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Per experimentation with a recent example, in which unreasonable amounts
of time could elapse before the backend would respond to a query-cancel.
This might be something to back-patch, but the patch doesn't apply cleanly
because this code was rewritten for 9.1. Given the lack of field
complaints I won't bother for now.
Cédric Villemain
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Add a postmaster_is_alive() test to the wait loop, so that we stop waiting
if the postmaster dies without removing its pidfile. Unfortunately this
only helps after the postmaster has created its pidfile, since until then
we don't know which PID to check. But if it never does create the pidfile,
we can give up in a relatively short time, so this is a useful addition
in practice. Per suggestion from Fujii Masao, though this doesn't look
very much like his patch.
In addition, improve pg_ctl's ability to cope with pre-existing pidfiles.
Such a file might or might not represent a live postmaster that is going to
block our postmaster from starting, but the previous code pre-judged the
situation and gave up waiting immediately. Now, we will wait for up to 5
seconds to see if our postmaster overwrites such a file. This issue
interacts with Fujii's patch because we would make the wrong conclusion
if we did the postmaster_is_alive() test with a pre-existing PID.
All of this could be improved if we rewrote start_postmaster() so that it
could report the child postmaster's PID, so that we'd know a-priori the
correct PID to test with postmaster_is_alive(). That looks like a bit too
much change for so late in the 9.1 development cycle, unfortunately.
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Apparently sane-looking penalty code might return small negative values,
for example because of roundoff error. This will confuse places like
gistchoose(). Prevent problems by clamping negative penalty values to
zero. (Just to be really sure, I also made it force NaNs to zero.)
Back-patch to all supported branches.
Alexander Korotkov
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For consistency, have all non-ASCII characters from contributors'
names in the source be in UTF-8. But remove some other more
gratuitous uses of non-ASCII characters.
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It turns out the reason we hadn't found out about the portability issues
with our credential-control-message code is that almost no modern platforms
use that code at all; the ones that used to need it now offer getpeereid(),
which we choose first. The last holdout was NetBSD, and they added
getpeereid() as of 5.0. So far as I can tell, the only live platform on
which that code was being exercised was Debian/kFreeBSD, ie, FreeBSD kernel
with Linux userland --- since glibc doesn't provide getpeereid(), we fell
back to the control message code. However, the FreeBSD kernel provides a
LOCAL_PEERCRED socket parameter that's functionally equivalent to Linux's
SO_PEERCRED. That is both much simpler to use than control messages, and
superior because it doesn't require receiving a message from the other end
at just the right time.
Therefore, add code to use LOCAL_PEERCRED when necessary, and rip out all
the credential-control-message code in the backend. (libpq still has such
code so that it can still talk to pre-9.1 servers ... but eventually we can
get rid of it there too.) Clean up related autoconf probes, too.
This means that libpq's requirepeer parameter now works on exactly the same
platforms where the backend supports peer authentication, so adjust the
documentation accordingly.
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Even though our existing code for handling credentials control messages has
been basically unchanged since 2001, it was fundamentally wrong: it did not
ensure proper alignment of the supplied buffer, and it was calculating
buffer sizes and message sizes incorrectly. This led to failures on
platforms where alignment padding is relevant, for instance FreeBSD on
64-bit platforms, as seen in a recent Debian bug report passed on by
Martin Pitt (http://bugs.debian.org//cgi-bin/bugreport.cgi?bug=612888).
Rewrite to do the message-whacking using the macros specified in RFC 2292,
following a suggestion from Theo de Raadt in that thread. Tested by me
on Debian/kFreeBSD-amd64; since OpenBSD and NetBSD document the identical
CMSG API, it should work there too.
Back-patch to all supported branches.
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When we added the ability for vacuum to skip heap pages by consulting the
visibility map, we made it just not update the reltuples/relpages
statistics if it skipped any pages. But this could leave us with extremely
out-of-date stats for a table that contains any unchanging areas,
especially for TOAST tables which never get processed by ANALYZE. In
particular this could result in autovacuum making poor decisions about when
to process the table, as in recent report from Florian Helmberger. And in
general it's a bad idea to not update the stats at all. Instead, use the
previous values of reltuples/relpages as an estimate of the tuple density
in unvisited pages. This approach results in a "moving average" estimate
of reltuples, which should converge to the correct value over multiple
VACUUM and ANALYZE cycles even when individual measurements aren't very
good.
This new method for updating reltuples is used by both VACUUM and ANALYZE,
with the result that we no longer need the grotty interconnections that
caused ANALYZE to not update the stats depending on what had happened
in the parent VACUUM command.
Also, fix the logic for skipping all-visible pages during VACUUM so that it
looks ahead rather than behind to decide what to do, as per a suggestion
from Greg Stark. This eliminates useless scanning of all-visible pages at
the start of the relation or just after a not-all-visible page. In
particular, the first few pages of the relation will not be invariably
included in the scanned pages, which seems to help in not overweighting
them in the reltuples estimate.
Back-patch to 8.4, where the visibility map was introduced.
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This is consistent with the behavior of other global objects such as
languages and extensions.
Omitting foreign servers also omits the respective user mappings.
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This makes the behavior compatible with that of hostssl, which
also throws an error when there is no SSL support included.
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Since we now include a sample line for replication on local
connections in pg_hba.conf, don't include it where local
connections aren't available (such as on win32).
Also make sure we use authmethodlocal and not authmethod on
the sample line.
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On further analysis, it turns out that it is not needed to duplicate predicate
locks to the new row version at update, the lock on the version that the
transaction saw as visible is enough. However, there was a different bug in
the code that checks for dangerous structures when a new rw-conflict happens.
Fix that bug, and remove all the row-version chaining related code.
Kevin Grittner & Dan Ports, with some comment editorialization by me.
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According to perlguts, &PL_sv_undef is not the right thing to use in
those cases because it doesn't behave the same way as an undef value via
Perl code. Seems the intuitive way to deal with undef values is subtly
enough broken that it's hard to notice when misused.
The broken uses got inadvertently introduced in commit
87bb2ade2ce646083f39d5ab3e3307490211ad04 by Alexey Klyukin, Alex
Hunsaker and myself on 2011-02-17; no backpatch is necessary.
Per testing report from Greg Mullane.
Author: Alex Hunsaker
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parse_xml_decl's header comment says you can pass NULL for any unwanted
output parameter, but it failed to honor this contract for the "standalone"
flag. The only currently-affected caller is xml_recv, so the net effect is
that sending a binary XML value containing a standalone parameter in its
xml declaration would crash the backend. Per bug #6044 from Christopher
Dillard.
In passing, remove useless initializations of parse_xml_decl's output
parameters in xml_parse.
Back-patch to 8.3, where this code was introduced.
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Cédric Villemain
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With "-w -t 0", we should report "still starting up", not "ok". If we
fall out of the loop without ever being able to call PQping (because we
were never able to construct a connection string), report "no response",
not "ok". This gets rid of corner cases in which we'd claim the server
had started even though it had not.
Also, if the postmaster.pid file is not there at any point after we've
waited 5 seconds, assume the postmaster has failed and report that, rather
than almost-certainly-fruitlessly continuing to wait. The pidfile should
appear almost instantly even when there is extensive startup work to do,
so 5 seconds is already a very conservative figure. This part is per a
gripe from MauMau --- there might be better ways to do it, but nothing
simple enough to get done for 9.1.
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This is necessary to avoid long-term memory leakage, because the main loop
in PostgresMain expects to be executing in MessageContext, and hence is a
bit sloppy about freeing stuff that is only needed for the duration of
processing the current client message. The known case of an actual leak
is when encoding conversion has to be done on the incoming command string,
but there might be others. Per report from Per-Olov Esgard.
Back-patch to 9.0, where the bug was introduced by the LISTEN/NOTIFY
rewrite.
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loop if it fails, which is what what happened on my HP-UX box. (I think
the reason it failed on that box is a misconfiguration on my behalf, but
that's no reason to hang.)
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We had some hacks in ruleutils.c to cope with various odd transformations
that the optimizer could do on a CASE foo WHEN "CaseTestExpr = RHS" clause.
However, the fundamental impossibility of covering all cases was exposed
by Heikki, who pointed out that the "=" operator could get replaced by an
inlined SQL function, which could contain nearly anything at all. So give
up on the hacks and just print the expression as-is if we fail to recognize
it as "CaseTestExpr = RHS". (We must cover that case so that decompiled
rules print correctly; but we are not under any obligation to make EXPLAIN
output be 100% valid SQL in all cases, and already could not do so in some
other cases.) This approach requires that we have some printable
representation of the CaseTestExpr node type; I used "CASE_TEST_EXPR".
Back-patch to all supported branches, since the problem case fails in all.
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We initially had pg_dump emit CREATE EXTENSION commands unconditionally.
However, pg_dump has long been in the habit of not dumping procedural
language definitions when a --schema or --table switch is given. It seems
appropriate to handle extensions the same way, since like PLs they are SQL
objects that are not in any particular schema. Per complaint from Adrian
Schreyer.
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For the --help output and reference pages of pg_dump, pg_dumpall,
pg_restore, put the options in some consistent, mostly alphabetical,
and consistent order, rather than newest option last or something like
that.
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The old .bat file wasn't working for reasons that are unclear, and
which it did not seem worth the trouble to ascertain.
The new perl script has been tested and is known to work.
Soon it will be tested regularly on the buildfarm.
The .bat file is kept as a simple wrapper for the perl script.
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Josh Kupershmidt
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Clear isReset before, not after, calling the context-specific alloc method,
so as to preserve the option to do a tail call in MemoryContextAlloc
(and also so this code isn't assuming that a failed alloc call won't have
changed the context's state before failing). Fix missed direct invocation
of reset method. Reformat a comment.
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Also adjust alignment a bit to distinguish commented out from comment.
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Found with additional valgrind testing.
Noah Misch
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The core CREATE FUNCTION code only enforces that IN parameter names are
non-duplicate, and that OUT parameter names are separately non-duplicate.
This is because some function languages might not have any confusion
between the two. But in plpgsql, such names are all in the same namespace,
so we'd better disallow it.
Per a recent complaint from Dan S. Not back-patching since this is a small
issue and the change could cause unexpected failures if we started to
enforce it in a minor release.
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In the passing, clarify the comment on why text_format_nv wrapper is needed.
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The new logic is less vulnerable to transpositions.
This invalidates the contents of hash indexes built with the old
functions; hence, bump catversion.
Dean Rasheed
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The planner can sometimes compute very large values for numGroups, and in
cases where we have no alternative to building a hashtable, such a value
will get fed directly to BuildTupleHashTable as its nbuckets parameter.
There were two ways in which that could go bad. First, BuildTupleHashTable
declared the parameter as "int" but most callers were passing "long"s,
so on 64-bit machines undetected overflow could occur leading to a bogus
negative value. The obvious fix for that is to change the parameter to
"long", which is what I've done in HEAD. In the back branches that seems a
bit risky, though, since third-party code might be calling this function.
So for them, just put in a kluge to treat negative inputs as INT_MAX.
Second, hash_create can go nuts with extremely large requested table sizes
(notably, my_log2 becomes an infinite loop for inputs larger than
LONG_MAX/2). What seems most appropriate to avoid that is to bound the
initial table size request to work_mem.
This fixes bug #6035 reported by Daniel Schreiber. Although the reported
case only occurs back to 8.4 since it involves WITH RECURSIVE, I think
it's a good idea to install the defenses in all supported branches.
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Historically we didn't do this, even though we had the information, because
plpgsql passed its Params via SPI APIs that only include type OIDs not
typmods. Now that plpgsql uses parser callbacks to create Params, it's
easy to insert the right typmod. This should generally result in lower
surprise factors, because a plpgsql variable that is declared with a typmod
will now work more like a table column with the same typmod. In particular
it's the "right" way to fix bug #6020, in which plpgsql's attempt to return
an anonymous record type is defeated by stricter record-type matching
checks that were added in 9.0. However, it's not impossible that this
could result in subtle behavioral changes that could break somebody's
existing plpgsql code, so I'm afraid to back-patch this change into
released branches. In those branches we'll have to lobotomize the
record-type checks instead.
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avoids the overhead of one function call when calling MemoryContextReset(),
and it seems like the isReset optimization would be applicable to any new
memory context we might invent in the future anyway.
This buys back the overhead I just added in previous patch to always call
MemoryContextReset() in ExecScan, even when there's no quals or projections.
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there's no quals or projections. Currently this only matters for foreign
scans, as none of the other scan nodes litter the per-tuple memory context
when there's no quals or projections.
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Noah Misch
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Other similar options also use the plural form.
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Even though this only affects the insertion of a parenthesized word,
it's unwise to assume that parentheses can pass through untranslated.
And in any case, the new version is clearer in the code and for
translators.
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Also, we removed the display of the current value of
max_connections/MaxBackends from some messages earlier, because it was
confusing, so do that in the remaining one as well.
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Selena Deckelmann
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Dan Ports
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