From: Tom Lane Date: Fri, 4 Aug 2017 22:37:18 +0000 (-0400) Subject: First-draft release notes for 9.6.4. X-Git-Tag: REL_10_BETA3~25 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=03378c4da598840b0520a53580dd7713c95f21c8;p=postgresql First-draft release notes for 9.6.4. As usual, the release notes for other branches will be made by cutting these down, but put them up for community review first. --- diff --git a/doc/src/sgml/release-9.6.sgml b/doc/src/sgml/release-9.6.sgml index 764f812d60..927f5d2c3d 100644 --- a/doc/src/sgml/release-9.6.sgml +++ b/doc/src/sgml/release-9.6.sgml @@ -1,6 +1,1145 @@ + + Release 9.6.4 + + + Release date: + 2017-08-10 + + + + This release contains a variety of fixes from 9.6.3. + For information about new features in the 9.6 major release, see + . + + + + Migration to Version 9.6.4 + + + A dump/restore is not required for those running 9.6.X. + + + + However, if you are upgrading from a version earlier than 9.6.3, + see . + + + + + Changes + + + + + + + Correct the documentation about the process for upgrading standby + servers with pg_upgrade (Bruce Momjian) + + + + The previous documentation instructed users to start/stop the primary + server after running pg_upgrade but before syncing + the standby servers. This sequence is unsafe. + + + + + + + Fix concurrent locking of tuple update chains (Álvaro Herrera) + + + + If several sessions concurrently lock a tuple update chain with + nonconflicting lock modes using an old snapshot, and they all + succeed, it was possible for some of them to nonetheless fail (and + conclude there is no live tuple version) due to a race condition. + This had consequences such as foreign-key checks failing to see a + tuple that definitely exists but is being updated concurrently. + + + + + + + Fix potential data corruption when freezing a tuple whose XMAX is a + multixact with exactly one still-interesting member (Teodor Sigaev) + + + + + + + Avoid integer overflow and ensuing crash when sorting more than one + billion tuples in-memory (Sergey Koposov) + + + + + + + On Windows, retry process creation if we fail to reserve the address + range for our shared memory in the new process (Tom Lane, Amit + Kapila) + + + + This is expected to fix infrequent child-process-launch failures that + are probably due to interference from antivirus products. + + + + + + + Fix low-probability corruption of shared predicate-lock hash table + in Windows builds (Thomas Munro, Tom Lane) + + + + + + + Avoid logging clean closure of an SSL connection as though + it were a connection reset (Michael Paquier) + + + + + + + Prevent sending SSL session tickets to clients (Tom Lane) + + + + This fix prevents reconnection failures with ticket-aware client-side + SSL code. + + + + + + + Fix code for setting on + Solaris (Tom Lane) + + + + + + + Fix statistics collector to honor inquiry messages issued just after + a postmaster shutdown and immediate restart (Tom Lane) + + + + Confusion between permanent and temporary statistics file timestamps + allowed the collector to think it had already written data satisfying + the request, when it had not. This only affected inquiries issued + within half a second of the previous postmaster shutdown. + + + + + + + Ensure that the statistics collector's receive buffer size is at + least 100KB (Tom Lane) + + + + This reduces the risk of dropped statistics data on older platforms + whose default receive buffer size is less than that. + + + + + + + Fix possible creation of an invalid WAL segment when a standby is + promoted just after it processes an XLOG_SWITCH WAL + record (Andres Freund) + + + + + + + Fix walsender to exit promptly when client requests + shutdown (Tom Lane) + + + + + + + Fix SIGHUP and SIGUSR1 handling in + walsender processes (Petr Jelinek, Andres Freund) + + + + + + + Prevent walsender-triggered panics during shutdown checkpoints + (Andres Freund, Michael Paquier) + + + + + + + Fix unnecessarily slow restarts of walreceiver + processes due to race condition in postmaster (Tom Lane) + + + + + + + Fix leakage of small subtransactions spilled to disk during logical + decoding (Andres Freund) + + + + This resulted in temporary files consuming excessive disk space. + + + + + + + Reduce the work needed to build snapshots during creation of + logical-decoding slots (Andres Freund, Petr Jelinek) + + + + The previous algorithm was infeasibly expensive on a server with a + lot of open transactions. + + + + + + + Fix race condition that could indefinitely delay creation of + logical-decoding slots (Andres Freund, Petr Jelinek) + + + + + + + Reduce overhead in processing syscache invalidation events (Tom Lane) + + + + This is particularly helpful for logical decoding, which triggers + frequent cache invalidation. + + + + + + + Remove incorrect heuristic used in some cases to estimate join + selectivity based on the presence of foreign-key constraints + (David Rowley) + + + + In some cases where a multi-column foreign key constraint existed but + did not exactly match a query's join structure, the planner used an + estimation heuristic that turns out not to work well at all. Revert + such cases to the way they were estimated before 9.6. + + + + + + + Fix cases where an INSERT or UPDATE assigns + to more than one element of a column that is of domain-over-array + type (Tom Lane) + + + + + + + Allow window functions to be used in sub-SELECTs that + are within the arguments of an aggregate function (Tom Lane) + + + + This case is perfectly valid, but it was accidentally rejected by an + overly-aggressive error check. + + + + + + + Ensure that a view's CHECK OPTIONS clause is enforced + properly when the underlying table is a foreign table (Etsuro Fujita) + + + + Previously, the update might get pushed entirely to the foreign + server, but the need to verify the view conditions was missed if so. + + + + + + + Move autogenerated array types out of the way during + ALTER ... RENAME (Vik Fearing) + + + + Previously, we would rename a conflicting autogenerated array type + out of the way during CREATE; this fix extends that + behavior to renaming operations. + + + + + + + Fix dangling pointer in ALTER TABLE when there is a + comment on a constraint belonging to the table (David Rowley) + + + + Re-applying the comment to the reconstructed constraint could fail + with a weird error message, or even crash. + + + + + + + Ensure that ALTER USER ... SET accepts all the syntax + variants that ALTER ROLE ... SET does (Peter Eisentraut) + + + + + + + Allow a foreign table's CHECK constraints to be + initially NOT VALID (Amit Langote) + + + + CREATE TABLE silently drops NOT VALID + specifiers for CHECK constraints, reasoning that the + table must be empty so the constraint can be validated immediately. + But this is wrong for CREATE FOREIGN TABLE, where there's + no reason to suppose that the underlying table is empty, and even if + it is it's no business of ours to decide that the constraint can be + treated as valid going forward. Skip the optimization in + that case. + + + + + + + Properly update dependency info when changing a datatype I/O + function's argument or return type from opaque to the + correct type (Heikki Linnakangas) + + + + CREATE TYPE updates I/O functions declared in this + long-obsolete style, but it forgot to record a dependency on the + type, allowing a subsequent DROP TYPE to leave broken + function definitions behind. + + + + + + + Allow parallelism in the query plan when COPY copies from + a query's result (Andres Freund) + + + + + + + Reduce memory usage when ANALYZE processes + a tsvector column (Heikki Linnakangas) + + + + + + + Fix unnecessary precision loss and sloppy rounding when multiplying + or dividing money values by integers or floats (Tom Lane) + + + + + + + Tighten checks for whitespace in functions that parse identifiers, + such as regprocedurein() (Tom Lane) + + + + Depending on the prevailing locale, these functions could + misinterpret fragments of multibyte characters as whitespace. + + + + + + + Use relevant #define symbols from Perl while + compiling PL/Perl (Ashutosh Sharma, Tom Lane) + + + + This avoids portability problems, typically manifesting as + a handshake mismatch during library load, when working with + recent Perl versions. + + + + + + + In libpq, reset GSS/SASL and SSPI authentication + state properly after a failed connection attempt (Michael Paquier) + + + + Failure to do this meant that when falling back from SSL to non-SSL + connections, a GSS/SASL failure in the SSL attempt would always cause + the non-SSL attempt to fail. SSPI did not fail, but it leaked memory. + + + + + + + In psql, fix failure when COPY FROM STDIN + is ended with a keyboard EOF signal and then another COPY + FROM STDIN is attempted (Thomas Munro) + + + + This misbehavior is observed on BSD-derived platforms (including + macOS), but not on most others. + + + + + + + Fix pg_dump and pg_restore to + emit REFRESH MATERIALIZED VIEW commands last (Tom Lane) + + + + This prevents errors during dump/restore when a materialized view + refers to tables owned by a different user. + + + + + + + Improve pg_dump/pg_restore's + reporting of error conditions originating in zlib + (Vladimir Kunschikov, Álvaro Herrera) + + + + + + + Fix pg_dump with the + + + It also now correctly assigns ownership of event triggers; before, + they were restored as being owned by the superuser running the + restore script. + + + + + + + Fix pg_dump with the + + + + + + Fix pg_dump to not emit invalid SQL for an empty + operator class (Daniel Gustafsson) + + + + + + + Fix pg_dump output to stdout on Windows (Kuntal Ghosh) + + + + A compressed plain-text dump written to stdout would contain corrupt + data due to failure to put the file descriptor into binary mode. + + + + + + + Fix pg_get_ruledef() to print correct output for + the ON SELECT rule of a view whose columns have been + renamed (Tom Lane) + + + + In some corner cases, pg_dump relies + on pg_get_ruledef() to dump views, so that this error + could result in dump/reload failures. + + + + + + + Fix dumping of outer joins with empty constraints, such as the result + of a NATURAL JOIN with no common columns (Tom Lane) + + + + + + + Fix dumping of function expressions in the FROM clause in + cases where the expression does not deparse into something that looks + like a function call (Tom Lane) + + + + + + + Fix pg_basebackup output to stdout on Windows + (Haribabu Kommi) + + + + A backup written to stdout would contain corrupt data due to failure + to put the file descriptor into binary mode. + + + + + + + Fix pg_rewind to correctly handle files exceeding 2GB + (Kuntal Ghosh, Michael Paquier) + + + + Ordinarily such files won't appear in PostgreSQL data + directories, but they could be present in some cases. + + + + + + + Fix pg_upgrade to ensure that the ending WAL record + does not have = minimum + (Bruce Momjian) + + + + This condition could prevent upgraded standby servers from + reconnecting. + + + + + + + Fix pg_xlogdump's computation of WAL record length + (Andres Freund) + + + + + + + In postgres_fdw, re-establish connections to remote + servers after ALTER SERVER or ALTER USER + MAPPING commands (Kyotaro Horiguchi) + + + + This ensures that option changes affecting connection parameters will + be applied promptly. + + + + + + + In postgres_fdw, allow cancellation of transaction + control commands (Robert Haas, Rafia Sabih) + + + + This change allows us to quickly escape a wait for an unresponsive + remote server in many more cases than previously. + + + + + + + Increase MAX_SYSCACHE_CALLBACKS to provide more room for + extensions (Tom Lane) + + + + + + + Always use + + + This supports larger extension libraries on platforms where it makes + a difference. + + + + + + + Fix unescaped-braces issue in our build scripts for Microsoft MSVC, + to avoid a warning or error from recent Perl versions (Andrew + Dunstan) + + + + + + + In MSVC builds, handle the case where the openssl + library is not within a VC subdirectory (Andrew Dunstan) + + + + + + + In MSVC builds, add proper include path for libxml2 + header files (Andrew Dunstan) + + + + This fixes a former need to move things around in standard Windows + installations of libxml2. + + + + + + + In MSVC builds, recognize a Tcl library that is + named tcl86.lib (Noah Misch) + + + + + + + In MSVC builds, honor PROVE_FLAGS settings + on vcregress.pl's command line (Andrew Dunstan) + + + + + + + + Release 9.6.3