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Create an infrastructure for parallel computation in PostgreSQL.

Browse Source 
This does four basic things.  First, it provides convenience routines
to coordinate the startup and shutdown of parallel workers.  Second,
it synchronizes various pieces of state (e.g. GUCs, combo CID
mappings, transaction snapshot) from the parallel group leader to the
worker processes.  Third, it prohibits various operations that would
result in unsafe changes to that state while parallelism is active.
Finally, it propagates events that would result in an ErrorResponse,
NoticeResponse, or NotifyResponse message being sent to the client
from the parallel workers back to the master, from which they can then
be sent on to the client.

Robert Haas, Amit Kapila, Noah Misch, Rushabh Lathia, Jeevan Chalke.
Suggestions and review from Andres Freund, Heikki Linnakangas, Noah
Misch, Simon Riggs, Euler Taveira, and Jim Nasby.
This commit is contained in:
Robert Haas
2015-04-30 15:02:14 -04:00
parent 669c7d20e6
commit 924bcf4f16
37 changed files with 2499 additions and 47 deletions
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30
src/backend/utils/adt/lockfuncs.c
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@ -13,6 +13,7 @@
#include "postgres.h"
#include "access/htup_details.h"
#include "access/xact.h"
#include "catalog/pg_type.h"
#include "funcapi.h"
#include "miscadmin.h"
@ -411,6 +412,15 @@ pg_lock_status(PG_FUNCTION_ARGS)
#define SET_LOCKTAG_INT32(tag, key1, key2) \
SET_LOCKTAG_ADVISORY(tag, MyDatabaseId, key1, key2, 2)
static void
PreventAdvisoryLocksInParallelMode(void)
{
if (IsInParallelMode())
ereport(ERROR,
(errcode(ERRCODE_INVALID_TRANSACTION_STATE),
errmsg("cannot use advisory locks during a parallel operation")));
}
/*
* pg_advisory_lock(int8) - acquire exclusive lock on an int8 key
*/
@ -420,6 +430,7 @@ pg_advisory_lock_int8(PG_FUNCTION_ARGS)
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
(void) LockAcquire(&tag, ExclusiveLock, true, false);
@ -437,6 +448,7 @@ pg_advisory_xact_lock_int8(PG_FUNCTION_ARGS)
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
(void) LockAcquire(&tag, ExclusiveLock, false, false);
@ -453,6 +465,7 @@ pg_advisory_lock_shared_int8(PG_FUNCTION_ARGS)
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
(void) LockAcquire(&tag, ShareLock, true, false);
@ -470,6 +483,7 @@ pg_advisory_xact_lock_shared_int8(PG_FUNCTION_ARGS)
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
(void) LockAcquire(&tag, ShareLock, false, false);
@ -489,6 +503,7 @@ pg_try_advisory_lock_int8(PG_FUNCTION_ARGS)
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
res = LockAcquire(&tag, ExclusiveLock, true, true);
@ -509,6 +524,7 @@ pg_try_advisory_xact_lock_int8(PG_FUNCTION_ARGS)
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
res = LockAcquire(&tag, ExclusiveLock, false, true);
@ -528,6 +544,7 @@ pg_try_advisory_lock_shared_int8(PG_FUNCTION_ARGS)
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
res = LockAcquire(&tag, ShareLock, true, true);
@ -548,6 +565,7 @@ pg_try_advisory_xact_lock_shared_int8(PG_FUNCTION_ARGS)
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
res = LockAcquire(&tag, ShareLock, false, true);
@ -567,6 +585,7 @@ pg_advisory_unlock_int8(PG_FUNCTION_ARGS)
LOCKTAG tag;
bool res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
res = LockRelease(&tag, ExclusiveLock, true);
@ -586,6 +605,7 @@ pg_advisory_unlock_shared_int8(PG_FUNCTION_ARGS)
LOCKTAG tag;
bool res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
res = LockRelease(&tag, ShareLock, true);
@ -603,6 +623,7 @@ pg_advisory_lock_int4(PG_FUNCTION_ARGS)
int32 key2 = PG_GETARG_INT32(1);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
(void) LockAcquire(&tag, ExclusiveLock, true, false);
@ -621,6 +642,7 @@ pg_advisory_xact_lock_int4(PG_FUNCTION_ARGS)
int32 key2 = PG_GETARG_INT32(1);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
(void) LockAcquire(&tag, ExclusiveLock, false, false);
@ -638,6 +660,7 @@ pg_advisory_lock_shared_int4(PG_FUNCTION_ARGS)
int32 key2 = PG_GETARG_INT32(1);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
(void) LockAcquire(&tag, ShareLock, true, false);
@ -656,6 +679,7 @@ pg_advisory_xact_lock_shared_int4(PG_FUNCTION_ARGS)
int32 key2 = PG_GETARG_INT32(1);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
(void) LockAcquire(&tag, ShareLock, false, false);
@ -676,6 +700,7 @@ pg_try_advisory_lock_int4(PG_FUNCTION_ARGS)
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
res = LockAcquire(&tag, ExclusiveLock, true, true);
@ -697,6 +722,7 @@ pg_try_advisory_xact_lock_int4(PG_FUNCTION_ARGS)
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
res = LockAcquire(&tag, ExclusiveLock, false, true);
@ -717,6 +743,7 @@ pg_try_advisory_lock_shared_int4(PG_FUNCTION_ARGS)
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
res = LockAcquire(&tag, ShareLock, true, true);
@ -738,6 +765,7 @@ pg_try_advisory_xact_lock_shared_int4(PG_FUNCTION_ARGS)
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
res = LockAcquire(&tag, ShareLock, false, true);
@ -758,6 +786,7 @@ pg_advisory_unlock_int4(PG_FUNCTION_ARGS)
LOCKTAG tag;
bool res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
res = LockRelease(&tag, ExclusiveLock, true);
@ -778,6 +807,7 @@ pg_advisory_unlock_shared_int4(PG_FUNCTION_ARGS)
LOCKTAG tag;
bool res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT32(tag, key1, key2);
res = LockRelease(&tag, ShareLock, true);