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Doc: minor improvements for logical replication protocol documentation. 

Where appropriate, annotate message field data types with the backend
code's name for the data type, eg XLogRecPtr or TimestampTz.  Previously
we just said "Int64" which didn't provide as much info.

Also clarify references to object OIDs, and make use of the existing
convention to denote the value of a field that must have a fixed value.

Vignesh C, reviewed by Peter Smith and Euler Taveira.

Discussion: https://postgr.es/m/CALDaNm0+fatx57KFcBopUZWQpH_tz3WKKfm-_eiTwcXui5BnhQ@mail.gmail.com
This commit is contained in:
Tom Lane 2021-08-02 11:32:17 -04:00
parent 7ff23c6d27
commit a5cb4f9829
1 changed files with 110 additions and 69 deletions
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179
doc/src/sgml/protocol.sgml
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@ -2892,7 +2892,7 @@ The commands accepted in replication mode are:
belong to the same transaction. Similarly, all messages between a pair of
Begin Prepare and Prepare messages belong to the same transaction.
It also sends changes of large in-progress transactions between a pair of
Stream Start and Stream Stop messages. The last stream of such a transaction
Stream Start and Stream Stop messages. The last stream of such a transaction
contains a Stream Commit or Stream Abort message.
</para>
@ -6407,11 +6407,12 @@ not line breaks.
<title>Logical Replication Message Formats</title>
<para>
This section describes the detailed format of each logical replication message.
These messages are returned either by the replication slot SQL interface or are
sent by a walsender. In case of a walsender they are encapsulated inside the replication
protocol WAL messages as described in <xref linkend="protocol-replication"/>
and generally obey same message flow as physical replication.
This section describes the detailed format of each logical replication
message. These messages are either returned by the replication slot SQL
interface or are sent by a walsender. In the case of a walsender they are
encapsulated inside replication protocol WAL messages as described in
<xref linkend="protocol-replication"/>, and generally obey the same message
flow as physical replication.
</para>
<variablelist>
@ -6436,7 +6437,7 @@ Begin
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (XLogRecPtr)
</term>
<listitem>
<para>
@ -6446,7 +6447,7 @@ Begin
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (TimestampTz)
</term>
<listitem>
<para>
@ -6457,7 +6458,7 @@ Begin
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -6491,7 +6492,7 @@ Message
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -6513,7 +6514,7 @@ Message
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (XLogRecPtr)
</term>
<listitem>
<para>
@ -6579,17 +6580,17 @@ Commit
</varlistentry>
<varlistentry>
<term>
Int8
Int8(0)
</term>
<listitem>
<para>
Flags; currently unused (must be 0).
Flags; currently unused.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (XLogRecPtr)
</term>
<listitem>
<para>
@ -6599,7 +6600,7 @@ Commit
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (XLogRecPtr)
</term>
<listitem>
<para>
@ -6609,7 +6610,7 @@ Commit
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (TimestampTz)
</term>
<listitem>
<para>
@ -6644,7 +6645,7 @@ Origin
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (XLogRecPtr)
</term>
<listitem>
<para>
@ -6693,7 +6694,7 @@ Relation
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -6704,11 +6705,11 @@ Relation
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (Oid)
</term>
<listitem>
<para>
ID of the relation.
OID of the relation.
</para>
</listitem>
</varlistentry>
@ -6781,11 +6782,11 @@ Relation
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (Oid)
</term>
<listitem>
<para>
ID of the column's data type.
OID of the column's data type.
</para>
</listitem>
</varlistentry>
@ -6825,7 +6826,7 @@ Type
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -6836,11 +6837,11 @@ Type
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (Oid)
</term>
<listitem>
<para>
ID of the data type.
OID of the data type.
</para>
</listitem>
</varlistentry>
@ -6890,7 +6891,7 @@ Insert
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -6901,11 +6902,11 @@ Insert
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (Oid)
</term>
<listitem>
<para>
ID of the relation corresponding to the ID in the relation
OID of the relation corresponding to the ID in the relation
message.
</para>
</listitem>
@ -6957,7 +6958,7 @@ Update
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -6968,11 +6969,11 @@ Update
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (Oid)
</term>
<listitem>
<para>
ID of the relation corresponding to the ID in the relation
OID of the relation corresponding to the ID in the relation
message.
</para>
</listitem>
@ -7071,7 +7072,7 @@ Delete
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -7082,11 +7083,11 @@ Delete
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (Oid)
</term>
<listitem>
<para>
ID of the relation corresponding to the ID in the relation
OID of the relation corresponding to the ID in the relation
message.
</para>
</listitem>
@ -7160,7 +7161,7 @@ Truncate
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -7192,11 +7193,11 @@ Truncate
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (Oid)
</term>
<listitem>
<para>
ID of the relation corresponding to the ID in the relation
OID of the relation corresponding to the ID in the relation
message. This field is repeated for each relation.
</para>
</listitem>
@ -7238,7 +7239,7 @@ Stream Start
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -7307,7 +7308,7 @@ Stream Commit
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -7317,17 +7318,17 @@ Stream Commit
</varlistentry>
<varlistentry>
<term>
Int8
Int8(0)
</term>
<listitem>
<para>
Flags; currently unused (must be 0).
Flags; currently unused.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (XLogRecPtr)
</term>
<listitem>
<para>
@ -7337,7 +7338,7 @@ Stream Commit
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (XLogRecPtr)
</term>
<listitem>
<para>
@ -7347,7 +7348,7 @@ Stream Commit
</varlistentry>
<varlistentry>
<term>
Int64
Int64 (TimestampTz)
</term>
<listitem>
<para>
@ -7382,7 +7383,7 @@ Stream Abort
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -7392,7 +7393,7 @@ Stream Abort
</varlistentry>
<varlistentry>
<term>
Int32
Int32 (TransactionId)
</term>
<listitem>
<para>
@ -7432,21 +7433,27 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (XLogRecPtr)
</term>
<listitem><para>
The LSN of the prepare.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (XLogRecPtr)
</term>
<listitem><para>
The end LSN of the prepared transaction.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (TimestampTz)
</term>
<listitem><para>
Prepare timestamp of the transaction. The value is in number
of microseconds since PostgreSQL epoch (2000-01-01).
@ -7454,7 +7461,9 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int32</term>
<term>
Int32 (TransactionId)
</term>
<listitem><para>
Xid of the transaction.
</para></listitem>
@ -7489,28 +7498,36 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int8</term>
<term>
Int8(0)
</term>
<listitem><para>
Flags; currently unused (must be 0).
Flags; currently unused.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (XLogRecPtr)
</term>
<listitem><para>
The LSN of the prepare.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (XLogRecPtr)
</term>
<listitem><para>
The end LSN of the prepared transaction.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (TimestampTz)
</term>
<listitem><para>
Prepare timestamp of the transaction. The value is in number
of microseconds since PostgreSQL epoch (2000-01-01).
@ -7518,7 +7535,9 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int32</term>
<term>
Int32 (TransactionId)
</term>
<listitem><para>
Xid of the transaction.
</para></listitem>
@ -7553,28 +7572,36 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int8</term>
<term>
Int8(0)
</term>
<listitem><para>
Flags; currently unused (must be 0).
Flags; currently unused.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (XLogRecPtr)
</term>
<listitem><para>
The LSN of the commit prepared.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (XLogRecPtr)
</term>
<listitem><para>
The end LSN of the commit prepared transaction.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (TimestampTz)
</term>
<listitem><para>
Commit timestamp of the transaction. The value is in number
of microseconds since PostgreSQL epoch (2000-01-01).
@ -7582,7 +7609,9 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int32</term>
<term>
Int32 (TransactionId)
</term>
<listitem><para>
Xid of the transaction.
</para></listitem>
@ -7617,28 +7646,36 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int8</term>
<term>
Int8(0)
</term>
<listitem><para>
Flags; currently unused (must be 0).
Flags; currently unused.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (XLogRecPtr)
</term>
<listitem><para>
The end LSN of the prepared transaction.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (XLogRecPtr)
</term>
<listitem><para>
The end LSN of the rollback prepared transaction.
</para></listitem>
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (TimestampTz)
</term>
<listitem><para>
Prepare timestamp of the transaction. The value is in number
of microseconds since PostgreSQL epoch (2000-01-01).
@ -7646,7 +7683,9 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int64</term>
<term>
Int64 (TimestampTz)
</term>
<listitem><para>
Rollback timestamp of the transaction. The value is in number
of microseconds since PostgreSQL epoch (2000-01-01).
@ -7654,7 +7693,9 @@ are available since protocol version 3.
</varlistentry>
<varlistentry>
<term>Int32</term>
<term>
Int32 (TransactionId)
</term>
<listitem><para>
Xid of the transaction.
</para></listitem>