Second pass on 9.6.3 release notes.
Improve description of logical decoding snapshot issues, per suggestion from Petr Jelinek. Mention possible need to re-sync logical replicas as a post-upgrade task. Minor copy-editing for some other items.
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Tom Lane
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@ -23,7 +23,12 @@
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</para>
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<para>
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However, if you are upgrading from a version earlier than 9.6.2,
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However, if you are using third-party replication tools that depend
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on <quote>logical decoding</>, see the first changelog entry below.
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</para>
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<para>
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Also, if you are upgrading from a version earlier than 9.6.2,
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see <xref linkend="release-9-6-2">.
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</para>
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</sect2>
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@ -35,6 +40,40 @@
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<listitem>
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<!--
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Author: Andres Freund <andres@anarazel.de>
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Branch: master [2bef06d51] 2017-04-27 13:13:36 -0700
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Branch: REL9_6_STABLE [28afff347] 2017-04-27 13:13:36 -0700
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Branch: REL9_5_STABLE [47f896b5c] 2017-04-27 13:13:37 -0700
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Branch: REL9_4_STABLE [5da646138] 2017-04-27 13:13:37 -0700
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Branch: master [56e19d938] 2017-04-27 15:29:15 -0700
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Branch: REL9_6_STABLE [29e8c881d] 2017-04-27 15:29:33 -0700
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Branch: REL9_5_STABLE [54270d7eb] 2017-04-27 15:29:43 -0700
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Branch: REL9_4_STABLE [b6ecf26cc] 2017-04-27 15:29:52 -0700
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-->
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<para>
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Fix possibly-invalid initial snapshot during logical decoding
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(Petr Jelinek, Andres Freund)
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</para>
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<para>
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The initial snapshot created for a logical decoding replication slot
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was potentially incorrect. This could cause third-party tools that
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use logical decoding to copy incomplete/inconsistent initial data.
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This was more likely to happen if the source server was busy at the
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time of slot creation, or if another logical slot already existed.
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</para>
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<para>
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If you are using a replication tool that depends on logical decoding,
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and it should have copied a nonempty data set at the start of
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replication, it is advisable to recreate the replica after
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installing this update, or to verify its contents against the source
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server.
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Robert Haas <rhaas@postgresql.org>
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Branch: master [87f998203] 2017-03-14 11:51:11 -0400
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Branch: REL9_6_STABLE [36fcb36b8] 2017-03-14 11:52:27 -0400
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@ -81,33 +120,6 @@ Branch: REL9_2_STABLE [952e33b05] 2017-04-23 13:10:58 -0400
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<listitem>
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<!--
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Author: Andres Freund <andres@anarazel.de>
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Branch: master [2bef06d51] 2017-04-27 13:13:36 -0700
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Branch: REL9_6_STABLE [28afff347] 2017-04-27 13:13:36 -0700
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Branch: REL9_5_STABLE [47f896b5c] 2017-04-27 13:13:37 -0700
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Branch: REL9_4_STABLE [5da646138] 2017-04-27 13:13:37 -0700
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Branch: master [56e19d938] 2017-04-27 15:29:15 -0700
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Branch: REL9_6_STABLE [29e8c881d] 2017-04-27 15:29:33 -0700
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Branch: REL9_5_STABLE [54270d7eb] 2017-04-27 15:29:43 -0700
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Branch: REL9_4_STABLE [b6ecf26cc] 2017-04-27 15:29:52 -0700
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-->
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<para>
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Fix possibly-corrupt initial snapshot during logical decoding
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(Petr Jelinek, Andres Freund)
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</para>
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<para>
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If a logical decoding replication slot was created while another slot
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already exists, it was initialized with a potentially-corrupted
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snapshot, allowing wrong data to be returned during decoding.
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The time window during which this snapshot continued to be used
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depended on how busy the server was; under low load it would be hard
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to see any problem.
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</para>
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</listitem>
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<listitem>
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<!--
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Author: Fujii Masao <fujii@postgresql.org>
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Branch: master [1d04a59be] 2017-02-22 03:11:58 +0900
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Branch: REL9_6_STABLE [9fab155c6] 2017-02-22 08:29:32 +0900
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@ -142,15 +154,15 @@ Branch: master [aa1351f1e] 2017-04-26 16:17:34 -0400
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Branch: REL9_6_STABLE [e880df25e] 2017-04-26 16:17:29 -0400
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-->
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<para>
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Prevent delays in postmaster's launching of parallel worker processes
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(Tom Lane)
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Prevent delays in postmaster's launching of multiple parallel worker
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processes (Tom Lane)
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</para>
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<para>
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There could be a significant delay (up to tens of seconds) before
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satisfying a query's request for more than one worker process. On most
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platforms this required unlucky timing, but on some it was the typical
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case.
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satisfying a query's request for more than one worker process, or when
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multiple queries requested workers simultaneously. On most platforms
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this required unlucky timing, but on some it was the typical case.
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</para>
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</listitem>
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@ -168,8 +180,8 @@ Branch: REL9_4_STABLE [436b560b8] 2017-04-24 12:16:58 -0400
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</para>
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<para>
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Previously, the postmaster partially updated its state as though
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the process had been successfully launched, resulting in subsequent
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Previously, the postmaster updated portions of its state as though
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the process had been launched successfully, resulting in subsequent
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confusion.
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</para>
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</listitem>
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@ -227,7 +239,7 @@ Branch: REL9_5_STABLE [6f0f98bb0] 2017-04-17 15:29:00 -0400
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<para>
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This optimization supposed that retrieving all columns of a tuple
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is inexpensive, which is true for ordinary Postgres tuples; but it
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might not be the case at all for a custom scan provider.
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might not be the case for a custom scan provider.
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</para>
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</listitem>
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@ -271,7 +283,7 @@ Branch: REL9_2_STABLE [27a8c8033] 2017-02-12 16:05:23 -0500
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<para>
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The command failed if the calling user did not currently have
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privileges to use the tablespace an index had been created in.
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<literal>CREATE</> privilege for the tablespace containing the index.
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That behavior seems unhelpful, so skip the check, allowing the
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index to be rebuilt where it is.
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</para>
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@ -289,7 +301,7 @@ Branch: REL9_2_STABLE [f60f0c8fe] 2017-04-28 14:55:42 -0400
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-->
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<para>
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Fix <command>ALTER TABLE ... VALIDATE CONSTRAINT</> to not recurse
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to child tables if the constraint is marked <literal>NO INHERIT</>
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to child tables when the constraint is marked <literal>NO INHERIT</>
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(Amit Langote)
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</para>
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@ -404,7 +416,7 @@ Branch: REL9_4_STABLE [8851bcf88] 2017-04-05 23:51:28 -0400
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-->
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<para>
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Fix integer-overflow problems in <type>interval</> comparison (Kyotaro
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Horiguchi and Tom Lane)
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Horiguchi, Tom Lane)
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</para>
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<para>
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@ -682,9 +694,9 @@ Branch: REL9_6_STABLE [4e8b2fd33] 2017-02-17 15:06:34 -0500
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</para>
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<para>
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This resulted in <application>pg_dump</> always thinking that the
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language had no initial privileges; since that's true for most
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procedural languages, bad effects from this bug are probably rare.
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This resulted in <application>pg_dump</> always believing that the
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language had no initial privileges. Since that's true for most
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procedural languages, ill effects from this bug are probably rare.
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</para>
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</listitem>
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@ -763,8 +775,8 @@ Branch: REL9_3_STABLE [f6cfc14e5] 2017-03-11 13:33:22 -0800
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Branch: REL9_2_STABLE [c4613c3f4] 2017-03-11 13:33:30 -0800
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-->
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<para>
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In <filename>contrib/dblink</>, avoid connection leak when establishing
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a new unnamed connection (Joe Conway)
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In <filename>contrib/dblink</>, avoid leaking the previous unnamed
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connection when establishing a new unnamed connection (Joe Conway)
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</para>
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</listitem>
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