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Code Activity

Logical replication support for initial data copy

Browse Source 
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>
This commit is contained in:
Peter Eisentraut
2017-03-23 08:36:36 -04:00
parent 707576b571
commit 7c4f52409a
62 changed files with 2969 additions and 344 deletions
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39
src/backend/parser/gram.y
View File

@@ -651,7 +651,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
MAPPING MATCH MATERIALIZED MAXVALUE METHOD MINUTE_P MINVALUE MODE MONTH_P MOVE
NAME_P NAMES NATIONAL NATURAL NCHAR NEW NEXT NO NONE
NOT NOTHING NOTIFY NOTNULL NOWAIT NULL_P NULLIF
NOREFRESH NOT NOTHING NOTIFY NOTNULL NOWAIT NULL_P NULLIF
NULLS_P NUMERIC
OBJECT_P OF OFF OFFSET OIDS OLD ON ONLY OPERATOR OPTION OPTIONS OR
@@ -9095,6 +9095,7 @@ AlterSubscriptionStmt:
{
AlterSubscriptionStmt *n =
makeNode(AlterSubscriptionStmt);
n->kind = ALTER_SUBSCRIPTION_OPTIONS;
n->subname = $3;
n->options = $5;
$$ = (Node *)n;
@@ -9103,24 +9104,45 @@ AlterSubscriptionStmt:
{
AlterSubscriptionStmt *n =
makeNode(AlterSubscriptionStmt);
n->kind = ALTER_SUBSCRIPTION_CONNECTION;
n->subname = $3;
n->options = list_make1(makeDefElem("conninfo",
(Node *)makeString($5), @1));
n->conninfo = $5;
$$ = (Node *)n;
}
| ALTER SUBSCRIPTION name SET PUBLICATION publication_name_list
| ALTER SUBSCRIPTION name REFRESH PUBLICATION opt_definition
{
AlterSubscriptionStmt *n =
makeNode(AlterSubscriptionStmt);
n->kind = ALTER_SUBSCRIPTION_REFRESH;
n->subname = $3;
n->options = list_make1(makeDefElem("publication",
(Node *)$6, @1));
n->options = $6;
$$ = (Node *)n;
}
| ALTER SUBSCRIPTION name SET PUBLICATION publication_name_list REFRESH opt_definition
{
AlterSubscriptionStmt *n =
makeNode(AlterSubscriptionStmt);
n->kind = ALTER_SUBSCRIPTION_PUBLICATION_REFRESH;
n->subname = $3;
n->publication = $6;
n->options = $8;
$$ = (Node *)n;
}
| ALTER SUBSCRIPTION name SET PUBLICATION publication_name_list NOREFRESH
{
AlterSubscriptionStmt *n =
makeNode(AlterSubscriptionStmt);
n->kind = ALTER_SUBSCRIPTION_PUBLICATION;
n->subname = $3;
n->publication = $6;
n->options = NIL;
$$ = (Node *)n;
}
| ALTER SUBSCRIPTION name ENABLE_P
{
AlterSubscriptionStmt *n =
makeNode(AlterSubscriptionStmt);
n->kind = ALTER_SUBSCRIPTION_ENABLED;
n->subname = $3;
n->options = list_make1(makeDefElem("enabled",
(Node *)makeInteger(TRUE), @1));
@@ -9130,11 +9152,13 @@ AlterSubscriptionStmt:
{
AlterSubscriptionStmt *n =
makeNode(AlterSubscriptionStmt);
n->kind = ALTER_SUBSCRIPTION_ENABLED;
n->subname = $3;
n->options = list_make1(makeDefElem("enabled",
(Node *)makeInteger(FALSE), @1));
$$ = (Node *)n;
} ;
}
;
/*****************************************************************************
*
@@ -14548,6 +14572,7 @@ unreserved_keyword:
| NEW
| NEXT
| NO
| NOREFRESH
| NOTHING
| NOTIFY
| NOWAIT