+
+
Release 9.4.2
+
+
+
Release Date
+ 2015-05-21
+
+
+ This release contains a variety of fixes from 9.4.1.
+ For information about new features in the 9.4 major release, see
+ .
+
+
+
+
Migration to Version 9.4.2
+
+ A dump/restore is not required for those running 9.4.X.
+
+
+ However, if you use contrib/citext's
+ regexp_matches() functions, see the changelog entry below
+ about that.
+
+
+ Also, if you are upgrading from a version earlier than 9.4.1,
+ see .
+
+
+
+
+
Changes
+
+
+
+
+
+
+ Protect against wraparound of multixact member IDs
+ (Álvaro Herrera, Robert Haas, Thomas Munro)
+
+
+ Under certain usage patterns, the existing defenses against this might
+ be insufficient, allowing pg_multixact/members files to be
+ removed too early, resulting in data loss.
+ The fix for this includes modifying the server to fail transactions
+ that would result in overwriting old multixact member ID data, and
+ improving autovacuum to ensure it will act proactively to prevent
+ multixact member ID wraparound, as it does for transaction ID
+ wraparound.
+
+
+
+
+
+
+ Fix incorrect declaration of contrib/citext's
+ regexp_matches() functions (Tom Lane)
+
+
+ These functions should return setof text[], like the core
+ functions they are wrappers for; but they were incorrectly declared as
+ returning just text[]. This mistake had two results: first,
+ if there was no match you got a scalar null result, whereas what you
+ should get is an empty set (zero rows). Second, the g flag
+ was effectively ignored, since you would get only one result array even
+ if there were multiple matches.
+
+
+ While the latter behavior is clearly a bug, there might be applications
+ depending on the former behavior; therefore the function declarations
+ will not be changed by default until
PostgreSQL 9.5.+ In pre-9.5 branches, the old behavior exists in version 1.0 of
+ the citext extension, while we have provided corrected
+ declarations in version 1.1 (which is not installed by
+ default). To adopt the fix in pre-9.5 branches, execute
+ ALTER EXTENSION citext UPDATE TO '1.1' in each database in
+ which citext is installed. (You can also update
+ back to 1.0 if you need to undo that.) Beware that either update
+ direction will require dropping and recreating any views or rules that
+ use citext's regexp_matches() functions.
+
+
+
+
+
+
+ Render infinite dates and timestamps as infinity when
+ converting to json, rather than throwing an error
+ (Andrew Dunstan)
+
+
+
+
+
+
+ Fix json/jsonb's populate_record()
+ and to_record() functions to handle empty input properly
+ (Andrew Dunstan)
+
+
+
+
+
+
+ Fix incorrect checking of deferred exclusion constraints after a HOT
+ update (Tom Lane)
+
+
+ If a new row that potentially violates a deferred exclusion constraint
+ is HOT-updated (that is, no indexed columns change and the row can be
+ stored back onto the same table page) later in the same transaction,
+ the exclusion constraint would be reported as violated when the check
+ finally occurred, even if the row(s) the new row originally conflicted
+ with had been deleted.
+
+
+
+
+
+
+ Fix behavior when changing foreign key constraint deferrability status
+ with ALTER TABLE ... ALTER CONSTRAINT (Tom Lane)
+
+
+ Operations later in the same session or concurrent sessions might not
+ honor the status change promptly.
+
+
+
+
+
+
+ Fix planning of star-schema-style queries (Tom Lane)
+
+
+ Sometimes, efficient scanning of a large table requires that index
+ parameters be provided from more than one other table (commonly,
+ dimension tables whose keys are needed to index a large fact table).
+ The planner should be able to find such plans, but an overly
+ restrictive search heuristic prevented it.
+
+
+
+
+
+
+ Prevent improper reordering of antijoins (NOT EXISTS joins) versus
+ other outer joins (Tom Lane)
+
+
+ This oversight in the planner has been observed to cause could
+ not find RelOptInfo for given relids errors, but it seems possible
+ that sometimes an incorrect query plan might get past that consistency
+ check and result in silently-wrong query output.
+
+
+
+
+
+
+ Fix incorrect matching of subexpressions in outer-join plan nodes
+ (Tom Lane)
+
+
+ Previously, if textually identical non-strict subexpressions were used
+ both above and below an outer join, the planner might try to re-use
+ the value computed below the join, which would be incorrect because the
+ executor would force the value to NULL in case of an unmatched outer row.
+
+
+
+
+
+
+ Fix GEQO planner to cope with failure of its join order heuristic
+ (Tom Lane)
+
+
+ This oversight has been seen to lead to failed to join all
+ relations together errors in queries involving LATERAL,
+ and that might happen in other cases as well.
+
+
+
+
+
+
+ Ensure that row locking occurs properly when the target of
+ an UPDATE or DELETE is a security-barrier view
+ (Stephen Frost)
+
+
+
+
+
+
+ Use a file opened for read/write when syncing replication slot data
+ during database startup (Andres Freund)
+
+
+ On some platforms, the previous coding could result in errors like
+ could not fsync file "pg_replslot/...": Bad file descriptor.
+
+
+
+
+
+
+ Fix possible deadlock at startup
+ when max_prepared_transactions is too small
+ (Heikki Linnakangas)
+
+
+
+
+
+
+ Don't archive useless preallocated WAL files after a timeline switch
+ (Heikki Linnakangas)
+
+
+
+
+
+
+ Recursively fsync() the data directory after a crash
+ (Abhijit Menon-Sen, Robert Haas)
+
+
+ This ensures consistency if another crash occurs shortly later. (The
+ second crash would have to be a system-level crash, not just a database
+ crash, for there to be a problem.)
+
+
+
+
+
+
+ Fix autovacuum launcher's possible failure to shut down, if an error
+ occurs after it receives SIGTERM (Álvaro Herrera)
+
+
+
+
+
+
+ Fix failure to handle invalidation messages for system catalogs
+ early in session startup (Tom Lane)
+
+
+ This oversight could result in failures in sessions that start
+ concurrently with a VACUUM FULL on a system catalog.
+
+
+
+
+
+
+ Fix crash in BackendIdGetTransactionIds() when trying
+ to get status for a backend process that just exited (Tom Lane)
+
+
+
+
+
+
+ Cope with unexpected signals in LockBufferForCleanup()
+ (Andres Freund)
+
+
+ This oversight could result in spurious errors about multiple
+ backends attempting to wait for pincount 1.
+
+
+
+
+
+
+ Fix crash when doing COPY IN to a table with check
+ constraints that contain whole-row references (Tom Lane)
+
+
+ The known failure case only crashes in 9.4 and up, but there is very
+ similar code in 9.3 and 9.2, so back-patch those branches as well.
+
+
+
+
+
+
+ Avoid waiting for WAL flush or synchronous replication during commit of
+ a transaction that was read-only so far as the user is concerned
+ (Andres Freund)
+
+
+ Previously, a delay could occur at commit in transactions that had
+ written WAL due to HOT page pruning, leading to undesirable effects
+ such as sessions getting stuck at startup if all synchronous replicas
+ are down. Sessions have also been observed to get stuck in catchup
+ interrupt processing when using synchronous replication; this will fix
+ that problem as well.
+
+
+
+
+
+
+ Avoid busy-waiting with short recovery_min_apply_delay
+ values (Andres Freund)
+
+
+
+
+
+
+ Fix crash when manipulating hash indexes on temporary tables
+ (Heikki Linnakangas)
+
+
+ This fault was introduced in the previous set of minor releases
+ as a byproduct of a race-condition fix.
+
+
+
+
+
+
+ Fix possible failure during hash index bucket split, if other processes
+ are modifying the index concurrently (Tom Lane)
+
+
+
+
+
+
+ Fix memory leaks in GIN index vacuum (Heikki Linnakangas)
+
+
+
+
+
+
+ Check for interrupts while analyzing index expressions (Jeff Janes)
+
+
+ ANALYZE executes index expressions many times; if there are
+ slow functions in such an expression, it's desirable to be able to
+ cancel the ANALYZE before that loop finishes.
+
+
+
+
+
+
+ Ensure tableoid of a foreign table is reported
+ correctly when a READ COMMITTED recheck occurs after
+ locking rows in SELECT FOR UPDATE, UPDATE,
+ or DELETE (Etsuro Fujita)
+
+
+
+
+
+
+ Improve object description strings for foreign-server user mappings
+ (Álvaro Herrera)
+
+
+ Add the name of the target server, since otherwise it's ambiguous.
+
+
+
+
+
+
+ Include the schema name in object identity strings for conversions
+ (Álvaro Herrera)
+
+
+
+
+
+
+ Recommend setting include_realm to 1 when using
+ Kerberos/GSSAPI/SSPI authentication (Stephen Frost)
+
+
+ Without this, identically-named users from different realms cannot be
+ distinguished. For the moment this is only a documentation change, but
+ it will become the default setting in
PostgreSQL 9.5.+
+
+
+
+
+
+ Remove code for matching IPv4 pg_hba.conf entries to
+ IPv4-in-IPv6 addresses (Tom Lane)
+
+
+ This hack was added in 2003 in response to a report that some Linux
+ kernels of the time would report IPv4 connections as having
+ IPv4-in-IPv6 addresses. However, the logic was accidentally broken in
+ 9.0. The lack of any field complaints since then shows that it's not
+ needed anymore. Now we have reports that the broken code causes
+ crashes on some systems, so let's just remove it rather than fix it.
+ (Had we chosen to fix it, that would make for a subtle and potentially
+ security-sensitive change in the effective meaning of
+ IPv4 pg_hba.conf entries, which does not seem like a good
+ thing to do in minor releases.)
+
+
+
+
+
+
+ Fix status reporting for terminated background workers that were never
+ actually started (Robert Haas)
+
+
+
+
+
+
+ After a database crash, don't restart background workers that are
+ marked BGW_NEVER_RESTART (Amit Khandekar)
+
+
+
+
+
+
+ Report WAL flush, not insert, position in IDENTIFY_SYSTEM
+ replication command (Heikki Linnakangas)
+
+
+ This avoids a possible startup failure
+
+
+
+
+
+
+ While shutting down service on Windows, periodically send status
+ updates to the Service Control Manager to prevent it from killing the
+ service too soon; and ensure that
pg_ctl will wait for+ shutdown (Krystian Bigaj)
+
+
+
+
+
+
+ Guard against network deadlock when using
libpq's+ non-blocking mode (Heikki Linnakangas)
+
+
+ When sending large volumes of data, it's important to drain the input
+ buffer every so often, in case the server has sent enough response data
+ to cause it to block on output. (A typical scenario is that the server
+ is sending a stream of NOTICE messages during COPY FROM
+ STDIN.) This worked properly in the normal blocking mode, but not
+ so much in non-blocking mode. We've modified
libpq+ to opportunistically drain input when it can, but a full defense
+ against this problem requires application cooperation: the application
+ should watch for socket read-ready as well as write-ready conditions,
+ and be sure to call PQconsumeInput() upon read-ready.
+
+
+
+
+
+
+ In
libpq, fix misparsing of empty values in URI+ connection strings (Thomas Fanghaenel)
+
+
+
+
+
+
+ Fix array handling in
ecpg (Michael Meskes)+
+
+
+
+
+
+ Fix
psql to sanely handle URIs and conninfo strings as+ the first parameter to \connect
+ (David Fetter, Andrew Dunstan, Álvaro Herrera)
+
+
+ This syntax has been accepted (but undocumented) for a long time, but
+ previously some parameters might be taken from the old connection
+ instead of the given string, which was agreed to be undesirable.
+
+
+
+
+
+
+ Suppress incorrect complaints from
psql on some+ platforms that it failed to write ~/.psql_history at exit
+ (Tom Lane)
+
+
+ This misbehavior was caused by a workaround for a bug in very old
+ (pre-2006) versions of
libedit. We fixed it by+ removing the workaround, which will cause a similar failure to appear
+ for anyone still using such versions of
libedit.+ Recommendation: upgrade that library, or use
libreadline.+
+
+
+
+
+
+ Fix
pg_dump's rule for deciding which casts are+ system-provided casts that should not be dumped (Tom Lane)
+
+
+
+
+
+
+ In
pg_dump, fix failure to honor -Z+ compression level option together with -Fd
+ (Michael Paquier)
+
+
+
+
+
+
+ Make
pg_dump consider foreign key relationships+ between extension configuration tables while choosing dump order
+ (Gilles Darold, Michael Paquier, Stephen Frost)
+
+
+ This oversight could result in producing dumps that fail to reload
+ because foreign key constraints are transiently violated.
+
+
+
+
+
+
+ Avoid possible
pg_dump failure when concurrent sessions+ are creating and dropping temporary functions (Tom Lane)
+
+
+
+
+
+
+ Fix dumping of views that are just VALUES(...) but have
+ column aliases (Tom Lane)
+
+
+
+
+
+
+ Ensure that a view's replication identity is correctly set
+ to nothing during dump/restore (Marko Tiikkaja)
+
+
+ Previously, if the view was involved in a circular dependency,
+ it might wind up with an incorrect replication identity property.
+
+
+
+
+
+
+ In
pg_upgrade, force timeline 1 in the new cluster+ (Bruce Momjian)
+
+
+ This avoids a scenario in which a server previously promoted from
+ standby status couldn't be upgraded because of a missing WAL history
+ file.
+
+
+
+
+
+
+ In
pg_upgrade, check for improperly non-connectable+ databases before proceeding
+ (Bruce Momjian)
+
+
+
+
+
+
+ In
pg_upgrade, quote directory paths+ properly in the generated delete_old_cluster script
+ (Bruce Momjian)
+
+
+
+
+
+
+ In
pg_upgrade, preserve database-level freezing info+ properly
+ (Bruce Momjian)
+
+
+ This oversight could cause missing-clog-file errors for tables within
+ the postgres and template1 databases.
+
+
+
+
+
+
+ Run
pg_upgrade and pg_resetxlog with+ restricted privileges on Windows, so that they don't fail when run by
+ an administrator (Muhammad Asif Naeem)
+
+
+
+
+
+
+ Improve handling of readdir() failures when scanning
+ directories in
initdb and pg_basebackup+ (Marco Nenciarini)
+
+
+
+
+
+
+ Fix failure in
pg_receivexlog (Andres Freund)+
+
+ A patch merge mistake in 9.2.10 led to could not create archive
+ status file errors.
+
+
+
+
+
+
+ Fix slow sorting algorithm in contrib/intarray (Tom Lane)
+
+
+
+
+
+
+ Fix compile failure on Sparc V8 machines (Rob Rowan)
+
+
+
+
+
+
+ Silence some build warnings on OS X (Tom Lane)
+
+
+
+
+
+
+ Update time zone data files to
tzdata release 2015d+ for DST law changes in Egypt, Mongolia, and Palestine, plus historical
+ changes in Canada and Chile. Also adopt revised zone abbreviations for
+ the America/Adak zone (HST/HDT not HAST/HADT).
+
+
+
+
+
+
+
+
Release 9.4.1
projects / postgresql.git / commitdiff