== PostgreSQL Weekly News - April 19 2015 ==
David Fetter <david <at> fetter.org>
2015-04-19 23:25:55 GMT
== PostgreSQL Weekly News - April 19 2015 ==
== PostgreSQL Product News ==
Ora2PG 15.2, a migration system for moving from Oracle to PostgreSQL, released.
pgBadger 6.4, a parallel PostgreSQL log analyzer written in Perl, released:
pgFormatter v1.4, a SQL formatter/beautifier which supports keywords
from SQL-92, SQL-99, SQL-2003, SQL-2008, SQL-2011 and PostgreSQL
keywords are not in the standard, released.
pg_monz v2.0, a Zabbix template for monitoring PostgreSQL, released.
== PostgreSQL Jobs for April ==
== PostgreSQL Local ==
The 4th Turkish PostgreSQL Conference will be held on May 9, 2015 in
The second Swiss Postgres Conference will be held June 25-26, 2015 at
There is a Postgres track in a database technology conference(DTCC) in
April 18, 2015 in Beijing, China.
pgDay Paris will be held in Paris France on April 21, 2015.
Call for Papers for PGDay in Belfort, France ends April 13, 2015.
The conference will be held June 2, 2015.
PGCon 2015 is June 16-20 in Ottawa, Canada.
PGDay UK, Conference will be taking place on 7th July 2015 – it is aimed at
the UK PostgreSQL Community. The CfP is open until 13 April 2015.
The Call For Papers for PostgresOpen 2015, being held in Dallas, Texas
from September 16th to 18th, is now open.
== PostgreSQL in the News ==
Planet PostgreSQL: http://planet.postgresql.org/
PostgreSQL Weekly News is brought to you this week by David Fetter
Submit news and announcements by Sunday at 3:00pm Pacific time.
Please send English language ones to david <at> fetter.org, German language
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== Applied Patches ==
Peter Eisentraut pushed:
- emacs: Set indent-tabs-mode in perl-mode This matches existing
practice, but makes the setup complete and consistent with the C
- Move pgbench from contrib/ to src/bin/. Reviewed-by: Michael
Paquier <michael.paquier <at> gmail.com>
- pgbench: Attempt fix build on Windows
- Move pg_upgrade from contrib/ to src/bin/. Reviewed-by: Michael
Paquier <michael.paquier <at> gmail.com>
- Integrate pg_upgrade_support module into backend. Previously, these
functions were created in a schema "binary_upgrade", which was
deleted after pg_upgrade was finished. Because we don't want to
keep that schema around permanently, move them to pg_catalog but
rename them with a binary_upgrade_... prefix. The provided
functions are only small wrappers around global variables that were
added specifically for pg_upgrade use, so keeping the module
separate does not create any modularity. The functions still check
that they are only called in binary upgrade mode, so it is not
possible to call these during normal operation. Reviewed-by:
Michael Paquier <michael.paquier <at> gmail.com>
Fujii Masao pushed:
- Silence gettext warning about '\r' escape sequence in translatable
string. gettext was unhappy about the commit b216ad7 because it
revealed the problem that internationalized messages may contain
'\r' escape sequence in pg_rewind. This commit moves '\r' to a
separate printf() call. Michael Paquier, bug reported by Peter
Heikki Linnakangas pushed:
- Refactor and fix TAP tests of pg_rewind * Don't pass arguments to
prove, since that's not supported on perl 5.8 which is the minimum
version supported by the TAP tests. Refactor the test files
themselves to run the tests twice, in both local and remote mode. *
Use eq rather than == for string comparison. This thinko caused the
remote versions of the tests to never run. * Add "use strict" and
"use warnings", and fix warnings that that produced. * Increase the
delay after standby promotion, to make the tests more robust. * In
remote mode, the connection string to the promoted standby was
incorrect, leading to connection errors. Patch by Michael Paquier,
to address Peter Eisentraut's report.
- Fix pg_rewind regression tests in VPATH builds. Should call just
"pg_rewind", instead of "./pg_rewind". The tests are called so that
PATH contains the temporariy installation bin dir. Per report from
- Reorganize our CRC source files again. Now that we use CRC-32C in
WAL and the control file, the "traditional" and "legacy" CRC-32
variants are not used in any frontend programs anymore. Move the
code for those back from src/common to src/backend/utils/hash. Also
move the slicing-by-8 implementation (back) to src/port. This is in
preparation for next patch that will add another implementation that
uses Intel SSE 4.2 instructions to calculate CRC-32C, where
- Don't archive bogus recycled or preallocated files after timeline
switch. After a timeline switch, we would leave behind recycled WAL
segments that are in the future, but on the old timeline. After
promotion, and after they become old enough to be recycled again, we
would notice that they don't have a .ready or .done file, create a
.ready file for them, and archive them. That's bogus, because the
files contain garbage, recycled from an older timeline (or
prealloced as zeros). We shouldn't archive such files. This could
happen when we're following a timeline switch during replay, or when
we switch to new timeline at end-of-recovery. To fix, whenever we
switch to a new timeline, scan the data directory for WAL segments
on the old timeline, but with a higher segment number, and remove
them. Those don't belong to our timeline history, and are most
likely bogus recycled or preallocated files. They could also be
valid files that we streamed from the primary ahead of time, but in
any case, they're not needed to recover to the new timeline.
- Use Intel SSE 4.2 CRC instructions where available. Modern x86 and
x86-64 processors with SSE 4.2 support have special instructions,
crc32b and crc32q, for calculating CRC-32C. They greatly speed up
CRC calculation. Whether the instructions can be used or not
depends on the compiler and the target architecture. If generation
of SSE 4.2 instructions is allowed for the target (-msse4.2 flag on
gcc and clang), use them. If they are not allowed by default, but
the compiler supports the -msse4.2 flag to enable them, compile just
the CRC-32C function with -msse4.2 flag, and check at runtime
whether the processor we're running on supports it. If it doesn't,
fall back to the slicing-by-8 algorithm. (With the common defaults
on current operating systems, the runtime-check variant is what you
get in practice.) Abhijit Menon-Sen, heavily modified by me,
reviewed by Andres Freund.
- Try to fix the CRC-32C autoconf magic for icc compiler. On gcc and
clang, the _mm_crc32_u8 and _mm_crc32_u64 intrinsics are not defined
at all, when not building with -msse4.2. But on icc, they are. So
we cannot assume that if those intrinsics are defined, we can always
use them safely, we might still need the runtime check. To fix,
check if the __SSE_4_2__ preprocessor symbol is defined. That's
supposed to be defined only when the compiler is targeting a
processor that has SSE 4.2 support. Per buildfarm members fulmar
- Oops, fix misspelled #endif. I hope this fixes the Windows builfarm
- Optimize pg_comp_crc32c_sse42 routine slightly, and also use it on
x86. Eliminate the separate 'len' variable from the loops, and also
use the 4 byte instruction. This shaves off a few more cycles. Even
though this routine that uses the special SSE 4.2 instructions is
much faster than a generic routine, it's still a hot spot, so let's
make it as fast as possible. Change the configure test to not test
_mm_crc32_u64. That variant is only available in the 64-bit x86-64
architecture, not in 32-bit x86. Modify pg_comp_crc32c_sse42 so that
it only uses _mm_crc32_u64 on x86-64. With these changes, the SSE
accelerated CRC-32C implementation can also be used on 32-bit x86
systems. This also fixes the 32-bit MSVC build.
- Fix logic to skip checkpoint if no records have been inserted.
After the WAL format changes, the calculation of the size of a
checkpoint record became incorrect. Instead of trying to fix the
math, check that the previous record, i.e. the xl_prev value that
we'd write for the next record, matches the last checkpoint's redo
pointer. That way it's not dependent on the size of the checkpoint
record at all. The old logic was actually slightly wrong all along:
if the previous checkpoint record crossed a page boundary, the page
headers threw off the record size calculation, and the checkpoint
was not skipped. The new checkpoint would not cross a page boundary,
so this only resulted in at most one extra checkpoint after the
system became idle. The new logic fixes that. (It's not worth fixing
in backbranches). However, it makes some sense to try to keep the
latest checkpoint contained fully in a page, or at least in a single
WAL segment, just on general robustness grounds. If something goes
awfully wrong, it's more likely that you can recover the latest WAL
segment, than the last two WAL segments. So I added an extra check
that the checkpoint is not skipped if the previous checkpoint
crossed a WAL segment. Reported by Jeff Janes.
- Shut down test servers after pg_rewind regression tests. Now that
the test servers are initialized twice in each .pl script, the
single END block is not enough to stop them. Add a new
clean_rewind_test function that is called at the end of each test.
- Minor cleanup of pg_rewind. Update comments and function names to
use the terms "source" and "target" consistently. Some places were
calling them remote and local instead, which was confusing. Fix
incorrect comment in extractPageInfo on database creation record -
it was wrong on what happens for databases created in the target
that don't exist in source.
- Add missing newlines to error messages.
- Error out in pg_rewind if lstat() fails. A "file not found" is
expected if the source server is running, so don't complain about
that. But any other error is definitely not expected.
- Fix assertion failure in logical decoding. Logical decoding set
SnapshotData's regd_count field to avoid the snapshot manager from
prematurely freeing snapshots that are generated by the decoding
system. That was always an abuse of the field, as it was never
supposed to be used outside the snapshot manager. Commit 94028691
made snapshot manager's tracking of the snapshots smarter, and that
scheme fell apart. The snapshot manager got confused and hit the
assertion, when a snapshot that was marked with regd_count==1 was
not found in the heap, where the snapshot manager tracks registered
the snapshots. To fix, don't abuse the regd_count field like that.
Logical decoding still abuses the active_count field for similar
purposes, but that's currently harmless. The assertion failure was
first reported by Michael Paquier
Álvaro Herrera pushed:
- Remove duplicated word in README
- Fix typo in comment. SLRU_SEGMENTS_PER_PAGE ->
SLRU_PAGES_PER_SEGMENT I introduced this ancient typo in subtrans.c
and later propagated it to multixact.c. I fixed the latter in
f741300c, but only back to 9.3; backpatch to all supported branches
- MSVC: Include modules of src/test/modules in build. commit_ts,
being only a module used for test purposes, is ignored in the
process for now. Author: Michael Paquier Reviewed by: Andrew
- MSVC: install src/test/modules together with contrib. These modules
have to be installed so that the testing module can access them.
(We don't have that yet, but will soon have it.) Author: Michael
Paquier. Reviewed by: Andrew Dunstan
- Add new target modulescheck in vcregress.pl. This allows an MSVC
build to run regression tests related to modules in
src/test/modules. Author: Michael Paquier Reviewed by: Andrew
Bruce Momjian pushed:
- pg_upgrade: document need for text search files to be copied.
Report by CJ Estel. Backpatch through 9.4
- pg_upgrade: binary_upgrade_create_empty_extension() is strict. Was
broken by commit 30982be4e5019684e1772dd9170aaa53f5a8e894. Patch by
Stephen Frost pushed:
- Fix typo in relcache's equalPolicy(). The USING policies were not
being checked for differences as the same policy was being passed in
to both sides of the equal(). This could result in backends not
realizing that a policy had been changed, if none of the other
attributes had been changed. Fix by passing to equal() the policy1
and policy2 using quals for comparison. No need to back-patch as
this is not yet released. Noticed while testing changes to RLS
proposed by Dean Rasheed.
== Rejected Patches (for now) ==
No one was disappointed this week
== Pending Patches ==
Stephen Frost sent in another revision of a patch to use GRANT for
access to privileged functions.
Etsuro Fujita sent in two more revisions of a patch to fix some
oddities with EvalQualPlan for FDW queries involving system columns.
David Steele sent in three more revisions of a patch to implement
Simon Riggs sent in another revision of a patch to disable HOT
Etsuro Fujita sent in another revision of a patch to fix some
infelicities in the new feature of having foreign tables in
Etsuro Fujita sent in a patch to allow WITH OIDs when issuing CREATE
FOREIGN TABLE, making it consistently able with ALTER FOREIGN TABLE.
Peter Geoghegan sent in another revision of a patch to implement
INSERT ... ON CONFLICT IGNORE (and UPDATE).
Zhang Zq sent in a patch to fix an issue where duplicate checkpoints
were being inserted when the system was idle.
Qingqing Zhou sent in a patch to assert there is no duplicated exit
Qingqing Zhou sent in a patch to use outerPlanState() consistently in
the executor code.
Álvaro Herrera sent in a patch to show xl_prev in xlog.c errcontext.
J.L. Tallon sent in a patch to implement a new GUC
(default_index_tablespace) plus supporting code.
Michael Paquier sent in a doc patch to warn about possible information
leakage from compressing full-page writes.
Etsuro Fujita sent in a patch to fix some markup in config.sgml.
Abhijit Menon-Sen sent in another revision of a patch to recursively
fsync PGDATA at startup if needed.
Michael Paquier sent in a patch to fix broken Install.bat when target
directory contains a space.
Shigeru HANADA sent in two more revisions of a patch to add custom and
foreign JOIN APIs.
Alexander Korotkov sent in another revision of a patch to implement
KNN-GiST with recheck.
Zhang Zq sent in a patch to implement xidin.
Abhijit Menon-Sen sent in a patch to avoid dividing by zero when
Andres Freund sent in another revision of a patch to iIntroduce
Petr Jelinek sent in another revision of a patch to implement
Dmitry Dolgov sent in another revision of a patch to add some useful
functions for manipulating and pretty-printing JSON.
Michael Paquier sent in a patch to add a missing --debug for remote
mode in pg_rewind tests to RewindTest.pm.
Michael Paquier sent in another revision of a patch to add support for
TAP tests on Windows and prefer IPC's run to system_or_bail in
Mikko Tiihonen sent in a patch to libpq which allows specifying
multiple host names to try to connect to.
Tomas Vondra sent in a patch to allow initdb-time support for various
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