mirror of https://github.com/citusdata/citus.git
Add CitusCopyDestReceiver infrastructure
Marco Slot
Marco Slot
parent
424745a49a
commit
bf3541cb24
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@ -68,6 +68,7 @@
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#include "distributed/remote_commands.h"
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#include "distributed/resource_lock.h"
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#include "executor/executor.h"
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#include "nodes/makefuncs.h"
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#include "tsearch/ts_locale.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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@ -127,6 +128,19 @@ static void CopySendInt16(CopyOutState outputState, int16 val);
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static void CopyAttributeOutText(CopyOutState outputState, char *string);
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static inline void CopyFlushOutput(CopyOutState outputState, char *start, char *pointer);
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/* CitusCopyDestReceiver functions */
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static void CitusCopyDestReceiverStartup(DestReceiver *copyDest, int operation,
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TupleDesc inputTupleDesc);
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#if PG_VERSION_NUM >= 90600
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static bool CitusCopyDestReceiverReceive(TupleTableSlot *slot,
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DestReceiver *copyDest);
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#else
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static void CitusCopyDestReceiverReceive(TupleTableSlot *slot,
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DestReceiver *copyDest);
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#endif
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static void CitusCopyDestReceiverShutdown(DestReceiver *destReceiver);
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static void CitusCopyDestReceiverDestroy(DestReceiver *destReceiver);
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/*
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* CitusCopyFrom implements the COPY table_name FROM. It dispacthes the copy
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@ -406,6 +420,13 @@ CopyToExistingShards(CopyStmt *copyStatement, char *completionTag)
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/* create a mapping of shard id to a connection for each of its placements */
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shardConnectionHash = CreateShardConnectionHash(TopTransactionContext);
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/*
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* From here on we use copyStatement as the template for the command
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* that we send to workers. This command does not have an attribute
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* list since NextCopyFrom will generate a value for all columns.
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*/
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copyStatement->attlist = NIL;
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/* set up callback to identify error line number */
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errorCallback.callback = CopyFromErrorCallback;
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errorCallback.arg = (void *) copyState;
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@ -604,6 +625,13 @@ CopyToNewShards(CopyStmt *copyStatement, char *completionTag, Oid relationId)
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errorCallback.arg = (void *) copyState;
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errorCallback.previous = error_context_stack;
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/*
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* From here on we use copyStatement as the template for the command
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* that we send to workers. This command does not have an attribute
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* list since NextCopyFrom will generate a value for all columns.
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*/
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copyStatement->attlist = NIL;
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while (true)
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{
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bool nextRowFound = false;
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@ -1074,22 +1102,46 @@ ConstructCopyStatement(CopyStmt *copyStatement, int64 shardId, bool useBinaryCop
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char *shardName = pstrdup(relationName);
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char *shardQualifiedName = NULL;
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const char *copyFormat = NULL;
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AppendShardIdToName(&shardName, shardId);
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shardQualifiedName = quote_qualified_identifier(schemaName, shardName);
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if (useBinaryCopyFormat)
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appendStringInfo(command, "COPY %s ", shardQualifiedName);
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if (copyStatement->attlist != NIL)
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{
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copyFormat = "BINARY";
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ListCell *columnNameCell = NULL;
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bool appendedFirstName = false;
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foreach(columnNameCell, copyStatement->attlist)
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{
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char *columnName = (char *) lfirst(columnNameCell);
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if (!appendedFirstName)
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{
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appendStringInfo(command, "(%s", columnName);
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appendedFirstName = true;
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}
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else
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{
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copyFormat = "TEXT";
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appendStringInfo(command, ", %s", columnName);
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}
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}
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appendStringInfoString(command, ") ");
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}
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appendStringInfo(command, "FROM STDIN WITH ");
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if (useBinaryCopyFormat)
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{
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appendStringInfoString(command, "(FORMAT BINARY)");
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}
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else
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{
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appendStringInfoString(command, "(FORMAT TEXT)");
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}
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appendStringInfo(command, "COPY %s FROM STDIN WITH (FORMAT %s)", shardQualifiedName,
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copyFormat);
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return command;
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}
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@ -1277,7 +1329,6 @@ AppendCopyRowData(Datum *valueArray, bool *isNullArray, TupleDesc rowDescriptor,
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{
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CopySendInt16(rowOutputState, availableColumnCount);
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}
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for (columnIndex = 0; columnIndex < totalColumnCount; columnIndex++)
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{
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Form_pg_attribute currentColumn = rowDescriptor->attrs[columnIndex];
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@ -1694,3 +1745,368 @@ CopyFlushOutput(CopyOutState cstate, char *start, char *pointer)
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CopySendData(cstate, start, pointer - start);
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}
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}
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/*
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* CreateCitusCopyDestReceiver creates a DestReceiver that copies into
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* a distributed table.
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*/
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CitusCopyDestReceiver *
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CreateCitusCopyDestReceiver(Oid tableId, List *columnNameList, EState *executorState,
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bool stopOnFailure)
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{
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CitusCopyDestReceiver *copyDest = NULL;
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copyDest = (CitusCopyDestReceiver *) palloc0(sizeof(CitusCopyDestReceiver));
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/* set up the DestReceiver function pointers */
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copyDest->pub.receiveSlot = CitusCopyDestReceiverReceive;
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copyDest->pub.rStartup = CitusCopyDestReceiverStartup;
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copyDest->pub.rShutdown = CitusCopyDestReceiverShutdown;
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copyDest->pub.rDestroy = CitusCopyDestReceiverDestroy;
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copyDest->pub.mydest = DestCopyOut;
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/* set up output parameters */
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copyDest->distributedRelationId = tableId;
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copyDest->columnNameList = columnNameList;
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copyDest->executorState = executorState;
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copyDest->stopOnFailure = stopOnFailure;
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copyDest->memoryContext = CurrentMemoryContext;
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return copyDest;
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}
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static void
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CitusCopyDestReceiverStartup(DestReceiver *dest, int operation,
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TupleDesc inputTupleDescriptor)
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{
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CitusCopyDestReceiver *copyDest = (CitusCopyDestReceiver *) dest;
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Oid tableId = copyDest->distributedRelationId;
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char *relationName = get_rel_name(tableId);
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Oid schemaOid = get_rel_namespace(tableId);
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char *schemaName = get_namespace_name(schemaOid);
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Relation distributedRelation = NULL;
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int columnIndex = 0;
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List *columnNameList = copyDest->columnNameList;
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ListCell *columnNameCell = NULL;
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char partitionMethod = '\0';
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Var *partitionColumn = NULL;
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int partitionColumnIndex = -1;
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DistTableCacheEntry *cacheEntry = NULL;
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CopyStmt *copyStatement = NULL;
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List *shardIntervalList = NULL;
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CopyOutState copyOutState = NULL;
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const char *delimiterCharacter = "\t";
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const char *nullPrintCharacter = "\\N";
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/* look up table properties */
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distributedRelation = heap_open(tableId, RowExclusiveLock);
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cacheEntry = DistributedTableCacheEntry(tableId);
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partitionMethod = cacheEntry->partitionMethod;
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copyDest->distributedRelation = distributedRelation;
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copyDest->partitionMethod = partitionMethod;
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if (partitionMethod == DISTRIBUTE_BY_NONE)
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{
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/* we don't support copy to reference tables from workers */
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EnsureSchemaNode();
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}
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else
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{
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partitionColumn = PartitionColumn(tableId, 0);
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}
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/* load the list of shards and verify that we have shards to copy into */
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shardIntervalList = LoadShardIntervalList(tableId);
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if (shardIntervalList == NIL)
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{
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if (partitionMethod == DISTRIBUTE_BY_HASH)
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{
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ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("could not find any shards into which to copy"),
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errdetail("No shards exist for distributed table \"%s\".",
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relationName),
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errhint("Run master_create_worker_shards to create shards "
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"and try again.")));
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}
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else
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{
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ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("could not find any shards into which to copy"),
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errdetail("No shards exist for distributed table \"%s\".",
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relationName)));
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}
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}
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/* prevent concurrent placement changes and non-commutative DML statements */
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LockShardListMetadata(shardIntervalList, ShareLock);
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LockShardListResources(shardIntervalList, ShareLock);
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/* error if any shard missing min/max values */
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if (partitionMethod != DISTRIBUTE_BY_NONE &&
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cacheEntry->hasUninitializedShardInterval)
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{
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ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("could not start copy"),
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errdetail("Distributed relation \"%s\" has shards "
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"with missing shardminvalue/shardmaxvalue.",
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relationName)));
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}
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copyDest->hashFunction = cacheEntry->hashFunction;
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copyDest->compareFunction = cacheEntry->shardIntervalCompareFunction;
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/* initialize the shard interval cache */
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copyDest->shardCount = cacheEntry->shardIntervalArrayLength;
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copyDest->shardIntervalCache = cacheEntry->sortedShardIntervalArray;
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/* determine whether to use binary search */
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if (partitionMethod != DISTRIBUTE_BY_HASH || !cacheEntry->hasUniformHashDistribution)
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{
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copyDest->useBinarySearch = true;
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}
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/* define how tuples will be serialised */
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copyOutState = (CopyOutState) palloc0(sizeof(CopyOutStateData));
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copyOutState->delim = (char *) delimiterCharacter;
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copyOutState->null_print = (char *) nullPrintCharacter;
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copyOutState->null_print_client = (char *) nullPrintCharacter;
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copyOutState->binary = CanUseBinaryCopyFormat(inputTupleDescriptor, copyOutState);
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copyOutState->fe_msgbuf = makeStringInfo();
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copyOutState->rowcontext = GetPerTupleMemoryContext(copyDest->executorState);
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copyDest->copyOutState = copyOutState;
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copyDest->tupleDescriptor = inputTupleDescriptor;
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/* prepare output functions */
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copyDest->columnOutputFunctions =
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ColumnOutputFunctions(inputTupleDescriptor, copyOutState->binary);
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foreach(columnNameCell, columnNameList)
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{
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char *columnName = (char *) lfirst(columnNameCell);
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/* load the column information from pg_attribute */
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AttrNumber attrNumber = get_attnum(tableId, columnName);
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/* check whether this is the partition column */
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if (partitionColumn != NULL && attrNumber == partitionColumn->varattno)
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{
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Assert(partitionColumnIndex == -1);
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partitionColumnIndex = columnIndex;
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}
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columnIndex++;
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}
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if (partitionMethod != DISTRIBUTE_BY_NONE && partitionColumnIndex == -1)
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{
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ereport(ERROR, (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
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errmsg("the partition column of table %s should have a value",
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quote_qualified_identifier(schemaName, relationName))));
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}
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copyDest->partitionColumnIndex = partitionColumnIndex;
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/* define the template for the COPY statement that is sent to workers */
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copyStatement = makeNode(CopyStmt);
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copyStatement->relation = makeRangeVar(schemaName, relationName, -1);
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copyStatement->query = NULL;
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copyStatement->attlist = columnNameList;
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copyStatement->is_from = true;
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copyStatement->is_program = false;
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copyStatement->filename = NULL;
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copyStatement->options = NIL;
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copyDest->copyStatement = copyStatement;
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copyDest->copyConnectionHash = CreateShardConnectionHash(TopTransactionContext);
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}
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#if PG_VERSION_NUM >= 90600
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static bool
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#else
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static void
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#endif
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CitusCopyDestReceiverReceive(TupleTableSlot *slot, DestReceiver *dest)
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{
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CitusCopyDestReceiver *copyDest = (CitusCopyDestReceiver *) dest;
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char partitionMethod = copyDest->partitionMethod;
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int partitionColumnIndex = copyDest->partitionColumnIndex;
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TupleDesc tupleDescriptor = copyDest->tupleDescriptor;
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CopyStmt *copyStatement = copyDest->copyStatement;
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int shardCount = copyDest->shardCount;
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ShardInterval **shardIntervalCache = copyDest->shardIntervalCache;
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bool useBinarySearch = copyDest->useBinarySearch;
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FmgrInfo *hashFunction = copyDest->hashFunction;
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FmgrInfo *compareFunction = copyDest->compareFunction;
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HTAB *copyConnectionHash = copyDest->copyConnectionHash;
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CopyOutState copyOutState = copyDest->copyOutState;
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FmgrInfo *columnOutputFunctions = copyDest->columnOutputFunctions;
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bool stopOnFailure = copyDest->stopOnFailure;
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Datum *columnValues = NULL;
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bool *columnNulls = NULL;
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Datum partitionColumnValue = 0;
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ShardInterval *shardInterval = NULL;
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int64 shardId = 0;
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bool shardConnectionsFound = false;
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ShardConnections *shardConnections = NULL;
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EState *executorState = copyDest->executorState;
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MemoryContext executorTupleContext = GetPerTupleMemoryContext(executorState);
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MemoryContext oldContext = MemoryContextSwitchTo(executorTupleContext);
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slot_getallattrs(slot);
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columnValues = slot->tts_values;
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columnNulls = slot->tts_isnull;
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/*
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* Find the partition column value and corresponding shard interval
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* for non-reference tables.
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* Get the existing (and only a single) shard interval for the reference
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* tables. Note that, reference tables has NULL partition column values so
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* skip the check.
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*/
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if (partitionColumnIndex >= 0)
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{
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if (columnNulls[partitionColumnIndex])
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{
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Oid relationId = copyDest->distributedRelationId;
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char *relationName = get_rel_name(relationId);
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Oid schemaOid = get_rel_namespace(relationId);
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char *schemaName = get_namespace_name(schemaOid);
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char *qualifiedTableName = quote_qualified_identifier(schemaName,
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relationName);
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ereport(ERROR, (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
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errmsg("the partition column of table %s should have a value",
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qualifiedTableName)));
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}
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/* find the partition column value */
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partitionColumnValue = columnValues[partitionColumnIndex];
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}
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/*
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* Find the shard interval and id for the partition column value for
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* non-reference tables.
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*
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* For reference table, this function blindly returns the tables single
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* shard.
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*/
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shardInterval = FindShardInterval(partitionColumnValue, shardIntervalCache,
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shardCount, partitionMethod,
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compareFunction, hashFunction,
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useBinarySearch);
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if (shardInterval == NULL)
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{
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ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("could not find shard for partition column "
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"value")));
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}
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shardId = shardInterval->shardId;
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/* connections hash is kept in memory context */
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MemoryContextSwitchTo(copyDest->memoryContext);
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/* get existing connections to the shard placements, if any */
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shardConnections = GetShardHashConnections(copyConnectionHash, shardId,
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&shardConnectionsFound);
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if (!shardConnectionsFound)
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{
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/* open connections and initiate COPY on shard placements */
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OpenCopyConnections(copyStatement, shardConnections, stopOnFailure,
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copyOutState->binary);
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/* send copy binary headers to shard placements */
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if (copyOutState->binary)
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{
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SendCopyBinaryHeaders(copyOutState, shardId,
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shardConnections->connectionList);
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}
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}
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/* replicate row to shard placements */
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resetStringInfo(copyOutState->fe_msgbuf);
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AppendCopyRowData(columnValues, columnNulls, tupleDescriptor,
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copyOutState, columnOutputFunctions);
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SendCopyDataToAll(copyOutState->fe_msgbuf, shardId, shardConnections->connectionList);
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MemoryContextSwitchTo(oldContext);
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#if PG_VERSION_NUM >= 90600
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return true;
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#endif
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}
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static void
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CitusCopyDestReceiverShutdown(DestReceiver *destReceiver)
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{
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CitusCopyDestReceiver *copyDest = (CitusCopyDestReceiver *) destReceiver;
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HTAB *shardConnectionHash = copyDest->copyConnectionHash;
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List *shardConnectionsList = NIL;
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ListCell *shardConnectionsCell = NULL;
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CopyOutState copyOutState = copyDest->copyOutState;
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Relation distributedRelation = copyDest->distributedRelation;
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shardConnectionsList = ShardConnectionList(shardConnectionHash);
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foreach(shardConnectionsCell, shardConnectionsList)
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{
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ShardConnections *shardConnections = (ShardConnections *) lfirst(
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shardConnectionsCell);
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/* send copy binary footers to all shard placements */
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if (copyOutState->binary)
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{
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SendCopyBinaryFooters(copyOutState, shardConnections->shardId,
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shardConnections->connectionList);
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}
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/* close the COPY input on all shard placements */
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EndRemoteCopy(shardConnections->shardId, shardConnections->connectionList, true);
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}
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heap_close(distributedRelation, NoLock);
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}
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static void
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CitusCopyDestReceiverDestroy(DestReceiver *destReceiver)
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{
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CitusCopyDestReceiver *copyDest = (CitusCopyDestReceiver *) destReceiver;
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if (copyDest->copyOutState)
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{
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pfree(copyDest->copyOutState);
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}
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if (copyDest->columnOutputFunctions)
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{
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pfree(copyDest->columnOutputFunctions);
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}
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pfree(copyDest);
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}
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@ -13,7 +13,11 @@
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#define MULTI_COPY_H
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||||
#include "distributed/master_metadata_utility.h"
|
||||
#include "nodes/execnodes.h"
|
||||
#include "nodes/parsenodes.h"
|
||||
#include "tcop/dest.h"
|
||||
|
||||
|
||||
/*
|
||||
* A smaller version of copy.c's CopyStateData, trimmed to the elements
|
||||
|
|
@ -43,8 +47,54 @@ typedef struct NodeAddress
|
|||
int32 nodePort;
|
||||
} NodeAddress;
|
||||
|
||||
/* CopyDestReceiver can be used to stream results into a distributed table */
|
||||
typedef struct CitusCopyDestReceiver
|
||||
{
|
||||
DestReceiver pub;
|
||||
|
||||
/* relation and columns to which to copy */
|
||||
Oid distributedRelationId;
|
||||
List *columnNameList;
|
||||
|
||||
/* EState for per-tuple memory allocation */
|
||||
EState *executorState;
|
||||
|
||||
/* MemoryContext for DestReceiver session */
|
||||
MemoryContext memoryContext;
|
||||
|
||||
/* distributed relation details */
|
||||
Relation distributedRelation;
|
||||
char partitionMethod;
|
||||
int partitionColumnIndex;
|
||||
|
||||
/* descriptor of the tuples that are sent to the worker */
|
||||
TupleDesc tupleDescriptor;
|
||||
|
||||
/* template for COPY statement to send to workers */
|
||||
CopyStmt *copyStatement;
|
||||
|
||||
/* cached shard metadata for pruning */
|
||||
int shardCount;
|
||||
ShardInterval **shardIntervalCache;
|
||||
bool useBinarySearch;
|
||||
FmgrInfo *hashFunction;
|
||||
FmgrInfo *compareFunction;
|
||||
|
||||
/* cached shard metadata for pruning */
|
||||
HTAB *copyConnectionHash;
|
||||
bool stopOnFailure;
|
||||
|
||||
/* state on how to copy out data types */
|
||||
CopyOutState copyOutState;
|
||||
FmgrInfo *columnOutputFunctions;
|
||||
} CitusCopyDestReceiver;
|
||||
|
||||
|
||||
/* function declarations for copying into a distributed table */
|
||||
extern CitusCopyDestReceiver * CreateCitusCopyDestReceiver(Oid relationId,
|
||||
List *columnNameList,
|
||||
EState *executorState,
|
||||
bool stopOnFailure);
|
||||
extern FmgrInfo * ColumnOutputFunctions(TupleDesc rowDescriptor, bool binaryFormat);
|
||||
extern void AppendCopyRowData(Datum *valueArray, bool *isNullArray,
|
||||
TupleDesc rowDescriptor,
|
||||
|
|
|
|||
Loading…
Reference in New Issue