Robert Haas [Thu, 30 Oct 2014 15:35:55 +0000 (11:35 -0400)]
"Pin", rather than "keep", dynamic shared memory mappings and segments.
Nobody seemed concerned about this naming when it originally went in,
but there's a pending patch that implements the opposite of
dsm_keep_mapping, and the term "unkeep" was judged unpalatable.
"unpin" has existing precedent in the PostgreSQL code base, and the
English language, so use this terminology instead.
Tom Lane [Wed, 29 Oct 2014 22:12:02 +0000 (18:12 -0400)]
Avoid corrupting tables when ANALYZE inside a transaction is rolled back.
VACUUM and ANALYZE update the target table's pg_class row in-place, that is
nontransactionally. This is OK, more or less, for the statistical columns,
which are mostly nontransactional anyhow. It's not so OK for the DDL hint
flags (relhasindex etc), which might get changed in response to
transactional changes that could still be rolled back. This isn't a
problem for VACUUM, since it can't be run inside a transaction block nor
in parallel with DDL on the table. However, we allow ANALYZE inside a
transaction block, so if the transaction had earlier removed the last
index, rule, or trigger from the table, and then we roll back the
transaction after ANALYZE, the table would be left in a corrupted state
with the hint flags not set though they should be.
To fix, suppress the hint-flag updates if we are InTransactionBlock().
This is safe enough because it's always OK to postpone hint maintenance
some more; the worst-case consequence is a few extra searches of pg_index
et al. There was discussion of instead using a transactional update,
but that would change the behavior in ways that are not all desirable:
in most scenarios we're better off keeping ANALYZE's statistical values
even if the ANALYZE itself rolls back. In any case we probably don't want
to change this behavior in back branches.
Per bug #11638 from Casey Shobe. This has been broken for a good long
time, so back-patch to all supported branches.
Tom Lane and Michael Paquier, initial diagnosis by Andres Freund
Robert Haas [Wed, 29 Oct 2014 16:35:19 +0000 (12:35 -0400)]
Avoid setup work for invalidation messages at start-of-(sub)xact.
Instead of initializing a new TransInvalidationInfo for every
transaction or subtransaction, we can just do it for those
transactions or subtransactions that actually need to queue
invalidation messages. That also avoids needing to free those
entries at the end of a transaction or subtransaction that does
not generate any invalidation messages, which is by far the
common case.
Patch by me. Review by Simon Riggs and Andres Freund.
If you call PQreset() repeatedly, and the connection cannot be
re-established, the error messages from the failed connection attempts
kept accumulating in the error string.
Fixes bug #11455 reported by Caleb Epstein. Backpatch to all supported
versions.
Tom Lane [Tue, 28 Oct 2014 22:36:02 +0000 (18:36 -0400)]
Remove obsolete commentary.
Since we got rid of non-MVCC catalog scans, the fourth reason given for
using a non-transactional update in index_update_stats() is obsolete.
The other three are still good, so we're not going to change the code,
but fix the comment.
Noah Misch [Mon, 27 Oct 2014 23:59:39 +0000 (19:59 -0400)]
MinGW: Include .dll extension in .def file LIBRARY commands.
Newer toolchains append the extension implicitly if missing, but
buildfarm member narwhal (gcc 3.4.2, ld 2.15.91 20040904) does not.
This affects most core libraries having an exports.txt file, namely
libpq and the ECPG support libraries. On Windows Server 2003, Windows
API functions that load and unload DLLs internally will mistakenly
unload a libpq whose DLL header reports "LIBPQ" instead of "LIBPQ.dll".
When, subsequently, control would return to libpq, the backend crashes.
Back-patch to 9.4, like commit 846e91e0223cf9f2821c3ad4dfffffbb929cb027.
Before that commit, we used a different linking technique that yielded
"libpq.dll" in the DLL header.
Commit 53566fc0940cf557416b13252df57350a4511ce4 worked around this by
eliminating a call to a function that loads and unloads DLLs internally.
That commit is no longer necessary for correctness, but its improving
consistency with the MSVC build remains valid.
1. The comparison for matching terms used only the CRC to decide if there's
a match. Two different terms with the same CRC gave a match.
2. It assumed that if the second operand has more terms than the first, it's
never a match. That assumption is bogus, because there can be duplicate
terms in either operand.
Rewrite the implementation in a way that doesn't have those bugs.
Tom Lane [Mon, 27 Oct 2014 00:59:21 +0000 (20:59 -0400)]
Avoid unportable strftime() behavior in pg_dump/pg_dumpall.
Commit ad5d46a4494b0b480a3af246bb4227d9bdadca37 thought that we could
get around the known portability issues of strftime's %Z specifier by
using %z instead. However, that idea seems to have been innocent of
any actual research, as it certainly missed the facts that
(1) %z is not portable to pre-C99 systems, and
(2) %z doesn't actually act differently from %Z on Windows anyway.
Per failures on buildfarm member hamerkop.
While at it, centralize the code defining what strftime format we
want to use in pg_dump; three copies of that string seems a bit much.
Tom Lane [Sun, 26 Oct 2014 23:17:55 +0000 (19:17 -0400)]
Fix undersized result buffer in pset_quoted_string().
The malloc request was 1 byte too small for the worst-case output.
This seems relatively unlikely to cause any problems in practice,
as the worst case only occurs if the input string contains no
characters other than single-quote or newline, and even then
malloc alignment padding would probably save the day. But it's
definitely a bug.
Tom Lane [Sun, 26 Oct 2014 20:12:22 +0000 (16:12 -0400)]
Improve planning of btree index scans using ScalarArrayOpExpr quals.
Since we taught btree to handle ScalarArrayOpExpr quals natively (commit 9e8da0f75731aaa7605cf4656c21ea09e84d2eb1), the planner has always included
ScalarArrayOpExpr quals in index conditions if possible. However, if the
qual is for a non-first index column, this could result in an inferior plan
because we can no longer take advantage of index ordering (cf. commit 807a40c551dd30c8dd5a0b3bd82f5bbb1e7fd285). It can be better to omit the
ScalarArrayOpExpr qual from the index condition and let it be done as a
filter, so that the output doesn't need to get sorted. Indeed, this is
true for the query introduced as a test case by the latter commit.
To fix, restructure get_index_paths and build_index_paths so that we
consider paths both with and without ScalarArrayOpExpr quals in non-first
index columns. Redesign the API of build_index_paths so that it reports
what it found, saving useless second or third calls.
Report and patch by Andrew Gierth (though rather heavily modified by me).
Back-patch to 9.2 where this code was introduced, since the issue can
result in significant performance regressions compared to plans produced
by 9.1 and earlier.
Peter Eisentraut [Sun, 26 Oct 2014 13:47:01 +0000 (09:47 -0400)]
Fix TAP tests with Perl 5.8
The prove program included in Perl 5.8 does not support the --ext
option, so don't use that and use wildcards on the command line instead.
Note that the tests will still all be skipped, because, for instance,
the version of Test::More is too old, but at least the regular
mechanisms for handling that will apply, instead of failing to call
prove altogether.
Work around Windows locale name with non-ASCII character.
Windows has one a locale whose name contains a non-ASCII character:
"Norwegian (Bokmål)" (that's an 'a' with a ring on top). That causes
trouble; when passing it setlocale(), it's not clear what encoding the
argument should be in. Another problem is that the locale name is stored in
pg_database catalog table, and the encoding used there depends on what
server encoding happens to be in use when the database is created. For
example, if you issue the CREATE DATABASE when connected to a UTF-8
database, the locale name is stored in pg_database in UTF-8. As long as all
locale names are pure ASCII, that's not a problem.
To work around that, map the troublesome locale name to a pure-ASCII alias
of the same locale, "norwegian-bokmal".
Now, this doesn't change the existing values that are already in
pg_database and in postgresql.conf. Old clusters will need to be fixed
manually. Instructions for that need to be put in the release notes.
This fixes bug #11431 reported by Alon Siman-Tov. Backpatch to 9.2;
backpatching further would require more work than seems worth it.
Alvaro Herrera [Fri, 24 Oct 2014 10:14:09 +0000 (07:14 -0300)]
psql: complain if pg_dump custom-format is detected
Apparently, this is a very common mistake for users to make; it is
better to have it fail reasonably rather than throw potentially a large
number of errors. Since we have a magic string at the start of the
file, we can detect the case easily and there's no other possible useful
behavior anyway.
Tom Lane [Thu, 23 Oct 2014 19:59:40 +0000 (15:59 -0400)]
In type_sanity, check I/O functions of built-in types are not volatile.
We have a project policy that I/O functions must not be volatile, as per
commit aab353a60b95aadc00f81da0c6d99bde696c4b75, but we weren't doing
anything to enforce that. In most usage the marking of the function
doesn't matter as long as its behavior is sane --- but I/O casts can
expose the marking as user-visible behavior, as per today's complaint
from Joe Van Dyk about contrib/ltree.
This test as such will only protect us against future errors in built-in
data types. To catch the same error in contrib or third-party types,
perhaps we should make CREATE TYPE complain? But that's a separate
issue from enforcing the policy for built-in types.
Tom Lane [Thu, 23 Oct 2014 17:11:28 +0000 (13:11 -0400)]
Improve ispell dictionary's defenses against bad affix files.
Don't crash if an ispell dictionary definition contains flags but not
any compound affixes. (This isn't a security issue since only superusers
can install affix files, but still it's a bad thing.)
Also, be more careful about detecting whether an affix-file FLAG command
is old-format (ispell) or new-format (myspell/hunspell). And change the
error message about mixed old-format and new-format commands into something
intelligible.
Per bug #11770 from Emre Hasegeli. Back-patch to all supported branches.
Robert Haas [Thu, 23 Oct 2014 16:33:02 +0000 (12:33 -0400)]
Perform less setup work for AFTER triggers at transaction start.
Testing reveals that the memory allocation we do at transaction start
has small but measurable overhead on simple transactions. To cut
down on that overhead, defer some of that work to the point when
AFTER triggers are first used, thus avoiding it altogether if they
never are.
Fujii Masao [Thu, 23 Oct 2014 13:33:56 +0000 (22:33 +0900)]
Remove the unused argument of PSQLexec().
This commit simply removes the second argument of PSQLexec that was
set to the same value everywhere. Comments and code blocks related
to this parameter are removed.
Noticed by Heikki Linnakangas, reviewed by Michael Paquier
Robert Haas [Thu, 23 Oct 2014 12:18:45 +0000 (08:18 -0400)]
Add a function to get the authenticated user ID.
Previously, this was not exposed outside of miscinit.c. It is needed
for the pending pg_background patch, and will also be needed for
parallelism. Without it, there's no way for a background worker to
re-create the exact authentication environment that was present in the
process that started it, which could lead to security exposures.
Fujii Masao [Thu, 23 Oct 2014 07:21:27 +0000 (16:21 +0900)]
Prevent the already-archived WAL file from being archived again.
Previously the archive recovery always created .ready file for
the last WAL file of the old timeline at the end of recovery even when
it's restored from the archive and has .done file. That is, there was
the case where the WAL file had both .ready and .done files.
This caused the already-archived WAL file to be archived again.
This commit prevents the archive recovery from creating .ready file
for the last WAL file if it has .done file, in order to prevent it from
being archived again.
This bug was added when cascading replication feature was introduced,
i.e., the commit 5286105800c7d5902f98f32e11b209c471c0c69c.
So, back-patch to 9.2, where cascading replication was added.
Peter Eisentraut [Thu, 23 Oct 2014 01:41:43 +0000 (21:41 -0400)]
Minimize calls of pg_class_aclcheck to minimum necessary
In a couple of code paths, pg_class_aclcheck is called in succession
with multiple different modes set. This patch combines those modes to
have a single call of this function and reduce a bit process overhead
for permission checking.
Author: Michael Paquier <michael@otacoo.com> Reviewed-by: Fabrízio de Royes Mello <fabriziomello@gmail.com>
Tom Lane [Wed, 22 Oct 2014 22:41:44 +0000 (18:41 -0400)]
Ensure libpq reports a suitable error message on unexpected socket EOF.
The EOF-detection logic in pqReadData was a bit confused about who should
set up the error message in case the kernel gives us read-ready-but-no-data
rather than ECONNRESET or some other explicit error condition. Since the
whole point of this situation is that the lower-level functions don't know
there's anything wrong, pqReadData itself must set up the message. But
keep the assumption that if an errno was reported, a message was set up at
lower levels.
Per bug #11712 from Marko Tiikkaja. It's been like this for a very long
time, so back-patch to all supported branches.
Noah Misch [Wed, 22 Oct 2014 02:55:47 +0000 (22:55 -0400)]
MinGW: Use -static-libgcc when linking a DLL.
When commit 846e91e0223cf9f2821c3ad4dfffffbb929cb027 switched the linker
driver from dlltool/dllwrap to gcc, it became possible for linking to
choose shared libgcc. Backends having loaded a module dynamically
linked to libgcc can exit abnormally, which the postmaster treats like a
crash. Resume use of static libgcc exclusively, like 9.3 and earlier.
Back-patch to 9.4.
Noah Misch [Wed, 22 Oct 2014 02:55:43 +0000 (22:55 -0400)]
MinGW: Link with shell32.dll instead of shfolder.dll.
This improves consistency with the MSVC build. On buildfarm member
narwhal, since commit 846e91e0223cf9f2821c3ad4dfffffbb929cb027,
shfolder.dll:SHGetFolderPath() crashes when dblink calls it by way of
pqGetHomeDirectory(). Back-patch to 9.4, where that commit first
appeared. How it caused this regression remains a mystery. This is a
partial revert of commit 889f03812916b146ae504c0fad5afdc7bf2e8a2a, which
adopted shfolder.dll for Windows NT 4.0 compatibility. PostgreSQL 8.2
dropped support for that operating system.
Peter Eisentraut [Tue, 21 Oct 2014 18:46:38 +0000 (14:46 -0400)]
doc: Check DocBook XML validity during the build
Building the documentation with XSLT does not check the DTD, like a
DSSSL build would. One can often get away with having invalid XML, but
the stylesheets might then create incorrect output, as they are not
designed to handle that. Therefore, check the validity of the XML
against the DTD, using xmllint, during the build.
Add xmllint detection to configure, and add some documentation.
xmllint comes with libxml2, which is already in use, but it might be in
a separate package, such as libxml2-utils on Debian.
Peter Eisentraut [Tue, 21 Oct 2014 14:43:09 +0000 (10:43 -0400)]
doc: Update Red Hat documentation tools information
The old text was written in ancient times when RPM packages could be
shared more or less freely across a plethora of RPM-based Linux
distributions. This isn't really the case anymore, so just make this
information more concrete for the Red Hat family.
Andres Freund [Mon, 20 Oct 2014 23:01:56 +0000 (01:01 +0200)]
Don't duplicate log_checkpoint messages for both of restart and checkpoints.
The duplication originated in cdd46c765, where restartpoints were
introduced.
In LogCheckpointStart's case the duplication actually lead to the
compiler's format string checking not to be effective because the
format string wasn't constant.
Arguably these messages shouldn't be elog(), but ereport() style
messages. That'd even allow to translate the messages... But as
there's more mistakes of that kind in surrounding code, it seems
better to change that separately.
Andres Freund [Mon, 20 Oct 2014 22:20:08 +0000 (00:20 +0200)]
Renumber CHECKPOINT_* flags.
Commit 7dbb6069382 added a new CHECKPOINT_FLUSH_ALL flag. As that
commit needed to be backpatched I didn't change the numeric values of
the existing flags as that could lead to nastly problems if any
external code issued checkpoints. That's not a concern on master, so
renumber them there.
Also add a comment about CHECKPOINT_FLUSH_ALL above
CreateCheckPoint().
Andres Freund [Mon, 20 Oct 2014 21:43:46 +0000 (23:43 +0200)]
Flush unlogged table's buffers when copying or moving databases.
CREATE DATABASE and ALTER DATABASE .. SET TABLESPACE copy the source
database directory on the filesystem level. To ensure the on disk
state is consistent they block out users of the affected database and
force a checkpoint to flush out all data to disk. Unfortunately, up to
now, that checkpoint didn't flush out dirty buffers from unlogged
relations.
That bug means there could be leftover dirty buffers in either the
template database, or the database in its old location. Leading to
problems when accessing relations in an inconsistent state; and to
possible problems during shutdown in the SET TABLESPACE case because
buffers belonging files that don't exist anymore are flushed.
This was reported in bug #10675 by Maxim Boguk.
Fix by Pavan Deolasee, modified somewhat by me. Reviewed by MauMau and
Fujii Masao.
Backpatch to 9.1 where unlogged tables were introduced.
Andrew Dunstan [Mon, 20 Oct 2014 18:55:35 +0000 (14:55 -0400)]
Correct volatility markings of a few json functions.
json_agg and json_object_agg and their associated transition functions
should have been marked as stable rather than immutable, as they call IO
functions indirectly. Changing this probably isn't going to make much
difference, as you can't use an aggregate function in an index
expression, but we should be correct nevertheless.
json_object, on the other hand, should be marked immutable rather than
stable, as it does not call IO functions.
As discussed on -hackers, this change is being made without bumping the
catalog version, as we don't want to do that at this stage of the cycle,
and the changes are very unlikely to affect anyone.
Tom Lane [Mon, 20 Oct 2014 16:23:42 +0000 (12:23 -0400)]
Fix mishandling of FieldSelect-on-whole-row-Var in nested lateral queries.
If an inline-able SQL function taking a composite argument is used in a
LATERAL subselect, and the composite argument is a lateral reference,
the planner could fail with "variable not found in subplan target list",
as seen in bug #11703 from Karl Bartel. (The outer function call used in
the bug report and in the committed regression test is not really necessary
to provoke the bug --- you can get it if you manually expand the outer
function into "LATERAL (SELECT inner_function(outer_relation))", too.)
The cause of this is that we generate the reltargetlist for the referenced
relation before doing eval_const_expressions() on the lateral sub-select's
expressions (cf find_lateral_references()), so what's scheduled to be
emitted by the referenced relation is a whole-row Var, not the simplified
single-column Var produced by optimizing the function's FieldSelect on the
whole-row Var. Then setrefs.c fails to match up that lateral reference to
what's available from the outer scan.
Preserving the FieldSelect optimization in such cases would require either
major planner restructuring (to recursively do expression simplification
on sub-selects much earlier) or some amazingly ugly kluge to change the
reltargetlist of a possibly-already-planned relation. It seems better
just to skip the optimization when the Var is from an upper query level;
the case is not so common that it's likely anyone will notice a few
wasted cycles.
AFAICT this problem only occurs for uplevel LATERAL references, so
back-patch to 9.3 where LATERAL was added.
Peter Eisentraut [Sun, 19 Oct 2014 01:58:17 +0000 (21:58 -0400)]
psql: Improve \pset without arguments
Revert the output of the individual backslash commands that change print
settings back to the 9.3 way (not showing the command name in
parentheses). Implement \pset without arguments separately, showing all
settings with values in a table form.
Tom Lane [Sat, 18 Oct 2014 02:55:20 +0000 (22:55 -0400)]
Declare mkdtemp() only if we're providing it.
Follow our usual style of providing an "extern" for a standard library
function only when we're also providing the implementation. This avoids
issues when the system headers declare the function slightly differently
than we do, as noted by Caleb Welton.
We might have to go to the extent of probing to see if the system headers
declare the function, but let's not do that until it's demonstrated to be
necessary.
Tom Lane [Sat, 18 Oct 2014 02:32:55 +0000 (22:32 -0400)]
Avoid core dump in _outPathInfo() for Path without a parent RelOptInfo.
Nearly all Paths have parents, but a ResultPath representing an empty FROM
clause does not. Avoid a core dump in such cases. I believe this is only
a hazard for debugging usage, not for production, else we'd have heard
about it before. Nonetheless, back-patch to 9.1 where the troublesome code
was introduced. Noted while poking at bug #11703.
Fujii Masao [Fri, 17 Oct 2014 18:06:34 +0000 (03:06 +0900)]
Fix bug in handling of connections that pg_receivexlog creates.
Previously pg_receivexlog created new connection for WAL streaming
even though another connection which had been established to create
or delete the replication slot was being left. This caused the unused
connection to be left uselessly until pg_receivexlog exited.
This bug was introduced by the commit d9f38c7.
This patch changes pg_receivexlog so that the connection for
the replication slot is reused for WAL streaming.
Andres Freund, slightly modified by me, reviewed by Michael Paquier
Tom Lane [Fri, 17 Oct 2014 16:49:00 +0000 (12:49 -0400)]
Fix core dump in pg_dump --binary-upgrade on zero-column composite type.
This reverts nearly all of commit 28f6cab61ab8958b1a7dfb019724687d92722538
in favor of just using the typrelid we already have in pg_dump's TypeInfo
struct for the composite type. As coded, it'd crash if the composite type
had no attributes, since then the query would return no rows.
Back-patch to all supported versions. It seems to not really be a problem
in 9.0 because that version rejects the syntax "create type t as ()", but
we might as well keep the logic similar in all affected branches.
Tom Lane [Thu, 16 Oct 2014 19:22:10 +0000 (15:22 -0400)]
Support timezone abbreviations that sometimes change.
Up to now, PG has assumed that any given timezone abbreviation (such as
"EDT") represents a constant GMT offset in the usage of any particular
region; we had a way to configure what that offset was, but not for it
to be changeable over time. But, as with most things horological, this
view of the world is too simplistic: there are numerous regions that have
at one time or another switched to a different GMT offset but kept using
the same timezone abbreviation. Almost the entire Russian Federation did
that a few years ago, and later this month they're going to do it again.
And there are similar examples all over the world.
To cope with this, invent the notion of a "dynamic timezone abbreviation",
which is one that is referenced to a particular underlying timezone
(as defined in the IANA timezone database) and means whatever it currently
means in that zone. For zones that use or have used daylight-savings time,
the standard and DST abbreviations continue to have the property that you
can specify standard or DST time and get that time offset whether or not
DST was theoretically in effect at the time. However, the abbreviations
mean what they meant at the time in question (or most recently before that
time) rather than being absolutely fixed.
The standard abbreviation-list files have been changed to use this behavior
for abbreviations that have actually varied in meaning since 1970. The
old simple-numeric definitions are kept for abbreviations that have not
changed, since they are a bit faster to resolve.
While this is clearly a new feature, it seems necessary to back-patch it
into all active branches, because otherwise use of Russian zone
abbreviations is going to become even more problematic than it already was.
This change supersedes the changes in commit 513d06ded et al to modify the
fixed meanings of the Russian abbreviations; since we've not shipped that
yet, this will avoid an undesirably incompatible (not to mention incorrect)
change in behavior for timestamps between 2011 and 2014.
This patch makes some cosmetic changes in ecpglib to keep its usage of
datetime lookup tables as similar as possible to the backend code, but
doesn't do anything about the increasingly obsolete set of timezone
abbreviation definitions that are hard-wired into ecpglib. Whatever we
do about that will likely not be appropriate material for back-patching.
Also, a potential free() of a garbage pointer after an out-of-memory
failure in ecpglib has been fixed.
This patch also fixes pre-existing bugs in DetermineTimeZoneOffset() that
caused it to produce unexpected results near a timezone transition, if
both the "before" and "after" states are marked as standard time. We'd
only ever thought about or tested transitions between standard and DST
time, but that's not what's happening when a zone simply redefines their
base GMT offset.
In passing, update the SGML documentation to refer to the Olson/zoneinfo/
zic timezone database as the "IANA" database, since it's now being
maintained under the auspices of IANA.
Tom Lane [Wed, 15 Oct 2014 22:50:13 +0000 (18:50 -0400)]
Print planning time only in EXPLAIN ANALYZE, not plain EXPLAIN.
We've gotten enough push-back on that change to make it clear that it
wasn't an especially good idea to do it like that. Revert plain EXPLAIN
to its previous behavior, but keep the extra output in EXPLAIN ANALYZE.
Per discussion.
Internally, I set this up as a separate flag ExplainState.summary that
controls printing of planning time and execution time. For now it's
just copied from the ANALYZE option, but we could consider exposing it
to users.
Alvaro Herrera [Tue, 14 Oct 2014 18:00:55 +0000 (15:00 -0300)]
pg_dump: Reduce use of global variables
Most pg_dump.c global variables, which were passed down individually to
dumping routines, are now grouped as members of the new DumpOptions
struct, which is used as a local variable and passed down into routines
that need it. This helps future development efforts; in particular it
is said to enable a mode in which a parallel pg_dump run can output
multiple streams, and have them restored in parallel.
Also take the opportunity to clean up the pg_dump header files somewhat,
to avoid circularity.
Author: Joachim Wieland, revised by Álvaro Herrera
Reviewed by Peter Eisentraut
Fix deadlock with LWLockAcquireWithVar and LWLockWaitForVar.
LWLockRelease should release all backends waiting with LWLockWaitForVar,
even when another backend has already been woken up to acquire the lock,
i.e. when releaseOK is false. LWLockWaitForVar can return as soon as the
protected value changes, even if the other backend will acquire the lock.
Fix that by resetting releaseOK to true in LWLockWaitForVar, whenever
adding itself to the wait queue.
This should fix the bug reported by MauMau, where the system occasionally
hangs when there is a lot of concurrent WAL activity and a checkpoint.
Backpatch to 9.4, where this code was added.
Peter Eisentraut [Tue, 14 Oct 2014 02:17:34 +0000 (22:17 -0400)]
doc: Improve ALTER VIEW / SET documentation
The way the ALTER VIEW / SET options were listed in the synopsis was
very confusing. Move the list to the main description, similar to how
the ALTER TABLE reference page does it.
This allows transactions that take longer than specified limit to be counted
separately. With --rate, transactions that are already late by the time we
get to execute them are skipped altogether. Using --latency-limit with
--rate allows you to "catch up" more quickly, if there's a hickup in the
server causing a lot of transactions to stall momentarily.
Fabien COELHO, reviewed by Rukh Meski and heavily refactored by me.
Kevin Grittner [Mon, 13 Oct 2014 15:16:36 +0000 (10:16 -0500)]
Increase number of hash join buckets for underestimate.
If we expect batching at the very beginning, we size nbuckets for
"full work_mem" (see how many tuples we can get into work_mem,
while not breaking NTUP_PER_BUCKET threshold).
If we expect to be fine without batching, we start with the 'right'
nbuckets and track the optimal nbuckets as we go (without actually
resizing the hash table). Once we hit work_mem (considering the
optimal nbuckets value), we keep the value.
At the end of the first batch, we check whether (nbuckets !=
nbuckets_optimal) and resize the hash table if needed. Also, we
keep this value for all batches (it's OK because it assumes full
work_mem, and it makes the batchno evaluation trivial). So the
resize happens only once.
There could be cases where it would improve performance to allow
the NTUP_PER_BUCKET threshold to be exceeded to keep everything in
one batch rather than spilling to a second batch, but attempts to
generate such a case have so far been unsuccessful; that issue may
be addressed with a follow-on patch after further investigation.
Tomas Vondra with minor format and comment cleanup by me
Reviewed by Robert Haas, Heikki Linnakangas, and Kevin Grittner
Noah Misch [Mon, 13 Oct 2014 03:33:37 +0000 (23:33 -0400)]
Fix quoting in the add_to_path Makefile macro.
The previous quoting caused "make -C src/bin check" to ignore, rather
than add to, any LD_LIBRARY_PATH content from the environment.
Back-patch to 9.4, where the macro was introduced.
Noah Misch [Mon, 13 Oct 2014 03:27:06 +0000 (23:27 -0400)]
Suppress dead, unportable src/port/crypt.c code.
This file used __int64, which is specific to native Windows, rather than
int64. Suppress the long-unused union field of this type. Noticed on
Cygwin x86_64 with -lcrypt not installed. Back-patch to 9.0 (all
supported versions).
Peter Eisentraut [Sun, 12 Oct 2014 05:45:25 +0000 (01:45 -0400)]
pg_recvlogical: Improve --help output
List the actions first, as they are the most important options. Group
the other options more sensibly, consistent with the man page. Correct
a few typographical errors, clarify some things.
Also update the pg_receivexlog --help output to make it a bit more
consistent with that of pg_recvlogical.
Tom Lane [Sat, 11 Oct 2014 18:13:51 +0000 (14:13 -0400)]
Fix bogus optimization in JSONB containment tests.
When determining whether one JSONB object contains another, it's okay to
make a quick exit if the first object has fewer pairs than the second:
because we de-duplicate keys within objects, it is impossible that the
first object has all the keys the second does. However, the code was
applying this rule to JSONB arrays as well, where it does *not* hold
because arrays can contain duplicate entries. The test was really in
the wrong place anyway; we should do it within JsonbDeepContains, where
it can be applied to nested objects not only top-level ones.
Report and test cases by Alexander Korotkov; fix by Peter Geoghegan and
Tom Lane.
Change the way encoding and locale checks are done in pg_upgrade.
Lc_collate and lc_ctype have been per-database settings since server version
8.4, but pg_upgrade was still treating them as cluster-wide options. It
fetched the values for the template0 databases in old and new cluster, and
compared them. That's backwards; the encoding and locale of the template0
database doesn't matter, as template0 is guaranteed to contain only ASCII
characters. But if there are any other databases that exist on both clusters
(in particular template1 and postgres databases), their encodings and
locales must be compatible.
Also, make the locale comparison more lenient. If the locale names are not
equal, try to canonicalize both of them by passing them to setlocale(). We
used to do that only when upgrading from 9.1 or below, but it seems like a
good idea even with newer versions. If we change the canonical form of a
locale, this allows pg_upgrade to still work. I'm about to do just that to
fix bug #11431, by mapping a locale name that contains non-ASCII characters
to a pure-ASCII alias of the same locale.
No backpatching, because earlier versions of pg_upgrade still support
upgrading from 8.3 servers. That would be more complicated, so it doesn't
seem worth it, given that we haven't received any complaints about this
from users.
Robert Haas [Wed, 8 Oct 2014 18:35:43 +0000 (14:35 -0400)]
Extend shm_mq API with new functions shm_mq_sendv, shm_mq_set_handle.
shm_mq_sendv sends a message to the queue assembled from multiple
locations. This is expected to be used by forthcoming patches to
allow frontend/backend protocol messages to be sent via shm_mq, but
might be useful for other purposes as well.
shm_mq_set_handle associates a BackgroundWorkerHandle with an
already-existing shm_mq_handle. This solves a timing problem when
creating a shm_mq to communicate with a newly-launched background
worker: if you attach to the queue first, and the background worker
fails to start, you might block forever trying to do I/O on the queue;
but if you start the background worker first, but then die before
attaching to the queue, the background worrker might block forever
trying to do I/O on the queue. This lets you attach before starting
the worker (so that the worker is protected) and then associate the
BackgroundWorkerHandle later (so that you are also protected).
Alvaro Herrera [Tue, 7 Oct 2014 20:23:34 +0000 (17:23 -0300)]
Implement SKIP LOCKED for row-level locks
This clause changes the behavior of SELECT locking clauses in the
presence of locked rows: instead of causing a process to block waiting
for the locks held by other processes (or raise an error, with NOWAIT),
SKIP LOCKED makes the new reader skip over such rows. While this is not
appropriate behavior for general purposes, there are some cases in which
it is useful, such as queue-like tables.
Catalog version bumped because this patch changes the representation of
stored rules.
Reviewed by Craig Ringer (based on a previous attempt at an
implementation by Simon Riggs, who also provided input on the syntax
used in the current patch), David Rowley, and Álvaro Herrera.
Tom Lane [Tue, 7 Oct 2014 01:23:20 +0000 (21:23 -0400)]
Fix array overrun in ecpg's version of ParseDateTime().
The code wrote a value into the caller's field[] array before checking
to see if there was room, which of course is backwards. Per report from
Michael Paquier.
I fixed the equivalent bug in the backend's version of this code way back
in 630684d3a130bb93, but failed to think about ecpg's copy. Fortunately
this doesn't look like it would be exploitable for anything worse than a
core dump: an external attacker would have no control over the single word
that gets written.
Stephen Frost [Mon, 6 Oct 2014 15:18:13 +0000 (11:18 -0400)]
Clean up Create/DropReplicationSlot query buffer
CreateReplicationSlot() and DropReplicationSlot() were not cleaning up
the query buffer in some cases (mostly error conditions) which meant a
small leak. Not generally an issue as the error case would result in an
immediate exit, but not difficult to fix either and reduces the number
of false positives from code analyzers.
In passing, also add appropriate PQclear() calls to RunIdentifySystem().
projects / postgresql / log