== PostgreSQL Weekly News - December 08 2013 ==

От: David Fetter
Тема: == PostgreSQL Weekly News - December 08 2013 ==
Дата: ,
Msg-id: 20131209051817.GA27441@fetter.org
(см: обсуждение, исходный текст)
Список: pgsql-announce

== PostgreSQL Weekly News - December 08 2013 ==

PostgreSQL 9.3.2, 9.2.6, 9.1.11, 9.0.15, and 8.4.19 bug fix releases
are out.  Upgrade ASAP.

The 7th annual "Prague PostgreSQL Developers Day" (P2D2) conference
organized by CSPUG (Czech and Slovak PostgreSQL Users Group), will be
held on February 6, 2014 at Faculty of Mathematics and Physics,
Charles University (Malostranske namesti 25, Prague).  Czech language
info below.  The CfP will be open throuh 2014/01/03.

The PostgreSQL Users Group in Singapore, PUGS, has assembled.  For
more information, see:

== PostgreSQL Product News ==

DataFiller version 1.1.5, a random data generator for PostgreSQL based
on the database schema + directives, released.

pg8000 1.9.0, a DB-API 2.0 compatible Pure-Python connector for
PostgreSQL, released.  Driver:

pg_activity 1.1.0 released.

Pyrseas 0.7.1, a toolkit for PostgreSQL version control, released.

sqlserver2pgsql, a Perl- and Ketl-based utility for helping convert
from MS-SQL Server, released.

== PostgreSQL Jobs for December ==


== PostgreSQL Local ==

FOSDEM PGDay, a one day conference held before FOSDEM in Brussels,
Belgium, will be on Jan 31st, 2014.  Details:
CfP is closing December 15, 2013.

== 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 , German language
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== Applied Patches ==

Robert Haas pushed:

- Avoid out-of-bounds read in errfinish if error_stack_depth < 0.  If
  errordata_stack_depth < 0, we won't find that out and correct the
  problem until CHECK_STACK_DEPTH() is invoked.  In the meantime,
  elevel will be set based on an invalid read.  This is probably
  harmless in practice, but it seems cleaner this way.  Xi Wang

- Make NUM_TOCHAR_prepare and NUM_TOCHAR_finish macros declare "len".
  Remove the variable from the enclosing scopes so that nothing can be
  relying on it.  The net result of this refactoring is that we get
  rid of a few unnecessary strlen() calls.  Original patch from Greg
  Jaskiewicz, substantially expanded by me.

- Flag mmap implemenation of dynamic shared memory as resize-capable.
  Error noted by Heikki Linnakangas

Tom Lane pushed:

- Increase git_changelog's timestamp_slop from 10 min to 1 day.  Many
  committers seem to now be using a work flow in which back-patched
  commits are timestamped minutes or even hours apart in different
  branches (most likely because they commit in one branch before
  starting work on the next one).  git_changelog was failing to merge
  its reports in such cases, so increase the max time it's willing to
  merge commits across.  I considered getting rid of the limit
  altogether, but that produces some odd results in terms of how the
  merged commit gets sorted relative to unrelated commits.

- Improve draft release notes.  Per suggestions from Andres Freund.
  Also fix spelling of Sergey Burladyan's name.

- Update release notes for 9.3.2, 9.2.6, 9.1.11, 9.0.15, 8.4.19.

- Fix crash in assign_collations_walker for EXISTS with empty SELECT
  list.  We (I think I, actually) forgot about this corner case while
  coding collation resolution.  Per bug #8648 from Arjen Nienhuis.

- Clear retry flags properly in replacement OpenSSL sock_write
  function.  Current OpenSSL code includes a BIO_clear_retry_flags()
  step in the sock_write() function.  Either we failed to copy the
  code correctly, or they added this since we copied it.  In any case,
  lack of the clear step appears to be the cause of the server lockup
  after connection loss reported in bug #8647 from Valentine
  Gogichashvili.  Assume that this is correct coding for all OpenSSL
  versions, and hence back-patch to all supported branches.  Diagnosis
  and patch by Alexander Kukushkin.

Bruce Momjian pushed:

- doc:  update wording of ineffective SET and ABORT commands.  Wording
  by Alvaro Herrera

- Update C comment for pg_fe_getauthname.  This function no longer
  takes an argument.

- C comment:  again update comment for pg_fe_sendauth for error cases

- libpq:  change PQconndefaults() to ignore invalid service files.
  Previously missing or invalid service files returned NULL.  Also fix
  pg_upgrade to report "out of memory" for a null return from
  PQconndefaults().  Patch by Steve Singer, rewritten by me

- doc: split long query into multiple lines.  Report from Erik Rijkers

- build:  pass EXTRA_REGRESS_OPTS to secondary regression tests.
  Christoph Berg

- docs: clarify SSL certificate authority chain docs.  Previously, the
  requirements of how intermediate certificates were handled and their
  chain to root certificates was unclear.

- docs: update partition encryption options.  Text from Adam Vande

Peter Eisentraut pushed:

- doc: Refine documentation about recovery command exist status.  Add
  more documentation about how different exit codes and signals are
  handled in each case.  Reviewed-by: Peter Geoghegan <>

- Report exit code from external recovery commands properly.  When an
  external recovery command such as restore_command or
  archive_cleanup_command fails, report the exit code properly,
  distinguishing signals and normal exists, using the existing
  wait_result_to_str() facility, instead of just reporting the return
  value from system().  Reviewed-by: Peter Geoghegan <>

- Fix whitespace

- SSL: Add configuration option to prefer server cipher order.  By
  default, OpenSSL (and SSL/TLS in general) lets the client cipher
  order take priority.  This is OK for browsers where the ciphers were
  tuned, but few PostgreSQL client libraries make the cipher order
  configurable.  So it makes sense to have the cipher order in
  postgresql.conf take priority over client defaults.  This patch adds
  the setting "ssl_prefer_server_ciphers" that can be turned on so
  that server cipher order is preferred.  Per discussion, this now
  defaults to on.  From: Marko Kreen <> Reviewed-by:
  Adrian Klaver <>

- SSL: Support ECDH key exchange.  This sets up ECDH key exchange,
  when compiling against OpenSSL that supports Emmanuel Cecchet.  Then
  the ECDHE-RSA and ECDHE-ECDSA cipher suites can be used for SSL
  connections.  The latter one means that Emmanuel Cecchet keys are
  now usable.  The reason for Emmanuel Cecchet key exchange is that
  it's faster than DHE and it allows to go to higher security levels
  where RSA will be horribly slow.  There is also new GUC option
  ssl_ecdh_curve that specifies the curve name used for ECDH.  It
  defaults to "prime256v1", which is the most common curve in use in
  HTTPS.  From: Marko Kreen <> Reviewed-by: Adrian
  Klaver <>

Heikki Linnakangas pushed:

- Fix full-page writes of internal GIN pages.  Insertion to a non-leaf
  GIN page didn't make a full-page image of the page, which is wrong.
  The code used to do it correctly, but was changed (commit
  853d1c3103fa961ae6219f0281885b345593d101) because the redo-routine
  didn't track incomplete splits correctly when the page was restored
  from a full page image. Of course, that was not right way to fix it,
  the redo routine should've been fixed instead. The redo-routine was
  surreptitiously fixed in 2010 (commit
  4016bdef8aded77b4903c457050622a5a1815c16), so all we need to do now
  is revert the code that creates the record to its original form.
  This doesn't change the format of the WAL record.  Backpatch to all
  supported versions.

- Don't include unused space in LOG_NEWPAGE records.  This is the same
  trick we use when taking a full page image of a buffer passed to

Alvaro Herrera pushed:

- Avoid resetting Xmax when it's a multi with an aborted. update
  HeapTupleSatisfiesUpdate can very easily "forget" tuple locks while
  checking the contents of a multixact and finding it contains an
  aborted update, by setting the HEAP_XMAX_INVALID bit.  This would
  lead to concurrent transactions not noticing any previous locks held
  by transactions that might still be running, and thus being able to
  acquire subsequent locks they wouldn't be normally able to acquire.
  This bug was introduced in commit 1ce150b7bb; backpatch this fix to
  9.3, like that commit.  This change reverts the change to the
  delete-abort-savept isolation test in 1ce150b7bb, because that
  behavior change was caused by this bug.  Noticed by Andres Freund
  while investigating a different issue reported by Noah Misch.

- Fix improper abort during update chain locking.  In 247c76a98909, I
  added some code to do fine-grained checking of MultiXact status of
  locking/updating transactions when traversing an update chain.
  There was a thinko in that patch which would have the traversing
  abort, that is return HeapTupleUpdated, when the other transaction
  is a committed lock-only.  In this case we should ignore it and
  return success instead.  Of course, in the case where there is a
  committed update, HeapTupleUpdated is the correct return value.  A
  user-visible symptom of this bug is that in REPEATABLE READ and
  SERIALIZABLE transaction isolation modes spurious serializability
  errors can occur: ERROR:  could not serialize access due to
  concurrent update In order for this to happen, there needs to be a
  tuple that's key-share- locked and also updated, and the update must
  abort; a subsequent transaction trying to acquire a new lock on that
  tuple would abort with the above error.  The reason is that the
  initial FOR KEY SHARE is seen as committed by the new locking
  transaction, which triggers this bug.  (If the UPDATE commits, then
  the serialization error is correctly reported.) When running a query
  in READ COMMITTED mode, what happens is that the locking is aborted
  by the HeapTupleUpdated return value, then EvalPlanQual fetches the
  newest version of the tuple, which is then the only version that
  gets locked.  (The second time the tuple is checked there is no
  misbehavior on the committed lock-only, because it's not checked by
  the code that traverses update chains; so no bug.) Only the newest
  version of the tuple is locked, not older ones, but this is
  harmless.  The isolation test added by this commit illustrates the
  desired behavior, including the proper serialization errors that get
  thrown.  Backpatch to 9.3.

Fujii Masao pushed:

- Expose qurey ID in pg_stat_statements view.  The query ID is the
  internal hash identifier of the statement, and was not available in
  pg_stat_statements view so far.  Daniel Farina, Sameer Thakur and
  Peter Geoghegan, reviewed by me.

Magnus Hagander pushed:

- Fix a couple of typos.  Noted by Peter Geoghegan

- Fix pg_stat_statements build on 32-bit systems.  Peter Geoghegan

Joe Conway pushed:

- Fix performance regression in dblink connection speed.  Previous
  commit e5de601267d98c5d60df6de8d436685c7105d149 modified dblink to
  ensure client encoding matched the server. However the added
  PQsetClientEncoding() call added significant overhead. Restore
  original performance in the common case where client encoding
  already matches server encoding by doing nothing in that case.
  Applies to all active branches.  Issue reported and work sponsored
  by Zonar Systems.

== Rejected Patches (for now) ==

No one was disappointed this week :-)

== Pending Patches ==

Brar Piening sent in a patch to enable Microsoft Visual Studio 2013 as
additional build environment.

Sergey Muraviov sent in a patch to help psql display wide tables more

Zoltan Boszormenyi and Antonin Houska traded patches to allow backup

Amit Kapila and Haribabu Kommi traded patches to reduce WAL for update

Heikki Linnakangas sent in a patch to optimize log_newpage by leaving
out unused space from the block.

Marko Kreen sent in a patch to allow using TLSv1.1+ in libpq.

Stas Kelvich sent in another revision of a patch to add KNN support to
the cube extension.

SAKAMOTO Masahiko sent in another revision of a patch to allow forcing
a WAL log when setting a hint bit.

MauMau sent in two revisions of a patch to place DLLs in the bin
folder for ECPG on Windows.

Tom Lane sent in a patch intended to bridge the gap between ruleutils
and empty targetlists.

Etsuro Fujita sent in another revision of a patch to get more out of
indexes via pathkeys and unique indexes.

MauMau sent in two revisions of a patch to fix an issue where "pg_ctl
stop" times out when it should respond quickly.

Fabrízio de Royes Mello sent in two more revisions of a patch to
enable creating time-delayed standbys.

KaiGai Kohei and Shigeru HANADA traded patches implementing (and
fixing typos in) a custom scan API.

MauMau sent in a patch to fix a bug where psql's \conninfo reports
an incorrect destination on Windows.

Andres Freund sent in another flock of patches for logical changesets.

Zoltan Boszormenyi sent in another revision of a patch to implement
ECPG readahead.

Zoltan Boszormenyi sent in two more revisions of a patch to fix the
ECPG infrastructure.

Peter Geoghegan sent in a patch to do some performance optimization of
btree binary search.

Michael Paquier sent in a patch to fix a bug where regression tests
fail if not launched on a database itself called "regression."

Kevin Grittner sent in a patch to fix a pg_archivecleanup issue.

Antonin Houska sent in a patch to reference to a parent query from ANY

MauMau sent in a patch to fix an issue where pg_ctl fails with
config-only directory on Windows.

Dr. Andreas Kunert sent in three revisions of a patch to allow logging
SSL connections.

MauMau sent in two revisions of a patch to fix an issue on Windows
where pg_ctl always used the same event source.

MauMau sent in a patch to allow a client-only installation on Windows.

Andres Freund sent in a patch to add %z ((s)size_t) support to

Pavel Stehule and Dean Rasheed traded more revisions of the patch to
add DROP ... IF EXISTS ... in the current places where that construct
makes sense.

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