mirror of https://github.com/citusdata/citus.git
291 lines
8.4 KiB
C
291 lines
8.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* master_modify_multiple_shards.c
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* UDF to run multi shard update/delete queries
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*
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* This file contains master_modify_multiple_shards function, which takes a update
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* or delete query and runs it worker shards of the distributed table. The distributed
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* modify operation can be done within a distributed transaction and committed in
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* one-phase or two-phase fashion, depending on the citus.multi_shard_commit_protocol
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* setting.
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*
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* Copyright (c) 2012-2016, Citus Data, Inc.
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "funcapi.h"
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#include "libpq-fe.h"
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#include "miscadmin.h"
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#include "catalog/pg_class.h"
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#include "commands/dbcommands.h"
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#include "commands/event_trigger.h"
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#include "distributed/citus_clauses.h"
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#include "distributed/citus_ruleutils.h"
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#include "distributed/foreign_constraint.h"
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#include "distributed/listutils.h"
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#include "distributed/master_metadata_utility.h"
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#include "distributed/master_protocol.h"
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#include "distributed/metadata_cache.h"
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#include "distributed/metadata_sync.h"
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#include "distributed/multi_client_executor.h"
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#include "distributed/multi_physical_planner.h"
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#include "distributed/multi_router_executor.h"
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#include "distributed/multi_router_planner.h"
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#include "distributed/multi_server_executor.h"
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#include "distributed/multi_shard_transaction.h"
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#include "distributed/pg_dist_shard.h"
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#include "distributed/pg_dist_partition.h"
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#include "distributed/resource_lock.h"
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#include "distributed/shardinterval_utils.h"
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#include "distributed/shard_pruning.h"
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#include "distributed/version_compat.h"
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#include "distributed/worker_protocol.h"
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#include "distributed/worker_transaction.h"
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#include "optimizer/clauses.h"
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#include "optimizer/predtest.h"
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#include "optimizer/restrictinfo.h"
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#include "optimizer/var.h"
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#include "nodes/makefuncs.h"
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#include "tcop/tcopprot.h"
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#include "utils/builtins.h"
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#include "utils/datum.h"
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#include "utils/inval.h"
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#include "utils/lsyscache.h"
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#include "utils/memutils.h"
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static List * ModifyMultipleShardsTaskList(Query *query, List *shardIntervalList, TaskType
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taskType);
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static bool ShouldExecuteTruncateStmtSequential(TruncateStmt *command);
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PG_FUNCTION_INFO_V1(master_modify_multiple_shards);
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/*
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* master_modify_multiple_shards takes in a DELETE or UPDATE query string and
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* pushes the query to shards. It finds shards that match the criteria defined
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* in the delete command, generates the same delete query string for each of the
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* found shards with distributed table name replaced with the shard name and
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* sends the queries to the workers. It uses one-phase or two-phase commit
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* transactions depending on citus.copy_transaction_manager value.
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*/
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Datum
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master_modify_multiple_shards(PG_FUNCTION_ARGS)
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{
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text *queryText = PG_GETARG_TEXT_P(0);
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char *queryString = text_to_cstring(queryText);
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List *queryTreeList = NIL;
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Oid relationId = InvalidOid;
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Index tableId = 1;
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Query *modifyQuery = NULL;
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Node *queryTreeNode;
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List *restrictClauseList = NIL;
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bool failOK = false;
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List *prunedShardIntervalList = NIL;
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List *taskList = NIL;
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int32 affectedTupleCount = 0;
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CmdType operation = CMD_UNKNOWN;
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TaskType taskType = TASK_TYPE_INVALID_FIRST;
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bool truncateOperation = false;
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#if (PG_VERSION_NUM >= 100000)
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RawStmt *rawStmt = (RawStmt *) ParseTreeRawStmt(queryString);
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queryTreeNode = rawStmt->stmt;
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#else
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queryTreeNode = ParseTreeNode(queryString);
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#endif
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CheckCitusVersion(ERROR);
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truncateOperation = IsA(queryTreeNode, TruncateStmt);
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if (!truncateOperation)
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{
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EnsureCoordinator();
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}
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if (IsA(queryTreeNode, DeleteStmt))
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{
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DeleteStmt *deleteStatement = (DeleteStmt *) queryTreeNode;
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relationId = RangeVarGetRelid(deleteStatement->relation, NoLock, failOK);
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EnsureTablePermissions(relationId, ACL_DELETE);
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}
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else if (IsA(queryTreeNode, UpdateStmt))
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{
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UpdateStmt *updateStatement = (UpdateStmt *) queryTreeNode;
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relationId = RangeVarGetRelid(updateStatement->relation, NoLock, failOK);
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EnsureTablePermissions(relationId, ACL_UPDATE);
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}
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else if (IsA(queryTreeNode, TruncateStmt))
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{
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TruncateStmt *truncateStatement = (TruncateStmt *) queryTreeNode;
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List *relationList = truncateStatement->relations;
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RangeVar *rangeVar = NULL;
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if (list_length(relationList) != 1)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("master_modify_multiple_shards() can truncate only "
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"one table")));
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}
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rangeVar = (RangeVar *) linitial(relationList);
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relationId = RangeVarGetRelid(rangeVar, NoLock, failOK);
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if (rangeVar->schemaname == NULL)
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{
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Oid schemaOid = get_rel_namespace(relationId);
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char *schemaName = get_namespace_name(schemaOid);
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rangeVar->schemaname = schemaName;
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}
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EnsureTablePermissions(relationId, ACL_TRUNCATE);
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if (ShouldExecuteTruncateStmtSequential(truncateStatement))
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{
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SetLocalMultiShardModifyModeToSequential();
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}
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}
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else
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{
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ereport(ERROR, (errmsg("query \"%s\" is not a delete, update, or truncate "
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"statement", ApplyLogRedaction(queryString))));
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}
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CheckDistributedTable(relationId);
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#if (PG_VERSION_NUM >= 100000)
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queryTreeList = pg_analyze_and_rewrite(rawStmt, queryString, NULL, 0, NULL);
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#else
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queryTreeList = pg_analyze_and_rewrite(queryTreeNode, queryString, NULL, 0);
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#endif
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modifyQuery = (Query *) linitial(queryTreeList);
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operation = modifyQuery->commandType;
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if (operation != CMD_UTILITY)
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{
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bool multiShardQuery = true;
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DeferredErrorMessage *error =
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ModifyQuerySupported(modifyQuery, modifyQuery, multiShardQuery, NULL);
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if (error)
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{
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RaiseDeferredError(error, ERROR);
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}
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taskType = MODIFY_TASK;
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}
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else
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{
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taskType = DDL_TASK;
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}
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/* reject queries with a returning list */
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if (list_length(modifyQuery->returningList) > 0)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("master_modify_multiple_shards() does not support RETURNING")));
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}
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ExecuteMasterEvaluableFunctions(modifyQuery, NULL);
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restrictClauseList = WhereClauseList(modifyQuery->jointree);
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prunedShardIntervalList =
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PruneShards(relationId, tableId, restrictClauseList, NULL);
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CHECK_FOR_INTERRUPTS();
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taskList =
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ModifyMultipleShardsTaskList(modifyQuery, prunedShardIntervalList, taskType);
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if (MultiShardConnectionType == SEQUENTIAL_CONNECTION)
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{
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affectedTupleCount =
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ExecuteModifyTasksSequentiallyWithoutResults(taskList, operation);
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}
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else
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{
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affectedTupleCount = ExecuteModifyTasksWithoutResults(taskList);
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}
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PG_RETURN_INT32(affectedTupleCount);
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}
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/*
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* ModifyMultipleShardsTaskList builds a list of tasks to execute a query on a
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* given list of shards.
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*/
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static List *
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ModifyMultipleShardsTaskList(Query *query, List *shardIntervalList, TaskType taskType)
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{
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List *taskList = NIL;
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ListCell *shardIntervalCell = NULL;
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uint64 jobId = INVALID_JOB_ID;
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int taskId = 1;
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/* lock metadata before getting placement lists */
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LockShardListMetadata(shardIntervalList, ShareLock);
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foreach(shardIntervalCell, shardIntervalList)
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{
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ShardInterval *shardInterval = (ShardInterval *) lfirst(shardIntervalCell);
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Oid relationId = shardInterval->relationId;
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uint64 shardId = shardInterval->shardId;
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StringInfo shardQueryString = makeStringInfo();
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Task *task = NULL;
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deparse_shard_query(query, relationId, shardId, shardQueryString);
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task = CitusMakeNode(Task);
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task->jobId = jobId;
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task->taskId = taskId++;
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task->taskType = taskType;
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task->queryString = shardQueryString->data;
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task->dependedTaskList = NULL;
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task->replicationModel = REPLICATION_MODEL_INVALID;
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task->anchorShardId = shardId;
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task->taskPlacementList = FinalizedShardPlacementList(shardId);
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taskList = lappend(taskList, task);
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}
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return taskList;
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}
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/*
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* ShouldExecuteTruncateStmtSequential decides if the TRUNCATE stmt needs
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* to run sequential. If so, it calls SetLocalMultiShardModifyModeToSequential().
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*
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* If a reference table which has a foreign key from a distributed table is truncated
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* we need to execute the command sequentially to avoid self-deadlock.
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*/
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static bool
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ShouldExecuteTruncateStmtSequential(TruncateStmt *command)
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{
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List *relationList = command->relations;
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ListCell *relationCell = NULL;
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bool failOK = false;
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foreach(relationCell, relationList)
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{
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RangeVar *rangeVar = (RangeVar *) lfirst(relationCell);
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Oid relationId = RangeVarGetRelid(rangeVar, NoLock, failOK);
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if (IsDistributedTable(relationId) &&
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PartitionMethod(relationId) == DISTRIBUTE_BY_NONE &&
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TableReferenced(relationId))
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{
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return true;
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}
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}
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return false;
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}
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