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Introduce replication slots.

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Replication slots are a crash-safe data structure which can be created
on either a master or a standby to prevent premature removal of
write-ahead log segments needed by a standby, as well as (with
hot_standby_feedback=on) pruning of tuples whose removal would cause
replication conflicts.  Slots have some advantages over existing
techniques, as explained in the documentation.

In a few places, we refer to the type of replication slots introduced
by this patch as "physical" slots, because forthcoming patches for
logical decoding will also have slots, but with somewhat different
properties.

Andres Freund and Robert Haas
This commit is contained in:
Robert Haas
2014-01-31 22:45:17 -05:00
parent 5bdef38b89
commit 858ec11858
42 changed files with 2356 additions and 62 deletions
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54
src/backend/replication/repl_gram.y
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@@ -65,7 +65,7 @@ Node *replication_parse_result;
}
/* Non-keyword tokens */
%token <str> SCONST
%token <str> SCONST IDENT
%token <uintval> UCONST
%token <recptr> RECPTR
@@ -73,6 +73,8 @@ Node *replication_parse_result;
%token K_BASE_BACKUP
%token K_IDENTIFY_SYSTEM
%token K_START_REPLICATION
%token K_CREATE_REPLICATION_SLOT
%token K_DROP_REPLICATION_SLOT
%token K_TIMELINE_HISTORY
%token K_LABEL
%token K_PROGRESS
@@ -80,12 +82,15 @@ Node *replication_parse_result;
%token K_NOWAIT
%token K_WAL
%token K_TIMELINE
%token K_PHYSICAL
%token K_SLOT
%type <node> command
%type <node> base_backup start_replication identify_system timeline_history
%type <node> base_backup start_replication create_replication_slot drop_replication_slot identify_system timeline_history
%type <list> base_backup_opt_list
%type <defelt> base_backup_opt
%type <uintval> opt_timeline
%type <str> opt_slot
%%
firstcmd: command opt_semicolon
@@ -102,6 +107,8 @@ command:
identify_system
| base_backup
| start_replication
| create_replication_slot
| drop_replication_slot
| timeline_history
;
@@ -158,18 +165,42 @@ base_backup_opt:
}
;
/* CREATE_REPLICATION_SLOT SLOT slot PHYSICAL */
create_replication_slot:
K_CREATE_REPLICATION_SLOT IDENT K_PHYSICAL
{
CreateReplicationSlotCmd *cmd;
cmd = makeNode(CreateReplicationSlotCmd);
cmd->kind = REPLICATION_KIND_PHYSICAL;
cmd->slotname = $2;
$$ = (Node *) cmd;
}
;
/* DROP_REPLICATION_SLOT SLOT slot */
drop_replication_slot:
K_DROP_REPLICATION_SLOT IDENT
{
DropReplicationSlotCmd *cmd;
cmd = makeNode(DropReplicationSlotCmd);
cmd->slotname = $2;
$$ = (Node *) cmd;
}
;
/*
* START_REPLICATION %X/%X [TIMELINE %d]
* START_REPLICATION [SLOT slot] [PHYSICAL] %X/%X [TIMELINE %d]
*/
start_replication:
K_START_REPLICATION RECPTR opt_timeline
K_START_REPLICATION opt_slot opt_physical RECPTR opt_timeline
{
StartReplicationCmd *cmd;
cmd = makeNode(StartReplicationCmd);
cmd->startpoint = $2;
cmd->timeline = $3;
cmd->kind = REPLICATION_KIND_PHYSICAL;
cmd->slotname = $2;
cmd->startpoint = $4;
cmd->timeline = $5;
$$ = (Node *) cmd;
}
;
@@ -205,6 +236,15 @@ timeline_history:
$$ = (Node *) cmd;
}
;
opt_physical : K_PHYSICAL | /* EMPTY */;
opt_slot : K_SLOT IDENT
{
$$ = $2;
}
| /* nothing */ { $$ = NULL; }
%%
#include "repl_scanner.c"