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tvondratvondra
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Add decoding of sequences to built-in replication
This commit adds support for decoding of sequences to the built-in replication (the infrastructure was added by commit 0da92dc). The syntax and behavior mostly mimics handling of tables, i.e. a publication may be defined as FOR ALL SEQUENCES (replicating all sequences in a database), FOR ALL SEQUENCES IN SCHEMA (replicating all sequences in a particular schema) or individual sequences. To publish sequence modifications, the publication has to include 'sequence' action. The protocol is extended with a new message, describing sequence increments. A new system view pg_publication_sequences lists all the sequences added to a publication, both directly and indirectly. Various psql commands (\d and \dRp) are improved to also display publications including a given sequence, or sequences included in a publication. Author: Tomas Vondra, Cary Huang Reviewed-by: Peter Eisentraut, Amit Kapila, Hannu Krosing, Andres Freund, Petr Jelinek Discussion: https://postgr.es/m/d045f3c2-6cfb-06d3-5540-e63c320df8bc@enterprisedb.com Discussion: https://postgr.es/m/1710ed7e13b.cd7177461430746.3372264562543607781@highgo.ca
1 parent 0adb3dc commit 75b1521

40 files changed

+3235
-468
lines changed

‎doc/src/sgml/catalogs.sgml

+81
Original file line numberDiff line numberDiff line change
@@ -6281,6 +6281,16 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
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Reference to schema
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>pntype</structfield> <type>char</type>
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Determines which object type is included from this schema.
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</para>
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<para>
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Reference to schema
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</para></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
@@ -9598,6 +9608,11 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
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<entry>prepared transactions</entry>
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</row>
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<row>
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<entry><link linkend="view-pg-publication-sequences"><structname>pg_publication_sequences</structname></link></entry>
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<entry>publications and their associated sequences</entry>
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</row>
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<row>
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<entry><link linkend="view-pg-publication-tables"><structname>pg_publication_tables</structname></link></entry>
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<entry>publications and their associated tables</entry>
@@ -11433,6 +11448,72 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
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</sect1>
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<sect1 id="view-pg-publication-sequences">
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<title><structname>pg_publication_sequences</structname></title>
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<indexterm zone="view-pg-publication-sequences">
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<primary>pg_publication_sequences</primary>
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</indexterm>
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<para>
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The view <structname>pg_publication_sequences</structname> provides
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information about the mapping between publications and the sequences they
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contain. Unlike the underlying catalog
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<link linkend="catalog-pg-publication-rel"><structname>pg_publication_rel</structname></link>,
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this view expands
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publications defined as <literal>FOR ALL SEQUENCES</literal>, so for such
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publications there will be a row for each eligible sequence.
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</para>
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<table>
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<title><structname>pg_publication_sequences</structname> Columns</title>
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<tgroup cols="1">
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<thead>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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Column Type
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</para>
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<para>
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Description
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</para></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>pubname</structfield> <type>name</type>
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(references <link linkend="catalog-pg-publication"><structname>pg_publication</structname></link>.<structfield>pubname</structfield>)
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</para>
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<para>
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Name of publication
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>schemaname</structfield> <type>name</type>
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(references <link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.<structfield>nspname</structfield>)
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</para>
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<para>
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Name of schema containing sequence
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>sequencename</structfield> <type>name</type>
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(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>relname</structfield>)
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</para>
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<para>
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Name of sequence
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</para></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1 id="view-pg-publication-tables">
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<title><structname>pg_publication_tables</structname></title>
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‎doc/src/sgml/protocol.sgml

+119
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@@ -7065,6 +7065,125 @@ Relation
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</listitem>
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</varlistentry>
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<varlistentry id="protocol-logicalrep-message-formats-Sequence">
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<term>
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Sequence
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</term>
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<listitem>
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<para>
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<variablelist>
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<varlistentry>
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<term>
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Byte1('X')
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</term>
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<listitem>
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<para>
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Identifies the message as a sequence message.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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Int32 (TransactionId)
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</term>
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<listitem>
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<para>
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Xid of the transaction (only present for streamed transactions).
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This field is available since protocol version 2.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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Int8(0)
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</term>
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<listitem>
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<para>
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Flags; currently unused.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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Int64 (XLogRecPtr)
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</term>
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<listitem>
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<para>
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The LSN of the sequence increment.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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String
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</term>
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<listitem>
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<para>
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Namespace (empty string for <literal>pg_catalog</literal>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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String
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</term>
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<listitem>
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<para>
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Relation name.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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Int8
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</term>
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<listitem>
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<para>
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1 if the sequence update is transactions, 0 otherwise.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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Int64
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</term>
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<listitem>
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<para>
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<structfield>last_value</structfield> value of the sequence.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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Int64
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</term>
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<listitem>
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<para>
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<structfield>log_cnt</structfield> value of the sequence.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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Int8
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</term>
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<listitem>
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<para>
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<structfield>is_called</structfield> value of the sequence.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="protocol-logicalrep-message-formats-Type">
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<term>
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Type

‎doc/src/sgml/ref/alter_publication.sgml

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@@ -31,7 +31,9 @@ ALTER PUBLICATION <replaceable class="parameter">name</replaceable> RENAME TO <r
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<phrase>where <replaceable class="parameter">publication_object</replaceable> is one of:</phrase>
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TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [ WHERE ( <replaceable class="parameter">expression</replaceable> ) ] [, ... ]
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SEQUENCE <replaceable class="parameter">sequence_name</replaceable> [, ... ]
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ALL TABLES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]
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ALL SEQUENCES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]
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</synopsis>
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</refsynopsisdiv>
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@@ -44,13 +46,13 @@ ALTER PUBLICATION <replaceable class="parameter">name</replaceable> RENAME TO <r
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</para>
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<para>
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The first three variants change which tables/schemas are part of the
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publication. The <literal>SET</literal> clause will replace the list of
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tables/schemas in the publication with the specified list; the existing
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tables/schemas that were present in the publication will be removed. The
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<literal>ADD</literal> and <literal>DROP</literal> clauses will add and
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remove one or more tables/schemas from the publication. Note that adding
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tables/schemas to a publication that is already subscribed to will require an
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The first three variants change which objects (tables, sequences or schemas)
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are part of the publication. The <literal>SET</literal> clause will replace
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the list of objects in the publication with the specified list; the existing
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objects that were present in the publication will be removed.
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The <literal>ADD</literal> and <literal>DROP</literal> clauses will add and
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remove one or more objects from the publication. Note that adding objects
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to a publication that is already subscribed to will require an
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<literal>ALTER SUBSCRIPTION ... REFRESH PUBLICATION</literal> action on the
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subscribing side in order to become effective. Note also that the combination
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of <literal>DROP</literal> with a <literal>WHERE</literal> clause is not
@@ -122,6 +124,15 @@ ALTER PUBLICATION <replaceable class="parameter">name</replaceable> RENAME TO <r
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">sequence_name</replaceable></term>
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<listitem>
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<para>
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Name of an existing sequence.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">schema_name</replaceable></term>
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<listitem>

‎doc/src/sgml/ref/alter_subscription.sgml

+4-4
Original file line numberDiff line numberDiff line change
@@ -148,8 +148,8 @@ ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> RENAME TO <
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<listitem>
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<para>
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Fetch missing table information from publisher. This will start
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replication of tables that were added to the subscribed-to publications
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since <command>CREATE SUBSCRIPTION</command> or
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replication of tables and sequences that were added to the subscribed-to
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publications since <command>CREATE SUBSCRIPTION</command> or
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the last invocation of <command>REFRESH PUBLICATION</command>.
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</para>
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@@ -167,8 +167,8 @@ ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> RENAME TO <
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The default is <literal>true</literal>.
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</para>
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<para>
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Previously subscribed tables are not copied, even if a table's row
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filter <literal>WHERE</literal> clause has since been modified.
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Previously subscribed tables and sequences are not copied, even if a
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table's row filter <literal>WHERE</literal> clause has since been modified.
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</para>
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</listitem>
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</varlistentry>

‎doc/src/sgml/ref/create_publication.sgml

+36-15
Original file line numberDiff line numberDiff line change
@@ -22,14 +22,21 @@ PostgreSQL documentation
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<refsynopsisdiv>
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<synopsis>
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CREATE PUBLICATION <replaceable class="parameter">name</replaceable>
25-
[ FOR ALL TABLES
25+
[ FOR ALL <replaceable class="parameter">object_type</replaceable> [, ...]
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| FOR <replaceable class="parameter">publication_object</replaceable> [, ... ] ]
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[ WITH ( <replaceable class="parameter">publication_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] ) ]
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<phrase>where <replaceable class="parameter">object type</replaceable> is one of:</phrase>
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TABLES
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SEQUENCES
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<phrase>where <replaceable class="parameter">publication_object</replaceable> is one of:</phrase>
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TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [ WHERE ( <replaceable class="parameter">expression</replaceable> ) ] [, ... ]
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SEQUENCE <replaceable class="parameter">sequence_name</replaceable> [ * ] [, ... ]
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ALL TABLES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]
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ALL SEQUENCES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]
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</synopsis>
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</refsynopsisdiv>
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@@ -107,27 +114,43 @@ CREATE PUBLICATION <replaceable class="parameter">name</replaceable>
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</listitem>
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</varlistentry>
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117+
<varlistentry>
118+
<term><literal>FOR SEQUENCE</literal></term>
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<listitem>
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<para>
121+
Specifies a list of sequences to add to the publication.
122+
</para>
123+
124+
<para>
125+
Specifying a sequence that is part of a schema specified by <literal>FOR
126+
ALL SEQUENCES IN SCHEMA</literal> is not supported.
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</para>
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</listitem>
129+
</varlistentry>
130+
110131
<varlistentry>
111132
<term><literal>FOR ALL TABLES</literal></term>
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<term><literal>FOR ALL SEQUENCES</literal></term>
112134
<listitem>
113135
<para>
114-
Marks the publication as one that replicates changes for all tables in
115-
the database, including tables created in the future.
136+
Marks the publication as one that replicates changes for all tables/sequences in
137+
the database, including tables/sequences created in the future.
116138
</para>
117139
</listitem>
118140
</varlistentry>
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120142
<varlistentry>
121143
<term><literal>FOR ALL TABLES IN SCHEMA</literal></term>
144+
<term><literal>FOR ALL SEQUENCES IN SCHEMA</literal></term>
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<listitem>
123146
<para>
124-
Marks the publication as one that replicates changes for all tables in
125-
the specified list of schemas, including tables created in the future.
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Marks the publication as one that replicates changes for all sequences/tables in
148+
the specified list of schemas, including sequences/tables created in the future.
126149
</para>
127150

128151
<para>
129-
Specifying a schema along with a table which belongs to the specified
130-
schema using <literal>FOR TABLE</literal> is not supported.
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Specifying a schema along with a sequence/table which belongs to the specified
153+
schema using <literal>FOR SEQUENCE</literal>/<literal>FOR TABLE</literal> is not supported.
131154
</para>
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<para>
@@ -202,10 +225,9 @@ CREATE PUBLICATION <replaceable class="parameter">name</replaceable>
202225
<title>Notes</title>
203226

204227
<para>
205-
If <literal>FOR TABLE</literal>, <literal>FOR ALL TABLES</literal> or
206-
<literal>FOR ALL TABLES IN SCHEMA</literal> are not specified, then the
207-
publication starts out with an empty set of tables. That is useful if
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tables or schemas are to be added later.
228+
If <literal>FOR TABLE</literal>, <literal>FOR SEQUENCE</literal>, etc. is
229+
not specified, then the publication starts out with an empty set of tables
230+
and sequences. That is useful if objects are to be added later.
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</para>
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211233
<para>
@@ -220,10 +242,9 @@ CREATE PUBLICATION <replaceable class="parameter">name</replaceable>
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</para>
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222244
<para>
223-
To add a table to a publication, the invoking user must have ownership
224-
rights on the table. The <command>FOR ALL TABLES</command> and
225-
<command>FOR ALL TABLES IN SCHEMA</command> clauses require the invoking
226-
user to be a superuser.
245+
To add a table or a sequence to a publication, the invoking user must
246+
have ownership rights on the object. The <command>FOR ALL ...</command>
247+
clauses require the invoking user to be a superuser.
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</para>
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<para>

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