want to compress on the server side but
then decompress and extract the backup on the client side. This
commit allows you do to do just that.
Dipesh Pandit, with minor and mostly cosmetic changes by me.
Discussion: http://postgr.es/m/CAN1g5_HiSh8ajUMd4ePtGyCXo89iKZTzaNyzP_qv1eJbi4YHXA@mail.gmail.com
The server expects the compression level to be between 1 and 9, but
Z_DEFAULT_COMPRESSION is -1, so we must not try to send that value
to the server.
Because pg_basebackup's -R option is implemented on the client side,
it can't be used in combination with a backup target. Error out if
someone tries that, instead of silently ignoring the option.
Both issues were reported by Tushar Ahuja; patch by me.
Discussion: http://postgr.es/m/CA+TgmoaMwgdx8HxBjF8hmbohVvPL_0H5LqNrSq0uU+7BKp_Q2A@mail.gmail.com
Commit 0ad8032910 failed to update
the pg_basebackup documentation to mention that "client-" or
"server-" can now be prepended to the compression method name. Fix
it there, and also in the --help output that you get from running
the binary.
Also in the documentation, there's an old issue that the arguments to
--checkpoint shouldn't be marked as parameters, because "fast" and
"spread" are literal strings. Fix that too.
Dagfinn Ilmari Mannsåker, partly as per a report from
Shinoda Noriyoshi.
Discussion: http://postgr.es/m/PH7PR84MB1885C1CF433057807551172BEE5F9@PH7PR84MB1885.NAMPRD84.PROD.OUTLOOK.COM
pg_basebackup's --compression option now lets you write either
"client-gzip" or "server-gzip" instead of just "gzip" to specify
where the compression should be performed. If you write simply
"gzip" it's taken to mean "client-gzip" unless you also use
--target, in which case it is interpreted to mean "server-gzip",
because that's the only thing that makes any sense in that case.
To make this work, the BASE_BACKUP command now takes new
COMPRESSION and COMPRESSION_LEVEL options.
At present, pg_basebackup cannot decompress .gz files, so
server-side compression will cause a failure if (1) -Ft is not
used or (2) -R is used or (3) -D- is used without --no-manifest.
Along the way, I removed the information message added by commit
5c649fe153 which occurred if you
specified no compression level and told you that the default level
had been used instead. That seemed like more output than most
people would want.
Also along the way, this adds a check to the server for
unrecognized base backup options. This repairs a bug introduced
by commit 0ba281cb4b.
This commit also adds some new test cases for pg_verifybackup.
They take a server-side backup with and without compression, and
then extract the backup if we have the OS facilities available
to do so, and then run pg_verifybackup on the extracted
directory. That is a good test of the functionality added by
this commit and also improves test coverage for the backup target
patch (commit 3500ccc39b) and for
pg_verifybackup itself.
Patch by me, with a bug fix by Jeevan Ladhe. The patch set of which
this is a part has also had review and/or testing from Tushar Ahuja,
Suraj Kharage, Dipesh Pandit, and Mark Dilger.
Discussion: http://postgr.es/m/CA+Tgmoa-ST7fMLsVJduOB7Eub=2WjfpHS+QxHVEpUoinf4bOSg@mail.gmail.com
Commit 5c649fe15 introduced a memory leak into pg_basebackup's
parse_compress_options. (I simplified nearby code while at it.)
Commit 9a974cbcb introduced a memory leak into pg_dump's
binary_upgrade_set_pg_class_oids.
Coverity also complained about a call of SnapBuildProcessChange that
ignored the result, unlike every other call of that function. This
is evidently intentional, so add a (void) cast to indicate that.
(It's also old, dating to b89e15105; I suppose the reason it showed
up now is 7a5f6b474's recent rearrangement of nearby code.)
The option --compress is extended to accept a compression method and an
optional compression level, as of the grammar METHOD[:LEVEL]. The
methods currently support are "none" and "gzip", for client-side
compression. Any of those methods use only an integer value for the
compression level, but any method implemented in the future could use
more specific keywords if necessary.
This commit keeps the logic backward-compatible. Hence, the following
compatibility rules apply for the new format of the option --compress:
* -z/--gzip is a synonym of --compress=gzip.
* --compress=NUM implies:
** --compress=none if NUM = 0.
** --compress=gzip:NUM if NUM > 0.
Note that there are also plans to extend more this grammar with
server-side compression.
Reviewed-by: Robert Haas, Magnus Hagander, Álvaro Herrera, David
G. Johnston, Georgios Kokolatos
Discussion: https://postgr.es/m/Yb3GEgWwcu4wZDuA@paquier.xyz
pg_basebackup now has a --target=TARGET[:DETAIL] option. If specfied,
it is sent to the server as the value of the TARGET option to the
BASE_BACKUP command. If DETAIL is included, it is sent as the value of
the new TARGET_DETAIL option to the BASE_BACKUP command. If the
target is anything other than 'client', pg_basebackup assumes that it
will now be the server's job to write the backup in a location somehow
defined by the target, and that it therefore needs to write nothing
locally. However, the server will still send messages to the client
for progress reporting purposes.
On the server side, we now support two additional types of backup
targets. There is a 'blackhole' target, which just throws away the
backup data without doing anything at all with it. Naturally, this
should only be used for testing and debugging purposes, since you will
not actually have a backup when it finishes running. More usefully,
there is also a 'server' target, so you can now use something like
'pg_basebackup -Xnone -t server:/SOME/PATH' to write a backup to some
location on the server. We can extend this to more types of targets
in the future, and might even want to create an extensibility
mechanism for adding new target types.
Since WAL fetching is handled with separate client-side logic, it's
not part of this mechanism; thus, backups with non-default targets
must use -Xnone or -Xfetch.
Patch by me, with a bug fix by Jeevan Ladhe. The patch set of which
this is a part has also had review and/or testing from Tushar Ahuja,
Suraj Kharage, Dipesh Pandit, and Mark Dilger.
Discussion: http://postgr.es/m/CA+TgmoaYZbz0=Yk797aOJwkGJC-LK3iXn+wzzMx7KdwNpZhS5g@mail.gmail.com
In the new approach, all files across all tablespaces are sent in a
single COPY OUT operation. The CopyData messages are no longer raw
archive content; rather, each message is prefixed with a type byte
that describes its purpose, e.g. 'n' signifies the start of a new
archive and 'd' signifies archive or manifest data. This protocol
is significantly more extensible than the old approach, since we can
later create more message types, though not without concern for
backward compatibility.
The new protocol sends a few things to the client that the old one
did not. First, it sends the name of each archive explicitly, instead
of letting the client compute it. This is intended to make it easier
to write future patches that might send archives in a format other
that tar (e.g. cpio, pax, tar.gz). Second, it sends explicit progress
messages rather than allowing the client to assume that progress is
defined by the number of bytes received. This will help with future
features where the server compresses the data, or sends it someplace
directly rather than transmitting it to the client.
The old protocol is still supported for compatibility with previous
releases. The new protocol is selected by means of a new
TARGET option to the BASE_BACKUP command. Currently, the
only supported target is 'client'. Support for additional
targets will be added in a later commit.
Patch by me. The patch set of which this is a part has had review
and/or testing from Jeevan Ladhe, Tushar Ahuja, Suraj Kharage,
Dipesh Pandit, and Mark Dilger.
Discussion: http://postgr.es/m/CA+TgmoaYZbz0=Yk797aOJwkGJC-LK3iXn+wzzMx7KdwNpZhS5g@mail.gmail.com
Most tests invoking pg_basebackup themselves did not yet use -cfast, which
makes pg_basebackup take considerably longer. The only reason this didn't
cause the tests to take many minutes is that spread checkpoints only throttle
when writing out a buffer and there aren't that many dirty buffers in the
tests...
Discussion: https://postgr.es/m/20220117195711.xx4qbxutrrlmo2dg@alap3.anarazel.de
By default, wait_for_catchup() waits for the replication connection
to reach the primary's write LSN. That's fine, but in an apparent
attempt to save one query round-trip, it was coded so that we
executed pg_current_wal_lsn() again during each probe query.
Thus, we presented the standby with a moving target to be reached.
(While the test script itself couldn't be causing the write LSN
to advance while it's blocked in wait_for_catchup(), it's plenty
plausible that background activity such as autovacuum is emitting
more WAL.) That could make the test take longer than necessary,
and potentially it could mask bugs by allowing the standby to process
more WAL than a strict interpretation of the test scenario allows.
So, change wait_for_catchup() to do it "by the book", explicitly
collecting the write LSN to wait for at the outset.
Also, various call sites were instructing wait_for_catchup() to
wait for the standby to reach the primary's insert LSN rather than
its write LSN. This also seems like a bad idea. While in most
test scenarios those are the same, if they are different then the
inserted-but-not-yet-written WAL is not presently available to the
standby. The test isn't doing anything to make it become so, so
again we have the potential for unwanted test delay, perhaps even
a test timeout. (Again, background activity would be needed to
make this more than a hypothetical problem.) Hence, change the
callers where necessary so that the wait target is always the
primary's write LSN.
While at it, simplify callers by making use of wait_for_catchup's
default arguments wherever possible (the preceding change makes
this possible in more places than it was before). And rewrite
wait_for_catchup's documentation a bit.
Patch by me; thanks to Julien Rouhaud for review.
Discussion: https://postgr.es/m/2368336.1641843098@sss.pgh.pa.us
pg_basebackup.c relies on the compression level to not be 0 to decide if
compression should be used, but 000f3adf missed the fact that the
default compression (Z_DEFAULT_COMPRESSION) is -1, which would be used
if specifying --gzip without --compress.
While on it, add some coverage for --gzip, as this is rather easy to
miss.
Reported-by: Christoph Berg
Discussion: https://postgr.es/m/YdhRDMLjabtXOnhY@msg.df7cb.de
pg_basebackup is able to use gzip to compress the contents of backups
with the tar format, but there were no tests for that. This adds a
minimalistic set of tests to check the contents of such base backups,
including sanity checks on the contents generated with gzip commands.
The tests are skipped if Postgres is compiled --without-zlib, and the
checks based on the gzip command are skipped if nothing can be found,
following the same model as the existing tests for pg_receivewal.
Reviewed-by: Georgios Kokolatos
Discussion: https://postgr.es/m/Yb3GEgWwcu4wZDuA@paquier.xyz
Since d62bcc8, the directory method of walmethods.c uses the compression
method to determine which code path to take. The tar method, used by
pg_basebackup --format=t, was inconsistent regarding that, as it relied
on the compression level to check if no compression or gzip should be
used. This commit makes the code more consistent as a whole in this
file, making the tar logic use a compression method rather than
assigning COMPRESSION_NONE that would be ignored.
The options of pg_basebackup are planned to be reworked but we are not
sure yet of the shape they should have as this has some dependency with
the integration of the server-side compression for base backups, so this
is left out for the moment. This change has as benefit to make easier
the future integration of new compression methods for the tar method of
walmethods.c, for the client-side compression.
Reviewed-by: Georgios Kokolatos
Discussion: https://postgr.es/m/Yb3GEgWwcu4wZDuA@paquier.xyz
If an error occurs when writing the LZ4 file header, LZ4F_compressEnd()
was called in the error code path of write(), followed by
LZ4F_freeCompressionContext() to finish the cleanup. The code as-is was
not broken, but the LZ4F_compressEnd() proves to not be necessary as
there are no contents to flush at this stage, so remove it.
Per gripe from Jeevan Ladhe and Robert Haas.
Discussion: https://postgr.es/m/CAOgcT0PE33wbD7giAT1OSkNJt=p-vu8huq++qh=ny9O=SCP5aA@mail.gmail.com
Previously it was impossible to terminate these programs via control-C
while they were prompting for a password. We can fix that trivially
for their initial password prompts, by moving setup of the SIGINT
handler from just before to just after their initial GetConnection()
calls.
This fix doesn't permit escaping out of later re-prompts, but those
should be exceedingly rare, since the user's password or the server's
authentication setup would have to have changed meanwhile. We
considered applying a fix similar to commit 46d665bc2, but that
seemed more complicated than it'd be worth. Moreover, this way is
back-patchable, which that wasn't.
The misbehavior exists in all supported versions, so back-patch to all.
Tom Lane and Nathan Bossart
Discussion: https://postgr.es/m/747443.1635536754@sss.pgh.pa.us
The error handling here was a mess, as a result of a fundamentally
bad design (relying on errno to keep its value much longer than is
safe to assume) as well as a lot of just plain sloppiness, both as
to noticing errors at all and as to reporting the correct errno.
Moreover, the recent addition of LZ4 compression broke things
completely, because liblz4 doesn't use errno to report errors.
To improve matters, keep the error state in the DirectoryMethodData or
TarMethodData struct, and add a string field so we can handle cases
that don't set errno. (The tar methods already had a version of this,
but it can be done more efficiently since all these cases use a
constant error string.) Make the dir and tar methods handle errors
in basically identical ways, which they didn't before.
This requires copying errno into the state struct in a lot of places,
which is a bit tedious, but it has the virtue that we can get rid of
ad-hoc code to save and restore errno in a number of places ... not
to mention that it fixes other places that should've saved/restored
errno but neglected to.
In passing, fix some pointlessly static buffers to be ordinary
local variables.
There remains an issue about exactly how to handle errors from
fsync(), but that seems like material for its own patch.
While the LZ4 problems are new, all the rest of this is fixes for
old bugs, so backpatch to v10 where walmethods.c was introduced.
Patch by me; thanks to Michael Paquier for review.
Discussion: https://postgr.es/m/1343113.1636489231@sss.pgh.pa.us
Coverity complained that applying get_gz_error after a failed gzclose,
as we did in one place in pg_basebackup, is unsafe. I think it's
right: it's entirely likely that the call is touching freed memory.
Change that to inspect errno, as we do for other gzclose calls.
Also, be careful to initialize errno to zero immediately before any
gzclose() call where we care about the error status. (There are
some calls where we don't, because we already failed at some previous
step.) This ensures that we don't get a misleadingly irrelevant
error code if gzclose() fails in a way that doesn't set errno.
We could work harder at that, but it looks to me like all such cases
are basically can't-happen if we're not misusing zlib, so it's
not worth the extra notational cruft that would be required.
Also, fix several places that simply failed to check for close-time
errors at all, mostly at some remove from the close or gzclose itself;
and one place that did check but didn't bother to report the errno.
Back-patch to v12. These mistakes are older than that, but between
the frontend logging API changes that happened in v12 and the fact
that frontend code can't rely on %m before that, the patch would need
substantial revision to work in older branches. It doesn't quite
seem worth the trouble given the lack of related field complaints.
Patch by me; thanks to Michael Paquier for review.
Discussion: https://postgr.es/m/1343113.1636489231@sss.pgh.pa.us
Earlier versions of PostgreSQL featured a version of pg_basebackup
that wanted to edit tar archives but was too dumb to parse them
properly. The server made things easier for the client by failing
to add the two blocks of zero bytes that ought to end a tar file,
leaving it up to the client to do that.
But since commit 23a1c6578c, we
don't need this hack any more, because pg_basebackup is now smarter
and can parse tar files even if they are properly terminated! So
change the server to always properly terminate the tar files. Older
versions of pg_basebackup can't talk to new servers anyway, so
there's no compatibility break.
On the pg_basebackup side, we see still need to add the terminating
zero bytes if we're talking to an older server, but not when the
server is v15+. Hopefully at some point we'll be able to remove
some of this compatibility cruft, but it seems best to hang on to
it for now.
In passing, add a file header comment to bbstreamer_tar.c, to make
it clearer what's going on here.
Discussion: http://postgr.es/m/CA+TgmoZbNzsWwM4BE5Jb_qHncY817DYZwGf+2-7hkMQ27ZwsMQ@mail.gmail.com
Commit 23a1c6578c improved
pg_basebackup's ability to parse tar archives, but also arranged
to parse them only when we need to make some modification to the
contents of the archive. That's a problem, because the server
doesn't actually terminate tar archives. When the new parsing
logic was engaged, pg_basebackup would properly terminate the
tar file, but when it was skipped, pg_basebackup would just write
whatever it got from the server, meaning that the terminator
was missing.
Most versions of tar are willing to overlook the missing terminator, but
the AIX buildfarm animals were not. Fix by inventing a new kind of
bbstreamer that just blindly adds a terminator, and using it whenever we
don't parse the tar archive.
Discussion: http://postgr.es/m/CA+TgmoZbNzsWwM4BE5Jb_qHncY817DYZwGf+2-7hkMQ27ZwsMQ@mail.gmail.com
pg_basebackup knows how to do quite a few things with a backup that it
gets from the server, like just write out the files, or compress them
first, or even parse the tar format and inject a modified
postgresql.auto.conf file into the archive generated by the server.
Unforatunely, this makes pg_basebackup.c a very large source file, and
also somewhat difficult to enhance, because for example the knowledge
that the server is sending us a 'tar' file rather than some other sort
of archive is spread all over the place rather than centralized.
In an effort to improve this situation, this commit invents a new
'bbstreamer' abstraction. Each archive received from the server is
fed to a bbstreamer which may choose to dispose of it or pass it
along to some other bbstreamer. Chunks may also be "labelled"
according to whether they are part of the payload data of a file
in the archive or part of the archive metadata.
So, for example, if we want to take a tar file, modify the
postgresql.auto.conf file it contains, and the gzip the result
and write it out, we can use a bbstreamer_tar_parser to parse the
tar file received from the server, a bbstreamer_recovery_injector
to modify the contents of postgresql.auto.conf, a
bbstreamer_tar_archiver to replace the tar headers for the file
modified in the previous step with newly-built ones that are
correct for the modified file, and a bbstreamer_gzip_writer to
gzip and write the resulting data. Only the objects with "tar"
in the name know anything about the tar archive format, and in
theory we could re-archive using some other format rather than
"tar" if somebody wanted to write the code.
These chances do add a substantial amount of code, but I think the
result is a lot more maintainable and extensible. pg_basebackup.c
itself shrinks by roughly a third, with a lot of the complexity
previously contained there moving into the newly-added files.
Patch by me. The larger patch series of which this is a part has been
reviewed and tested at various times by Andres Freund, Sumanta
Mukherjee, Dilip Kumar, Suraj Kharage, Dipesh Pandit, Tushar Ahuja,
Mark Dilger, Sergei Kornilov, and Jeevan Ladhe.
Discussion: https://postgr.es/m/CA+TgmoZGwR=ZVWFeecncubEyPdwghnvfkkdBe9BLccLSiqdf9Q@mail.gmail.com
Discussion: https://postgr.es/m/CA+TgmoZvqk7UuzxsX1xjJRmMGkqoUGYTZLDCH8SmU1xTPr1Xig@mail.gmail.com
pg_receivewal gains a new option, --compression-method=lz4, available
when the code is compiled with --with-lz4. Similarly to gzip, this
gives the possibility to compress archived WAL segments with LZ4. This
option is not compatible with --compress.
The implementation uses LZ4 frames, and is compatible with simple lz4
commands. Like gzip, using --synchronous ensures that any data will be
flushed to disk within the current .partial segment, so as it is
possible to retrieve as much WAL data as possible even from a
non-completed segment (this requires completing the partial file with
zeros up to the WAL segment size supported by the backend after
decompression, but this is the same as gzip).
The calculation of the streaming start LSN is able to transparently find
and check LZ4-compressed segments. Contrary to gzip where the
uncompressed size is directly stored in the object read, the LZ4 chunk
protocol does not store the uncompressed data by default. There is
contentSize that can be used with LZ4 frames by that would not help if
using an archive that includes segments compressed with the defaults of
a "lz4" command, where this is not stored. So, this commit has taken
the most extensible approach by decompressing the already-archived
segment to check its uncompressed size, through a blank output buffer in
chunks of 64kB (no actual performance difference noticed with 8kB, 16kB
or 32kB, and the operation in itself is actually fast).
Tests have been added to verify the creation and correctness of the
generated LZ4 files. The latter is achieved by the use of command
"lz4", if found in the environment.
The tar-based WAL method in walmethods.c, used now only by
pg_basebackup, does not know yet about LZ4. Its code could be extended
for this purpose.
Author: Georgios Kokolatos
Reviewed-by: Michael Paquier, Jian Guo, Magnus Hagander, Dilip Kumar
Discussion: https://postgr.es/m/ZCm1J5vfyQ2E6dYvXz8si39HQ2gwxSZ3IpYaVgYa3lUwY88SLapx9EEnOf5uEwrddhx2twG7zYKjVeuP5MwZXCNPybtsGouDsAD1o2L_I5E=@pm.me
The option name was incorrect in one of the error messages, and the
short option 'I' was used in the code but we did not intend things to be
this way. While on it, fix the documentation to refer to a "method",
and not a "level.
Oversights in commit d62bcc8, that I have detected after more review of
the LZ4 patch for pg_receivewal.
pg_receivewal includes since cada1af the option --compress, to allow the
compression of WAL segments using gzip, with a value of 0 (the default)
meaning that no compression can be used.
This commit introduces a new option, called --compression-method, able
to use as values "none", the default, and "gzip", to make things more
extensible. The case of --compress=0 becomes fuzzy with this option
layer, so we have made the choice to make pg_receivewal return an error
when using "none" and a non-zero compression level, meaning that the
authorized values of --compress are now [1,9] instead of [0,9]. Not
specifying --compress with "gzip" as compression method makes
pg_receivewal use the default of zlib instead (Z_DEFAULT_COMPRESSION).
The code in charge of finding the streaming start LSN when scanning the
existing archives is refactored and made more extensible. While on it,
rename "compression" to "compression_level" in walmethods.c, to reduce
the confusion with the introduction of the compression method, even if
the tar method used by pg_basebackup does not rely on the compression
method (yet, at least), but just on the compression level (this area
could be improved more, actually).
This is in preparation for an upcoming patch that adds LZ4 support to
pg_receivewal.
Author: Georgios Kokolatos
Reviewed-by: Michael Paquier, Jian Guo, Magnus Hagander, Dilip Kumar,
Robert Haas
Discussion: https://postgr.es/m/ZCm1J5vfyQ2E6dYvXz8si39HQ2gwxSZ3IpYaVgYa3lUwY88SLapx9EEnOf5uEwrddhx2twG7zYKjVeuP5MwZXCNPybtsGouDsAD1o2L_I5E=@pm.me
pg_receivewal is able to follow a timeline switch, but this was not
tested. This test uses an empty archive location with a restart done
from a slot, making its implementation a tad simpler than if we would
reuse an existing archive directory.
Author: Ronan Dunklau
Reviewed-by: Kyotaro Horiguchi, Michael Paquier
Discussion: https://postgr.es/m/18708360.4lzOvYHigE@aivenronan
This commit improves the speed of those tests by 25~30%, using some
simple ideas to reduce the amount of data written by pg_receivewal:
- Use a segment size of 1MB. While reducing the amount of data zeroed
by pg_receivewal for the new segments, this improves the code coverage
with a non-default segment size.
- In the last test involving a slot's restart_lsn, generate a checkpoint
to advance the redo LSN and the WAL retained by the slot created,
reducing the number of segments that need to be archived. This counts
for most of the gain.
- Minimize the amount of data inserted into the dummy table.
Reviewed-by: Ronan Dunklau
Discussion: https://postgr.es/m/YXqYKAdVEqmyTltK@paquier.xyz
Prior to this patch, when running pg_receivewal, the streaming start
point would be the current location of the archives if anything is
found in the local directory where WAL segments are written, and
pg_receivewal would fall back to the current WAL flush location if there
are no archives, as of the result of an IDENTIFY_SYSTEM command.
If for some reason the WAL files from pg_receivewal were moved, it is
better to try a restart where we left at, which is the replication
slot's restart_lsn instead of skipping right to the current flush
location, to avoid holes in the WAL backed up. This commit changes
pg_receivewal to use the following sequence of methods to determine the
starting streaming LSN:
- Scan the local archives.
- Use the slot's restart_lsn, if supported by the backend and if a slot
is defined.
- Fallback to the current flush LSN as reported by IDENTIFY_SYSTEM.
To keep compatibility with older server versions, we only attempt to use
READ_REPLICATION_SLOT if the backend version is at least 15, and
fallback to the older behavior of streaming from the current flush
LSN if the command is not supported.
Some TAP tests are added to cover this feature.
Author: Ronan Dunklau
Reviewed-by: Kyotaro Horiguchi, Michael Paquier, Bharath Rupireddy
Discussion: https://postgr.es/m/18708360.4lzOvYHigE@aivenronan
The five modules in our TAP test framework all had names in the top
level namespace. This is unwise because, even though we're not
exporting them to CPAN, the names can leak, for example if they are
exported by the RPM build process. We therefore move the modules to the
PostgreSQL::Test namespace. In the process PostgresNode is renamed to
Cluster, and TestLib is renamed to Utils. PostgresVersion becomes simply
PostgreSQL::Version, to avoid possible confusion about what it's the
version of.
Discussion: https://postgr.es/m/aede93a4-7d92-ef26-398f-5094944c2504@dunslane.net
Reviewed by Erik Rijkers and Michael Paquier
Make sure that the string parsing is limited by the size of the
destination buffer.
In pg_basebackup the available values sent from the server
is limited to two characters so there was no risk of overflow.
In pg_dump the buffer is bounded by MAXPGPATH, and thus the limit
must be inserted via preprocessor expansion and the buffer increased
by one to account for the terminator. There is no risk of overflow
here, since in this case, the buffer scanned is smaller than the
destination buffer.
Backpatch the pg_basebackup fix to 11 where it was introduced, and
the pg_dump fix all the way down to 9.6.
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/B14D3D7B-F98C-4E20-9459-C122C67647FB@yesql.se
Backpatch-through: 11 and 9.6
Like BASE_BACKUP, CREATE_REPLICATION_SLOT has historically used a
hard-coded syntax. To improve future extensibility, adopt a flexible
options syntax here, too.
In the new syntax, instead of three mutually exclusive options
EXPORT_SNAPSHOT, USE_SNAPSHOT, and NOEXPORT_SNAPSHOT, there is now a single
SNAPSHOT option with three possible values: 'export', 'use', and 'nothing'.
This commit does not remove support for the old syntax. It just adds
the new one as an additional option, makes pg_receivewal,
pg_recvlogical, and walreceiver processes use it.
Patch by me, reviewed by Fabien Coelho, Sergei Kornilov, and
Fujii Masao.
Discussion: http://postgr.es/m/CA+TgmobAczXDRO_Gr2euo_TxgzaH1JxbNxvFx=HYvBinefNH8Q@mail.gmail.com
Discussion: http://postgr.es/m/CA+TgmoZGwR=ZVWFeecncubEyPdwghnvfkkdBe9BLccLSiqdf9Q@mail.gmail.com
Previously, BASE_BACKUP used an entirely hard-coded syntax, but that's
hard to extend. Instead, adopt the same kind of syntax we've used for
SQL commands such as VACUUM, ANALYZE, COPY, and EXPLAIN, where it's
not necessary for all of the option names to be parser keywords.
In the new syntax, most of the options now take an optional Boolean
argument. To match our practice in other in places, the options which
the old syntax called NOWAIT and NOVERIFY_CHECKSUMS options are in the
new syntax called WAIT and VERIFY_CHECKUMS, and the default value is
false. In the new syntax, the FAST option has been replaced by a
CHECKSUM option whose value may be 'fast' or 'spread'.
This commit does not remove support for the old syntax. It just adds
the new one as an additional option, and makes pg_basebackup prefer
the new syntax when the server is new enough to support it.
Patch by me, reviewed and tested by Fabien Coelho, Sergei Kornilov,
Fujii Masao, and Tushar Ahuja.
Discussion: http://postgr.es/m/CA+TgmobAczXDRO_Gr2euo_TxgzaH1JxbNxvFx=HYvBinefNH8Q@mail.gmail.com
Discussion: http://postgr.es/m/CA+TgmoZGwR=ZVWFeecncubEyPdwghnvfkkdBe9BLccLSiqdf9Q@mail.gmail.com
The following things are improved:
- Fetch the system identifier from the source server before any
WAL streaming loop. This triggers extra checks to make sure that
pg_receivewal is still connected to a server with the same system ID
with a correct timeline.
- Switch umask() (for file creation mode mask) and RetrieveWalSegSize()
(to fetch the size of WAL segments) a bit later before the initial
stream attempt. If the connection was done with a database,
pg_receivewal would fail but those commands were still executed, which
was a waste. The slot creation and drop are now done before retrieving
the segment size.
Author: Bharath Rupireddy
Reviewed-by: Ronan Dunklau, Michael Paquier
Discussion: https://postgr.es/m/CALj2ACX00YYeyBfoi55Cy=NrP-FcfMgiYYx1qRUEib3yjCVoaA@mail.gmail.com
A WAL segment closed during a WAL stream for pg_receivewal would
generate incorrect error messages depending on the context, as the file
name used when referring to a WAL segment ignored partial files or the
compression method used. In such cases, the error message generated
(failure on close, seek or rename) would not match a physical file
name. The same code paths are used by pg_basebackup, but it uses no
partial suffix so it is not impacted.
7fbe0c8 has introduced in walmethods.c a callback to get the exact
physical file name used for a given context, this commit makes use of it
to improve those error messages. This could be extended to more code
paths of pg_basebackup/ in the future, if necessary.
Extracted from a larger patch by the same author.
Author: Georgios Kokolatos
Discussion: https://postgr.es/m/ZCm1J5vfyQ2E6dYvXz8si39HQ2gwxSZ3IpYaVgYa3lUwY88SLapx9EEnOf5uEwrddhx2twG7zYKjVeuP5MwZXCNPybtsGouDsAD1o2L_I5E=@pm.me
Daniel Gustafsson
Robert Haas
Andrew Dunstan
Andres Freund
Tom Lane
Michael Paquier
Bruce Momjian
Peter Eisentraut
Tomas Vondra