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* Add COMMENT and SECURITY LABEL support for publications and subscriptionsPeter Eisentraut2017-03-24
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* Add more subscription DDL testsPeter Eisentraut2017-03-24
| | | | | Add more tests for various variants of subscription DDL commands, based on code coverage report. Fix a small bug discovered by that.
* Fix typo in commentAlvaro Herrera2017-03-24
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* Check that published table exists on subscriberPeter Eisentraut2017-03-24
| | | | Author: Petr Jelinek <pjmodos@pjmodos.net>
* Improve access to parallel query from procedural languages.Robert Haas2017-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | In SQL, the ability to use parallel query was previous contingent on fcache->readonly_func, which is only set for non-volatile functions; but the volatility of a function has no bearing on whether queries inside it can use parallelism. Remove that condition. SPI_execute and SPI_execute_with_args always run the plan just once, though not necessarily to completion. Given the changes in commit 691b8d59281b5177f16fe80858df921f77a8e955, it's sensible to pass CURSOR_OPT_PARALLEL_OK here, so do that. This improves access to parallelism for any caller that uses these functions to execute queries. Such callers include plperl, plpython, pltcl, and plpgsql, though it's not the case that they all use these functions exclusively. In plpgsql, allow parallel query for plain SELECT queries (as opposed to PERFORM, which already worked) and for plain expressions (which probably won't go through the executor at all, because they will likely be simple expressions, but if they do then this helps). Rafia Sabih and Robert Haas, reviewed by Dilip Kumar and Amit Kapila Discussion: http://postgr.es/m/CAOGQiiMfJ+4SQwgG=6CVHWoisiU0+7jtXSuiyXBM3y=A=eJzmg@mail.gmail.com
* Fix use-after-free bugAlvaro Herrera2017-03-24
| | | | Detected by buildfarm member prion
* Reverting 42b4b0b2413b9b472aaf2112a3bbfd80a6ab4dc5Simon Riggs2017-03-24
| | | | Buildfarm issues and other reported issues
* Make VACUUM VERBOSE report the number of skipped frozen pages.Fujii Masao2017-03-25
| | | | | | | | | | | | | | | | Previously manual VACUUM did not report the number of skipped frozen pages even when VERBOSE option is specified. But this information is helpful to monitor the VACUUM activity, and also autovacuum reports that number in the log file when the condition of log_autovacuum_min_duration is met. This commit changes VACUUM VERBOSE so that it reports the number of frozen pages that it skips. Author: Masahiko Sawada Reviewed-by: Yugo Nagata and Jim Nasby Discussion: http://postgr.es/m/CAD21AoDZQKCxo0L39Mrq08cONNkXQKXuh=2DP1Q8ebmt35SoaA@mail.gmail.com
* Implement multivariate n-distinct coefficientsAlvaro Herrera2017-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for explicitly declared statistic objects (CREATE STATISTICS), allowing collection of statistics on more complex combinations that individual table columns. Companion commands DROP STATISTICS and ALTER STATISTICS ... OWNER TO / SET SCHEMA / RENAME are added too. All this DDL has been designed so that more statistic types can be added later on, such as multivariate most-common-values and multivariate histograms between columns of a single table, leaving room for permitting columns on multiple tables, too, as well as expressions. This commit only adds support for collection of n-distinct coefficient on user-specified sets of columns in a single table. This is useful to estimate number of distinct groups in GROUP BY and DISTINCT clauses; estimation errors there can cause over-allocation of memory in hashed aggregates, for instance, so it's a worthwhile problem to solve. A new special pseudo-type pg_ndistinct is used. (num-distinct estimation was deemed sufficiently useful by itself that this is worthwhile even if no further statistic types are added immediately; so much so that another version of essentially the same functionality was submitted by Kyotaro Horiguchi: https://postgr.es/m/20150828.173334.114731693.horiguchi.kyotaro@lab.ntt.co.jp though this commit does not use that code.) Author: Tomas Vondra. Some code rework by Álvaro. Reviewed-by: Dean Rasheed, David Rowley, Kyotaro Horiguchi, Jeff Janes, Ideriha Takeshi Discussion: https://postgr.es/m/543AFA15.4080608@fuzzy.cz https://postgr.es/m/20170320190220.ixlaueanxegqd5gr@alvherre.pgsql
* Add a txid_status function.Robert Haas2017-03-24
| | | | | | | | | | | | If your connection to the database server is lost while a COMMIT is in progress, it may be difficult to figure out whether the COMMIT was successful or not. This function will tell you, provided that you don't wait too long to ask. It may be useful in other situations, too. Craig Ringer, reviewed by Simon Riggs and by me Discussion: http://postgr.es/m/CAMsr+YHQiWNEi0daCTboS40T+V5s_+dst3PYv_8v2wNVH+Xx4g@mail.gmail.com
* Avoid SnapshotResetXmin() during AtEOXact_Snapshot()Simon Riggs2017-03-24
| | | | | | | | | | For normal commits and aborts we already reset PgXact->xmin Avoiding touching highly contented shmem improves concurrent performance. Simon Riggs Discussion: CANP8+jJdXE9b+b9F8CQT-LuxxO0PBCB-SZFfMVAdp+akqo4zfg@mail.gmail.com
* Handle empty result set in libpqrcv_execPeter Eisentraut2017-03-24
| | | | | | | | Always return tupleslot and tupledesc from libpqrcv_exec. This avoids requiring callers to handle that separately. Author: Petr Jelinek <petr.jelinek@2ndquadrant.com> Reported-by: Michael Banck <michael.banck@credativ.de>
* Allow SCRAM authentication, when pg_hba.conf says 'md5'.Heikki Linnakangas2017-03-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If a user has a SCRAM verifier in pg_authid.rolpassword, there's no reason we cannot attempt to perform SCRAM authentication instead of MD5. The worst that can happen is that the client doesn't support SCRAM, and the authentication will fail. But previously, it would fail for sure, because we would not even try. SCRAM is strictly more secure than MD5, so there's no harm in trying it. This allows for a more graceful transition from MD5 passwords to SCRAM, as user passwords can be changed to SCRAM verifiers incrementally, without changing pg_hba.conf. Refactor the code in auth.c to support that better. Notably, we now have to look up the user's pg_authid entry before sending the password challenge, also when performing MD5 authentication. Also simplify the concept of a "doomed" authentication. Previously, if a user had a password, but it had expired, we still performed SCRAM authentication (but always returned error at the end) using the salt and iteration count from the expired password. Now we construct a fake salt, like we do when the user doesn't have a password or doesn't exist at all. That simplifies get_role_password(), and we can don't need to distinguish the "user has expired password", and "user does not exist" cases in auth.c. On second thoughts, also rename uaSASL to uaSCRAM. It refers to the mechanism specified in pg_hba.conf, and while we use SASL for SCRAM authentication at the protocol level, the mechanism should be called SCRAM, not SASL. As a comparison, we have uaLDAP, even though it looks like the plain 'password' authentication at the protocol level. Discussion: https://www.postgresql.org/message-id/6425.1489506016@sss.pgh.pa.us Reviewed-by: Michael Paquier
* Fix backup cancelingTeodor Sigaev2017-03-24
| | | | | | | | | | | | | | | | | Assert-enabled build crashes but without asserts it works by wrong way: it may not reset forcing full page write and preventing from starting exclusive backup with the same name as cancelled. Patch replaces pair of booleans nonexclusive_backup_running/exclusive_backup_running to single enum to correctly describe backup state. Backpatch to 9.6 where bug was introduced Reported-by: David Steele Authors: Michael Paquier, David Steele Reviewed-by: Anastasia Lubennikova https://commitfest.postgresql.org/13/1068/
* Add ICU_FLAGS to one more placePeter Eisentraut2017-03-23
| | | | Reported-by: Thomas Munro <thomas.munro@enterprisedb.com>
* Fix crash in ICU patchPeter Eisentraut2017-03-23
| | | | This only happened with single-byte encodings.
* ICU supportPeter Eisentraut2017-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a column collprovider to pg_collation that determines which library provides the collation data. The existing choices are default and libc, and this adds an icu choice, which uses the ICU4C library. The pg_locale_t type is changed to a union that contains the provider-specific locale handles. Users of locale information are changed to look into that struct for the appropriate handle to use. Also add a collversion column that records the version of the collation when it is created, and check at run time whether it is still the same. This detects potentially incompatible library upgrades that can corrupt indexes and other structures. This is currently only supported by ICU-provided collations. initdb initializes the default collation set as before from the `locale -a` output but also adds all available ICU locales with a "-x-icu" appended. Currently, ICU-provided collations can only be explicitly named collations. The global database locales are still always libc-provided. ICU support is enabled by configure --with-icu. Reviewed-by: Thomas Munro <thomas.munro@enterprisedb.com> Reviewed-by: Andreas Karlsson <andreas@proxel.se>
* Track the oldest XID that can be safely looked up in CLOG.Robert Haas2017-03-23
| | | | | | | | | | | | | | This provides infrastructure for looking up arbitrary, user-supplied XIDs without a risk of scary-looking failures from within the clog module. Normally, the oldest XID that can be safely looked up in CLOG is the same as the oldest XID that can reused without causing wraparound, and the latter is already tracked. However, while truncation is in progress, the values are different, so we must keep track of them separately. Craig Ringer, reviewed by Simon Riggs and by me. Discussion: http://postgr.es/m/CAMsr+YHQiWNEi0daCTboS40T+V5s_+dst3PYv_8v2wNVH+Xx4g@mail.gmail.com
* Allow for parallel execution whenever ExecutorRun() is done only once.Robert Haas2017-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previously, it was unsafe to execute a plan in parallel if ExecutorRun() might be called with a non-zero row count. However, it's quite easy to fix things up so that we can support that case, provided that it is known that we will never call ExecutorRun() a second time for the same QueryDesc. Add infrastructure to signal this, and cross-checks to make sure that a caller who claims this is true doesn't later reneg. While that pattern never happens with queries received directly from a client -- there's no way to know whether multiple Execute messages will be sent unless the first one requests all the rows -- it's pretty common for queries originating from procedural languages, which often limit the result to a single tuple or to a user-specified number of tuples. This commit doesn't actually enable parallelism in any additional cases, because currently none of the places that would be able to benefit from this infrastructure pass CURSOR_OPT_PARALLEL_OK in the first place, but it makes it much more palatable to pass CURSOR_OPT_PARALLEL_OK in places where we currently don't, because it eliminates some cases where we'd end up having to run the parallel plan serially. Patch by me, based on some ideas from Rafia Sabih and corrected by Rafia Sabih based on feedback from Dilip Kumar and myself. Discussion: http://postgr.es/m/CA+TgmobXEhvHbJtWDuPZM9bVSLiTj-kShxQJ2uM5GPDze9fRYA@mail.gmail.com
* Reduce page locking in GIN vacuumTeodor Sigaev2017-03-23
| | | | | | | | | | | | | GIN vacuum during cleaning posting tree can lock this whole tree for a long time with by holding LockBufferForCleanup() on root. Patch changes it with two ways: first, cleanup lock will be taken only if there is an empty page (which should be deleted) and, second, it tries to lock only subtree, not the whole posting tree. Author: Andrey Borodin with minor editorization by me Reviewed-by: Jeff Davis, me https://commitfest.postgresql.org/13/896/
* Assorted compilation and test fixesPeter Eisentraut2017-03-23
| | | | | | related to 7c4f52409a8c7d85ed169bbbc1f6092274d03920, per build farm Author: Petr Jelinek <petr.jelinek@2ndquadrant.com>
* Minor spelling correction in commentSimon Riggs2017-03-23
| | | | Jon Nelson
* Replication lag tracking for walsendersSimon Riggs2017-03-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | Adds write_lag, flush_lag and replay_lag cols to pg_stat_replication. Implements a lag tracker module that reports the lag times based upon measurements of the time taken for recent WAL to be written, flushed and replayed and for the sender to hear about it. These times represent the commit lag that was (or would have been) introduced by each synchronous commit level, if the remote server was configured as a synchronous standby. For an asynchronous standby, the replay_lag column approximates the delay before recent transactions became visible to queries. If the standby server has entirely caught up with the sending server and there is no more WAL activity, the most recently measured lag times will continue to be displayed for a short time and then show NULL. Physical replication lag tracking is automatic. Logical replication tracking is possible but is the responsibility of the logical decoding plugin. Tracking is a private module operating within each walsender individually, with values reported to shared memory. Module not used outside of walsender. Design and code is good enough now to commit - kudos to the author. In many ways a difficult topic, with important and subtle behaviour so this shoudl be expected to generate discussion and multiple open items: Test now! Author: Thomas Munro, following designs by Fujii Masao and Simon Riggs Review: Simon Riggs, Ian Barwick and Craig Ringer
* Logical replication support for initial data copyPeter Eisentraut2017-03-23
| | | | | | | | | | | | | | | | | | | | | | | Add functionality for a new subscription to copy the initial data in the tables and then sync with the ongoing apply process. For the copying, add a new internal COPY option to have the COPY source data provided by a callback function. The initial data copy works on the subscriber by receiving COPY data from the publisher and then providing it locally into a COPY that writes to the destination table. A WAL receiver can now execute full SQL commands. This is used here to obtain information about tables and publications. Several new options were added to CREATE and ALTER SUBSCRIPTION to control whether and when initial table syncing happens. Change pg_dump option --no-create-subscription-slots to --no-subscription-connect and use the new CREATE SUBSCRIPTION ... NOCONNECT option for that. Author: Petr Jelinek <petr.jelinek@2ndquadrant.com> Tested-by: Erik Rijkers <er@xs4all.nl>
* Fix grammar in commentMagnus Hagander2017-03-23
| | | | Author: Emil Iggland
* Expose waitforarchive option through pg_stop_backup()Stephen Frost2017-03-22
| | | | | | | | | | | | | | | | | Internally, we have supported the option to either wait for all of the WAL associated with a backup to be archived, or to return immediately. This option is useful to users of pg_stop_backup() as well, when they are reading the stop backup record position and checking that the WAL they need has been archived independently. This patch adds an additional, optional, argument to pg_stop_backup() which allows the user to indicate if they wish to wait for the WAL to be archived or not. The default matches current behavior, which is to wait. Author: David Steele, with some minor changes, doc updates by me. Reviewed by: Takayuki Tsunakawa, Fujii Masao Discussion: https://postgr.es/m/758e3fd1-45b4-5e28-75cd-e9e7f93a4c02@pgmasters.net
* Fix wrong costing of Sort under Gather Merge.Robert Haas2017-03-22
| | | | | | | | | There's no mechanism for such a sort to become a top-N sort, so we should pass -1 rather than limit_tuples to cost_sort(). Rushabh Lathia, per a report from Mithun Cy Discussion: http://postgr.es/m/CAGPqQf1akRcSgC9=6iwx=sEPap9UvPpHJLzg8_N+OuHdb6fL+g@mail.gmail.com
* Support multiple RADIUS serversMagnus Hagander2017-03-22
| | | | | | | | This changes all the RADIUS related parameters (radiusserver, radiussecret, radiusport, radiusidentifier) to be plural and to accept a comma separated list of servers, which will be tried in order. Reviewed by Adam Brightwell
* Correct erroneous comment in GetOldestXmin()Simon Riggs2017-03-22
| | | | Craig Ringer
* Refactor GetOldestXmin() to use flagsSimon Riggs2017-03-22
| | | | | | | Replace ignoreVacuum parameter with more flexible flags. Author: Eiji Seki Review: Haribabu Kommi
* Assign AccessExclusiveLocks against subxacts in Hot StandbySimon Riggs2017-03-22
| | | | | | | | | | | | Previously AELs were registered against the top-level xid, which could cause locks to be held much longer than necessary in some cases during Hot Standby replay. We now record locks directly against their appropriate xids. Requires few code changes because original code allowed for this situation but didn’t fully implement it. Discussion: CAKJS1f9vJ841HY=wonnLVbfkTWGYWdPN72VMxnArcGCjF3SywA@mail.gmail.com Author: Simon Riggs and David Rowley
* Change logical replication pg_hba.conf usePeter Eisentraut2017-03-22
| | | | | | | | Logical replication no longer uses the "replication" keyword. It just matches database entries in the normal way. The "replication" keyword now only applies to physical replication. Reviewed-by: Petr Jelinek <petr.jelinek@2ndquadrant.com>
* Refine rules for altering publication ownerPeter Eisentraut2017-03-22
| | | | | | | Previously, the new owner had to be a superuser. The new rules are more refined similar to other objects. Reviewed-by: Petr Jelinek <petr.jelinek@2ndquadrant.com>
* Improve performance of replay of AccessExclusiveLocksSimon Riggs2017-03-22
| | | | | | | | | | | | | | | | | | | | A hot standby replica keeps a list of Access Exclusive locks for a top level transaction. These locks are released when the top level transaction ends. Searching of this list is O(N^2), and each transaction had to pay the price of searching this list for locks, even if it didn't take any AE locks itself. This patch optimizes this case by having the master server track which transactions took AE locks, and passes that along to the standby server in the commit/abort record. This allows the standby to only try to release locks for transactions which actually took any, avoiding the majority of the performance issue. Refactor MyXactAccessedTempRel into MyXactFlags to allow minimal additional cruft with this. Analysis and initial patch by David Rowley Author: David Rowley and Simon Riggs
* Teach xlogreader to follow timeline switchesSimon Riggs2017-03-22
| | | | | | | | | | Uses page-based mechanism to ensure we’re using the correct timeline. Tests are included to exercise the functionality using a cold disk-level copy of the master that's started up as a replica with slots intact, but the intended use of the functionality is with later features. Craig Ringer, reviewed by Simon Riggs and Andres Freund
* Don't scan partitioned tables.Robert Haas2017-03-21
| | | | | | | | | | | | | | | | | | | Partitioned tables do not contain any data; only their unpartitioned descendents need to be scanned. However, the partitioned tables still need to be locked, even though they're not scanned. To make that work, Append and MergeAppend relations now need to carry a list of (unscanned) partitioned relations that must be locked, and InitPlan must lock all partitioned result relations. Aside from the obvious advantage of avoiding some work at execution time, this has two other advantages. First, it may improve the planner's decision-making in some cases since the empty relation might throw things off. Second, it paves the way to getting rid of the storage for partitioned tables altogether. Amit Langote, reviewed by me. Discussion: http://postgr.es/m/6837c359-45c4-8044-34d1-736756335a15@lab.ntt.co.jp
* Fix support for some operators (&<, &>, $<|, |&>) in box operator classTeodor Sigaev2017-03-21
| | | | | | | | | | | | of SP-GiST. Bug exists since initial commit of box opclass for SP-GiST, so backpath to 9.6 Author: Nikita Glukhov with minor editorization of tests by me Reviewed-by: Kyotaro Horiguchi, Anastasia Lubennikova https://commitfest.postgresql.org/13/981/
* Add a direct function call mechanism using the caller's context.Andrew Dunstan2017-03-21
| | | | | | | | | | | | | | | | The current DirectFunctionCall functions use NULL as the flinfo in initializing the FunctionCallInfoData for the call. That means the called function has no fn_mcxt or fn_extra to work with, and attempting to do so will result in an access violation. These functions instead use the provided flinfo, which will usually be the caller's own flinfo. The caller needs to ensure that it doesn't use the fn_extra in way that is incompatible with the way the called function will use it. The called function should not rely on anything else in the provided context, as it will be relevant to the caller, not the callee. Original code from Tom Lane. Discussion: https://postgr.es/m/db2b70a4-78d7-294a-a315-8e7f506c5978@2ndQuadrant.com
* Add missing support for new node fieldsAndrew Dunstan2017-03-20
| | | | | | | Commit b6fb534f added two new node fields but neglected to add copy and comparison support for them, Mea culpa, should have checked for that. per buildfarm animals with -DCOPY_PARSE_PLAN_TREES
* Add IF NOT EXISTS for CREATE SERVER and CREATE USER MAPPINGAndrew Dunstan2017-03-20
| | | | | | | | | | | | | There is still some inconsistency with the error messages surrounding foreign servers. Some use the word "foreign" and some don't. My inclination is to remove all such uses of "foreign" on the basis that the CREATE/ALTER/DROP SERVER commands don't use the word. However, that is left for another day. In this patch I have kept to the existing usage in the affected commands, which omits "foreign". Anastasia Lubennikova, reviewed by Arthur Zakirov and Ashtosh Bapat. Discussion: http://postgr.es/m/7c2ab9b8-388a-1ce0-23a3-7acf2a0ed3c6@postgrespro.ru
* Use a consistent error message style for user mappings.Andrew Dunstan2017-03-20
| | | | | | | | | | | | User mappings are essentially anonymous, so messages referring to "user mapping foo on server bar" are wrong, and inconsistent with other error messages referring to user mappings. To be consistent with existing use, use "user mapping for foo on server bar" instead. I dropped the noise word "user" from the original suggestion to be consistent with other uses. Discussion: http://postgr.es/m/56c6f8ab-b2d6-f1fa-deb0-1d18cf67f7b9@2ndQuadrant.com
* Another fix for single-page hash index vacuum.Robert Haas2017-03-20
| | | | | | | | | The WAL consistency checking code needed to be updated for the new page status bit, but that didn't get done previously. Ashutosh Sharma, reviewed by Amit Kapila Discussion: http://postgr.es/m/CAA4eK1LP_oz4EfMen14OjJuzN5CqPdfRkFFuA-MfkcfeE8zGyg@mail.gmail.com
* Fixes for single-page hash index vacuum.Robert Haas2017-03-20
| | | | | | | | | | | | | | Clear LH_PAGE_HAS_DEAD_TUPLES during replay, similar to what gets done for btree. Update hashdesc.c for xl_hash_vacuum_one_page. Oversights in commit 6977b8b7f4dfb40896ff5e2175cad7fdbda862eb spotted by Amit Kapila. Patch by Ashutosh Sharma. Bump WAL version. The original patch to make hash indexes write-ahead logged probably should have done this, and the single page vacuuming patch probably should have done it again, but better late than never. Discussion: http://postgr.es/m/CAA4eK1Kd=mJ9xreovcsh0qMiAj-QqCphHVQ_Lfau1DR9oVjASQ@mail.gmail.com
* Revert unintentional change in increasing usage count during pin of buffers,Teodor Sigaev2017-03-20
| | | | | | | | | | | | this makes buffer access strategy have no effect. Change was a part of commit 48354581a49c30f5757c203415aa8412d85b0f70 during 9.6 release cycle, so backpath to 9.6 Reported-by: Jim Nasby Author: Alexander Korotkov Reviewed-by: Jim Nasby, Andres Freund https://commitfest.postgresql.org/13/1029/
* Avoid use of already-closed relcache entry.Tom Lane2017-03-18
| | | | Oversight in commit 17f8ffa1e. Per buildfarm member prion.
* Fix REFRESH MATERIALIZED VIEW to report activity to the stats collector.Tom Lane2017-03-18
| | | | | | | | | | | | | | | | | | | | | | | The non-concurrent code path for REFRESH MATERIALIZED VIEW failed to report its updates to the stats collector. This is bad since it means auto-analyze doesn't know there's any work to be done. Adjust it to report the refresh as a table truncate followed by insertion of an appropriate number of rows. Since a matview could contain more than INT_MAX rows, change the signature of pgstat_count_heap_insert() to accept an int64 rowcount. (The accumulator it's adding into is already int64, but existing callers could not insert more than a small number of rows at once, so the argument had been declared just "int n".) This is surely a bug fix, but changing pgstat_count_heap_insert()'s API seems too risky for the back branches. Given the lack of previous complaints, I'm not sure it's a big enough problem to justify a kluge solution that would avoid that. So, no back-patch, at least for now. Jim Mlodgenski, adjusted a bit by me Discussion: https://postgr.es/m/CAB_5SRchSz7-WmdO5szdiknG8Oj_GGqJytrk1KRd11yhcMs1KQ@mail.gmail.com
* Create and use wait events for read, write, and fsync operations.Robert Haas2017-03-18
| | | | | | | | | | | | | Previous commits, notably 53be0b1add7064ca5db3cd884302dfc3268d884e and 6f3bd98ebfc008cbd676da777bb0b2376c4c4bfa, made it possible to see from pg_stat_activity when a backend was stuck waiting for another backend, but it's also fairly common for a backend to be stuck waiting for an I/O. Add wait events for those operations, too. Rushabh Lathia, with further hacking by me. Reviewed and tested by Michael Paquier, Amit Kapila, Rajkumar Raghuwanshi, and Rahila Syed. Discussion: http://postgr.es/m/CAGPqQf0LsYHXREPAZqYGVkDqHSyjf=KsD=k0GTVPAuzyThh-VQ@mail.gmail.com
* Fix WaitEventSetWait() to handle write-ready waits properly on Windows.Tom Lane2017-03-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | Windows apparently will not detect socket write-ready events unless a preceding send attempt returned WSAEWOULDBLOCK. In many usage patterns that's satisfied by the caller of WaitEvenSetWait(), but not always. Apply the same solution that we already had in pgwin32_select(), namely to perform a dummy WSASend() call with len=0. This will return WSAEWOULDBLOCK if there's no buffer space (even though it could legitimately do nothing and report success, which makes me a bit nervous about this solution; but since it's been working fine in libpq, let's roll with it). In passing, improve the comments about this in pgwin32_select(), and remove duplicated code there. Back-patch to 9.6 where WaitEventSetWait() was introduced. We might need to back-patch something similar into predecessor code. But given the lack of complaints so far, it's not clear that the case ever gets exercised in the back branches, so I'm not going to expend effort on it right now. This should resolve recurring failures on buildfarm member bowerbird, which has been failing since 1e8a85009 went in. Diagnosis and patch by Petr Jelinek, cosmetic adjustments by me. Discussion: https://postgr.es/m/5b6a6d6d-fb45-0afb-2e95-5600063c3dbd@2ndquadrant.com
* Rename "pg_clog" directory to "pg_xact".Robert Haas2017-03-17
| | | | | | | | | | | Names containing the letters "log" sometimes confuse users into believing that only non-critical data is present. It is hoped this renaming will discourage ill-considered removals of transaction status data. Michael Paquier Discussion: http://postgr.es/m/CA+Tgmoa9xFQyjRZupbdEFuwUerFTvC6HjZq1ud6GYragGDFFgA@mail.gmail.com
* Allow plaintext 'password' authentication when user has a SCRAM verifier.Heikki Linnakangas2017-03-17
| | | | Oversight in the main SCRAM patch.