From: Robert Haas Date: Mon, 6 Jun 2016 18:52:58 +0000 (-0400) Subject: Stop the executor if no more tuples can be sent from worker to leader. X-Git-Tag: REL9_6_BETA2~104 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c6dbf1fe79287291bc260cbc06b0de419d2a198c;p=postgresql Stop the executor if no more tuples can be sent from worker to leader. If a Gather node has read as many tuples as it needs (for example, due to Limit) it may detach the queue connecting it to the worker before reading all of the worker's tuples. Rather than let the worker continue to generate and send all of the results, have it stop after sending the next tuple. More could be done here to stop the worker even quicker, but this is about as well as we can hope to do for 9.6. This is in response to a problem report from Andreas Seltenreich. Commit 44339b892a04e94bbb472235882dc6f7023bdc65 should be actually be sufficient to fix that example even without this change, but it seems better to do this, too, since we might otherwise waste quite a large amount of effort in one or more workers. Discussion: CAA4eK1KOKGqmz9bGu+Z42qhRwMbm4R5rfnqsLCNqFs9j14jzEA@mail.gmail.com Amit Kapila --- diff --git a/src/backend/access/common/printtup.c b/src/backend/access/common/printtup.c index 1939ff5155..d9664aa6c6 100644 --- a/src/backend/access/common/printtup.c +++ b/src/backend/access/common/printtup.c @@ -26,9 +26,9 @@ static void printtup_startup(DestReceiver *self, int operation, TupleDesc typeinfo); -static void printtup(TupleTableSlot *slot, DestReceiver *self); -static void printtup_20(TupleTableSlot *slot, DestReceiver *self); -static void printtup_internal_20(TupleTableSlot *slot, DestReceiver *self); +static bool printtup(TupleTableSlot *slot, DestReceiver *self); +static bool printtup_20(TupleTableSlot *slot, DestReceiver *self); +static bool printtup_internal_20(TupleTableSlot *slot, DestReceiver *self); static void printtup_shutdown(DestReceiver *self); static void printtup_destroy(DestReceiver *self); @@ -299,7 +299,7 @@ printtup_prepare_info(DR_printtup *myState, TupleDesc typeinfo, int numAttrs) * printtup --- print a tuple in protocol 3.0 * ---------------- */ -static void +static bool printtup(TupleTableSlot *slot, DestReceiver *self) { TupleDesc typeinfo = slot->tts_tupleDescriptor; @@ -376,13 +376,15 @@ printtup(TupleTableSlot *slot, DestReceiver *self) /* Return to caller's context, and flush row's temporary memory */ MemoryContextSwitchTo(oldcontext); MemoryContextReset(myState->tmpcontext); + + return true; } /* ---------------- * printtup_20 --- print a tuple in protocol 2.0 * ---------------- */ -static void +static bool printtup_20(TupleTableSlot *slot, DestReceiver *self) { TupleDesc typeinfo = slot->tts_tupleDescriptor; @@ -452,6 +454,8 @@ printtup_20(TupleTableSlot *slot, DestReceiver *self) /* Return to caller's context, and flush row's temporary memory */ MemoryContextSwitchTo(oldcontext); MemoryContextReset(myState->tmpcontext); + + return true; } /* ---------------- @@ -528,7 +532,7 @@ debugStartup(DestReceiver *self, int operation, TupleDesc typeinfo) * debugtup - print one tuple for an interactive backend * ---------------- */ -void +bool debugtup(TupleTableSlot *slot, DestReceiver *self) { TupleDesc typeinfo = slot->tts_tupleDescriptor; @@ -553,6 +557,8 @@ debugtup(TupleTableSlot *slot, DestReceiver *self) printatt((unsigned) i + 1, typeinfo->attrs[i], value); } printf("\t----\n"); + + return true; } /* ---------------- @@ -564,7 +570,7 @@ debugtup(TupleTableSlot *slot, DestReceiver *self) * This is largely same as printtup_20, except we use binary formatting. * ---------------- */ -static void +static bool printtup_internal_20(TupleTableSlot *slot, DestReceiver *self) { TupleDesc typeinfo = slot->tts_tupleDescriptor; @@ -636,4 +642,6 @@ printtup_internal_20(TupleTableSlot *slot, DestReceiver *self) /* Return to caller's context, and flush row's temporary memory */ MemoryContextSwitchTo(oldcontext); MemoryContextReset(myState->tmpcontext); + + return true; } diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c index 3201476c9e..28dcd34001 100644 --- a/src/backend/commands/copy.c +++ b/src/backend/commands/copy.c @@ -4454,7 +4454,7 @@ copy_dest_startup(DestReceiver *self, int operation, TupleDesc typeinfo) /* * copy_dest_receive --- receive one tuple */ -static void +static bool copy_dest_receive(TupleTableSlot *slot, DestReceiver *self) { DR_copy *myState = (DR_copy *) self; @@ -4466,6 +4466,8 @@ copy_dest_receive(TupleTableSlot *slot, DestReceiver *self) /* And send the data */ CopyOneRowTo(cstate, InvalidOid, slot->tts_values, slot->tts_isnull); myState->processed++; + + return true; } /* diff --git a/src/backend/commands/createas.c b/src/backend/commands/createas.c index cb7a145ee5..5a853c48a8 100644 --- a/src/backend/commands/createas.c +++ b/src/backend/commands/createas.c @@ -62,7 +62,7 @@ typedef struct static ObjectAddress CreateAsReladdr = {InvalidOid, InvalidOid, 0}; static void intorel_startup(DestReceiver *self, int operation, TupleDesc typeinfo); -static void intorel_receive(TupleTableSlot *slot, DestReceiver *self); +static bool intorel_receive(TupleTableSlot *slot, DestReceiver *self); static void intorel_shutdown(DestReceiver *self); static void intorel_destroy(DestReceiver *self); @@ -482,7 +482,7 @@ intorel_startup(DestReceiver *self, int operation, TupleDesc typeinfo) /* * intorel_receive --- receive one tuple */ -static void +static bool intorel_receive(TupleTableSlot *slot, DestReceiver *self) { DR_intorel *myState = (DR_intorel *) self; @@ -507,6 +507,8 @@ intorel_receive(TupleTableSlot *slot, DestReceiver *self) myState->bistate); /* We know this is a newly created relation, so there are no indexes */ + + return true; } /* diff --git a/src/backend/commands/matview.c b/src/backend/commands/matview.c index f00aab39e7..62e61a2674 100644 --- a/src/backend/commands/matview.c +++ b/src/backend/commands/matview.c @@ -56,7 +56,7 @@ typedef struct static int matview_maintenance_depth = 0; static void transientrel_startup(DestReceiver *self, int operation, TupleDesc typeinfo); -static void transientrel_receive(TupleTableSlot *slot, DestReceiver *self); +static bool transientrel_receive(TupleTableSlot *slot, DestReceiver *self); static void transientrel_shutdown(DestReceiver *self); static void transientrel_destroy(DestReceiver *self); static void refresh_matview_datafill(DestReceiver *dest, Query *query, @@ -467,7 +467,7 @@ transientrel_startup(DestReceiver *self, int operation, TupleDesc typeinfo) /* * transientrel_receive --- receive one tuple */ -static void +static bool transientrel_receive(TupleTableSlot *slot, DestReceiver *self) { DR_transientrel *myState = (DR_transientrel *) self; @@ -486,6 +486,8 @@ transientrel_receive(TupleTableSlot *slot, DestReceiver *self) myState->bistate); /* We know this is a newly created relation, so there are no indexes */ + + return true; } /* diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c index ac0230411c..b5ced388d2 100644 --- a/src/backend/executor/execMain.c +++ b/src/backend/executor/execMain.c @@ -1593,7 +1593,15 @@ ExecutePlan(EState *estate, * practice, this is probably always the case at this point.) */ if (sendTuples) - (*dest->receiveSlot) (slot, dest); + { + /* + * If we are not able to send the tuple, we assume the destination + * has closed and no more tuples can be sent. If that's the case, + * end the loop. + */ + if (!((*dest->receiveSlot) (slot, dest))) + break; + } /* * Count tuples processed, if this is a SELECT. (For other operation diff --git a/src/backend/executor/execTuples.c b/src/backend/executor/execTuples.c index 2b81f60a51..533050dc85 100644 --- a/src/backend/executor/execTuples.c +++ b/src/backend/executor/execTuples.c @@ -1266,7 +1266,7 @@ do_tup_output(TupOutputState *tstate, Datum *values, bool *isnull) ExecStoreVirtualTuple(slot); /* send the tuple to the receiver */ - (*tstate->dest->receiveSlot) (slot, tstate->dest); + (void) (*tstate->dest->receiveSlot) (slot, tstate->dest); /* clean up */ ExecClearTuple(slot); diff --git a/src/backend/executor/functions.c b/src/backend/executor/functions.c index 6e14c9d296..cd93c045dc 100644 --- a/src/backend/executor/functions.c +++ b/src/backend/executor/functions.c @@ -167,7 +167,7 @@ static Datum postquel_get_single_result(TupleTableSlot *slot, static void sql_exec_error_callback(void *arg); static void ShutdownSQLFunction(Datum arg); static void sqlfunction_startup(DestReceiver *self, int operation, TupleDesc typeinfo); -static void sqlfunction_receive(TupleTableSlot *slot, DestReceiver *self); +static bool sqlfunction_receive(TupleTableSlot *slot, DestReceiver *self); static void sqlfunction_shutdown(DestReceiver *self); static void sqlfunction_destroy(DestReceiver *self); @@ -1904,7 +1904,7 @@ sqlfunction_startup(DestReceiver *self, int operation, TupleDesc typeinfo) /* * sqlfunction_receive --- receive one tuple */ -static void +static bool sqlfunction_receive(TupleTableSlot *slot, DestReceiver *self) { DR_sqlfunction *myState = (DR_sqlfunction *) self; @@ -1914,6 +1914,8 @@ sqlfunction_receive(TupleTableSlot *slot, DestReceiver *self) /* Store the filtered tuple into the tuplestore */ tuplestore_puttupleslot(myState->tstore, slot); + + return true; } /* diff --git a/src/backend/executor/spi.c b/src/backend/executor/spi.c index 23cb6f407d..7ccabdb44b 100644 --- a/src/backend/executor/spi.c +++ b/src/backend/executor/spi.c @@ -1774,7 +1774,7 @@ spi_dest_startup(DestReceiver *self, int operation, TupleDesc typeinfo) * store tuple retrieved by Executor into SPITupleTable * of current SPI procedure */ -void +bool spi_printtup(TupleTableSlot *slot, DestReceiver *self) { SPITupleTable *tuptable; @@ -1809,6 +1809,8 @@ spi_printtup(TupleTableSlot *slot, DestReceiver *self) (tuptable->free)--; MemoryContextSwitchTo(oldcxt); + + return true; } /* diff --git a/src/backend/executor/tqueue.c b/src/backend/executor/tqueue.c index 383b5352cb..8abb1f16e4 100644 --- a/src/backend/executor/tqueue.c +++ b/src/backend/executor/tqueue.c @@ -115,12 +115,13 @@ static RemapInfo *BuildRemapInfo(TupleDesc tupledesc); * type over a range type over a range type over an array type over a record, * or something like that. */ -static void +static bool tqueueReceiveSlot(TupleTableSlot *slot, DestReceiver *self) { TQueueDestReceiver *tqueue = (TQueueDestReceiver *) self; TupleDesc tupledesc = slot->tts_tupleDescriptor; HeapTuple tuple; + shm_mq_result result; /* * Test to see whether the tupledesc has changed; if so, set up for the @@ -195,7 +196,16 @@ tqueueReceiveSlot(TupleTableSlot *slot, DestReceiver *self) } /* Send the tuple itself. */ - shm_mq_send(tqueue->handle, tuple->t_len, tuple->t_data, false); + result = shm_mq_send(tqueue->handle, tuple->t_len, tuple->t_data, false); + + if (result == SHM_MQ_DETACHED) + return false; + else if (result != SHM_MQ_SUCCESS) + ereport(ERROR, + (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), + errmsg("unable to send tuples"))); + + return true; } /* diff --git a/src/backend/executor/tstoreReceiver.c b/src/backend/executor/tstoreReceiver.c index 516440ad32..8f1e1b3f50 100644 --- a/src/backend/executor/tstoreReceiver.c +++ b/src/backend/executor/tstoreReceiver.c @@ -37,8 +37,8 @@ typedef struct } TStoreState; -static void tstoreReceiveSlot_notoast(TupleTableSlot *slot, DestReceiver *self); -static void tstoreReceiveSlot_detoast(TupleTableSlot *slot, DestReceiver *self); +static bool tstoreReceiveSlot_notoast(TupleTableSlot *slot, DestReceiver *self); +static bool tstoreReceiveSlot_detoast(TupleTableSlot *slot, DestReceiver *self); /* @@ -90,19 +90,21 @@ tstoreStartupReceiver(DestReceiver *self, int operation, TupleDesc typeinfo) * Receive a tuple from the executor and store it in the tuplestore. * This is for the easy case where we don't have to detoast. */ -static void +static bool tstoreReceiveSlot_notoast(TupleTableSlot *slot, DestReceiver *self) { TStoreState *myState = (TStoreState *) self; tuplestore_puttupleslot(myState->tstore, slot); + + return true; } /* * Receive a tuple from the executor and store it in the tuplestore. * This is for the case where we have to detoast any toasted values. */ -static void +static bool tstoreReceiveSlot_detoast(TupleTableSlot *slot, DestReceiver *self) { TStoreState *myState = (TStoreState *) self; @@ -152,6 +154,8 @@ tstoreReceiveSlot_detoast(TupleTableSlot *slot, DestReceiver *self) /* And release any temporary detoasted values */ for (i = 0; i < nfree; i++) pfree(DatumGetPointer(myState->tofree[i])); + + return true; } /* diff --git a/src/backend/tcop/dest.c b/src/backend/tcop/dest.c index 2c7dc6e526..de45cbc4fb 100644 --- a/src/backend/tcop/dest.c +++ b/src/backend/tcop/dest.c @@ -45,9 +45,10 @@ * dummy DestReceiver functions * ---------------- */ -static void +static bool donothingReceive(TupleTableSlot *slot, DestReceiver *self) { + return true; } static void diff --git a/src/backend/tcop/pquery.c b/src/backend/tcop/pquery.c index fcdc4c347c..3f6cb12b4e 100644 --- a/src/backend/tcop/pquery.c +++ b/src/backend/tcop/pquery.c @@ -1109,7 +1109,13 @@ RunFromStore(Portal portal, ScanDirection direction, uint64 count, if (!ok) break; - (*dest->receiveSlot) (slot, dest); + /* + * If we are not able to send the tuple, we assume the destination + * has closed and no more tuples can be sent. If that's the case, + * end the loop. + */ + if (!((*dest->receiveSlot) (slot, dest))) + break; ExecClearTuple(slot); diff --git a/src/include/access/printtup.h b/src/include/access/printtup.h index 64dde01cd1..608c564287 100644 --- a/src/include/access/printtup.h +++ b/src/include/access/printtup.h @@ -25,11 +25,11 @@ extern void SendRowDescriptionMessage(TupleDesc typeinfo, List *targetlist, extern void debugStartup(DestReceiver *self, int operation, TupleDesc typeinfo); -extern void debugtup(TupleTableSlot *slot, DestReceiver *self); +extern bool debugtup(TupleTableSlot *slot, DestReceiver *self); /* XXX these are really in executor/spi.c */ extern void spi_dest_startup(DestReceiver *self, int operation, TupleDesc typeinfo); -extern void spi_printtup(TupleTableSlot *slot, DestReceiver *self); +extern bool spi_printtup(TupleTableSlot *slot, DestReceiver *self); #endif /* PRINTTUP_H */ diff --git a/src/include/tcop/dest.h b/src/include/tcop/dest.h index 4e42d61c37..dd80433f74 100644 --- a/src/include/tcop/dest.h +++ b/src/include/tcop/dest.h @@ -104,7 +104,9 @@ typedef enum * pointers that the executor must call. * * Note: the receiveSlot routine must be passed a slot containing a TupleDesc - * identical to the one given to the rStartup routine. + * identical to the one given to the rStartup routine. It returns bool where + * a "true" value means "continue processing" and a "false" value means + * "stop early, just as if we'd reached the end of the scan". * ---------------- */ typedef struct _DestReceiver DestReceiver; @@ -112,7 +114,7 @@ typedef struct _DestReceiver DestReceiver; struct _DestReceiver { /* Called for each tuple to be output: */ - void (*receiveSlot) (TupleTableSlot *slot, + bool (*receiveSlot) (TupleTableSlot *slot, DestReceiver *self); /* Per-executor-run initialization and shutdown: */ void (*rStartup) (DestReceiver *self,