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From: David Fetter <david <at> fetter.org>
Subject: == PostgreSQL Weekly News - November 25 2012 ==
Newsgroups: gmane.comp.db.postgresql.announce
Date: Monday 26th November 2012 06:07:33 UTC (over 3 years ago)
== PostgreSQL Weekly News - November 25 2012 ==

== PostgreSQL Jobs for November ==


== PostgreSQL Local ==

The FOSDEM PGDay conference that will be held before FOSDEM in
Brussels, Belgium, on Feb 1st, 2013.  The CfP for both this event and
for the PG track of FOSDEM are open.

PGDay NYC 2013 will be held on March 22, 2013 in New York City.  The
CfP submission deadline is January 7th, 2013 at noon eastern time.
papers AT nycpug DOT org.

== 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 [email protected], German language
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to [email protected]

== Applied Patches ==

Heikki Linnakangas pushed:

- Fix archive_cleanup_command.  When I moved ExecuteRecoveryCommand()
  from xlog.c to xlogarchive.c, I didn't realize that it's called from
  the checkpoint process, not the startup process. I tried to use
  InRedo variable to decide whether or not to attempt cleaning up the
  archive (must not do so before we have read the initial checkpoint
  record), but that variable is only valid within the startup process.
  Instead, let ExecuteRecoveryCommand() always clean up the archive,
  and add an explicit argument to RestoreArchivedFile() to say whether
  that's allowed or not. The caller knows better.  Reported by Erik
  Rijkers, diagnosis by Fujii Masao. Only 9.3devel is affected.

- Speed up operations on numeric, mostly by avoiding palloc()
  overhead.  In many functions, a NumericVar was initialized from an
  input Numeric, to be passed as input to a calculation function. When
  the NumericVar is not modified, the digits array of the NumericVar
  can point directly to the digits array in the original Numeric, and
  we can avoid a palloc() and memcpy(). Add init_var_from_num()
  function to initialize a var like that.  Remove dscale argument from
  get_str_from_var(), as all the callers just passed the dscale of the
  variable. That means that the rounding it used to do was not
  actually necessary, and get_str_from_var() no longer scribbles on
  its input. That makes it safer in general, and allows us to use the
  new init_var_from_num() function in e.g numeric_out().  Also
  modified numericvar_to_int8() to no scribble on its input either. It
  creates a temporary copy to avoid that. To compensate, the callers
  no longer need to create a temporary copy, so the net # of pallocs
  is the same, but this is nicer.  In the passing, use a constant for
  the number 10 in get_str_from_var_sci(), when calculating
  10^exponent. Saves a palloc() and some cycles to convert integer 10
  to numeric.  Original patch by Kyotaro HORIGUCHI, with further
  changes by me.  Reviewed by Pavel Stehule.

- Avoid bogus "out-of-sequence timeline ID" errors in standby-mode.
  When startup process opens a WAL segment after replaying part of it,
  it validates the first page on the WAL segment, even though the page
  it's really interested in later in the file. As part of the
  validation, it checks that the TLI on the page header is >= the TLI
  it saw on the last page it read. If the segment contains a timeline
  switch, and we have already replayed it, and then re-open the WAL
  segment (because of streaming replication got disconnected and
  reconnected, for example), the TLI check will fail when the first
  page is validated. Fix that by relaxing the TLI check when
  re-opening a WAL segment.  Backpatch to 9.0. Earlier versions had
  the same code, but before standby mode was introduced in 9.0,
  recovery never tried to re-read a segment after partially replaying
  it.  Reported by Amit Kapila, while testing a new feature.

Tom Lane pushed:

- Improve handling of INT_MIN / -1 and related cases.  Some platforms
  throw an exception for this division, rather than returning a
  necessarily-overflowed result.  Since we were testing for overflow
  after the fact, an exception isn't nice.  We can avoid the problem
  by treating division by -1 as negation.  Add some regression tests
  so that we'll find out if any compilers try to optimize away the
  overflow check conditions.  This ought to be back-patched, but I'm
  going to see what the buildfarm reports about the regression tests
  first.  Per discussion with Xi Wang, though this is different from
  the patch he submitted.

- Don't launch new child processes after we've been told to shut down.
  Once we've received a shutdown signal (SIGINT or SIGTERM), we should
  not launch any more child processes, even if we get signals
  requesting such.  The normal code path for spawning backends has
  always understood that, but the postmaster's infrastructure for hot
  standby and autovacuum didn't get the memo.  As reported by Hari
  Babu in bug #7643, this could lead to failure to shut down at all in
  some cases, such as when SIGINT is received just before the startup
  process sends PMSIGNAL_RECOVERY_STARTED: we'd launch a bgwriter and
  checkpointer, and then those processes would have no idea that they
  ought to quit.  Similarly, launching a new autovacuum worker would
  result in waiting till it finished before shutting down.  Also,
  switch the order of the code blocks in reaper() that detect startup
  process crash versus shutdown termination.  Once we've sent it a
  signal, we should not consider that exit(1) is surprising.  This is
  just a cosmetic fix since shutdown occurs correctly anyway, but
  better not to log a phony complaint about startup process crash.
  Back-patch to 9.0.  Some parts of this might be applicable before
  that, but given the lack of prior complaints I'm not going to worry
  too much about older branches.

- Fix pg_resetxlog to use correct path to postmaster.pid.  Since we've
  already chdir'd into the data directory, the file should be
  referenced as just "postmaster.pid", without prefixing the directory
  path.  This is harmless in the normal case where an absolute PGDATA
  path is used, but quite dangerous if a relative path is specified,
  since the program might then fail to notice an active postmaster.
  Reported by Hari Babu.  This got broken in my commit
  eb5949d190e80360386113fde0f05854f0c9824d, so patch all active

Bruce Momjian pushed:

- In pg_upgrade, report errno string if file existence check returns
  an error and errno != ENOENT.

- In pg_upgrade, fix a few place that used maloc/free rather than

- In pg_upgrade, simplify function copy_file() by using pg_malloc()
  and centralizing error/shutdown code.

Michael Meskes pushed:

- Applied patch by Chen Huajun  to
  make ecpg able to cope with very long structs.

Peter Eisentraut pushed:

- Remove -Wlogical-op from standard compiler flags.  It creates too
  many warnings with GCC 4.3 and 4.4.

== Rejected Patches (for now) ==

No one was disappointed this week :-)

== Pending Patches ==

Heikki Linnakangas sent in three more revisions of a patch to allow
switching timelines over streaming replication.

Alvaro Herrera sent in two more revisions of the patch to add custom
background worker processes.

Alexander Korotkov sent in four more revisions of a patch to allow
certain types of regex to use trigrams, i.e. indexes.

Marcin Mańk sent in a WIP patch to speed up headline generation in

Robert Haas sent in three more revisions of a patch to implement a
binary heap.

Zoltan Boszormenyi sent in five more revisions of a patch to enable
pg_basebackup to configure and start a standby.

Andrew Dunstan sent in a patch to fix an infelicity in names on the
Windows platform.

Andrew Dunstan sent in two revisions of a patch to enhance JSON

Magnus Hagander and Zoltan Boszormenyi traded patches to add a
PQconninfo() function.

Shigeru HANADA sent in another revision of a patch to add a FDW for

Jeff Davis sent in two more revisions of a patch to remove

Etsuro Fujita sent in another revision of a patch to add PRE- and
POST- options to COPY.

Fujii Masao sent in another revision of a patch to add a
pg_stat_ginindex to pg_stattuple.

Asif Rehman sent in two more revisions of a patch to allow PL/pgsql to
return a row expression in certain cases.

Amit Kapila sent in another revision of a patch to allow
postgresql.conf values to be changed via SQL.

Alvaro Herrera sent in another revision of a patch to split up the
*_desc routines.

Bruce Momjian sent in a patch to fix a performance issue in pg_upgrade
in the many-tables case.

Jeff Janes and Bruce Momjian traded patches to fix a performance issue
in pg_upgrade in the many-tables case...another approach.

Andres Freund sent in a patch to fix an infelicity in the interaction

KaiGai Kohei sent in another revision of a patch to implement
row-level access control.

Jeff Davis sent in another revision of a patch to enable page

Tom Lane sent in a patch to fix an infelicity in max()/min() in
certain cases.  The patch changes the behavior of

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