mirror of https://github.com/citusdata/citus.git
153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* drop_distributed_table.c
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* Routines related to dropping distributed relations from a trigger.
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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 "miscadmin.h"
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#include "distributed/commands/utility_hook.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_sync.h"
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#include "distributed/worker_transaction.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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/* local function forward declarations */
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static void MasterRemoveDistributedTableMetadataFromWorkers(Oid relationId,
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char *schemaName,
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char *tableName);
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/* exports for SQL callable functions */
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PG_FUNCTION_INFO_V1(master_drop_distributed_table_metadata);
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PG_FUNCTION_INFO_V1(master_remove_partition_metadata);
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PG_FUNCTION_INFO_V1(master_remove_distributed_table_metadata_from_workers);
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/*
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* master_drop_distributed_table_metadata UDF is a stub UDF to install Citus flawlessly.
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* Otherwise we need to delete them from our sql files, which is confusing and not a
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* common operation in the code-base.
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*
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* This function is basically replaced with
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* master_remove_distributed_table_metadata_from_workers() followed by
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* master_remove_partition_metadata().
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*/
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Datum
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master_drop_distributed_table_metadata(PG_FUNCTION_ARGS)
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{
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ereport(INFO, (errmsg("this function is deprecated and no longer is used")));
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PG_RETURN_VOID();
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}
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/*
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* master_remove_partition_metadata removes the entry of the specified distributed
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* table from pg_dist_partition.
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*/
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Datum
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master_remove_partition_metadata(PG_FUNCTION_ARGS)
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{
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Oid relationId = PG_GETARG_OID(0);
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text *schemaNameText = PG_GETARG_TEXT_P(1);
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text *tableNameText = PG_GETARG_TEXT_P(2);
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char *schemaName = text_to_cstring(schemaNameText);
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char *tableName = text_to_cstring(tableNameText);
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CheckCitusVersion(ERROR);
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/*
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* The SQL_DROP trigger calls this function even for tables that are
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* not distributed. In that case, silently ignore. This is not very
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* user-friendly, but this function is really only meant to be called
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* from the trigger.
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*/
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if (!IsDistributedTable(relationId) || !EnableDDLPropagation)
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{
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PG_RETURN_VOID();
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}
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EnsureCoordinator();
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CheckTableSchemaNameForDrop(relationId, &schemaName, &tableName);
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DeletePartitionRow(relationId);
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PG_RETURN_VOID();
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}
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/*
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* master_remove_distributed_table_metadata_from_workers removes the entry of the
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* specified distributed table from pg_dist_partition and drops the table from
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* the workers if needed.
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*/
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Datum
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master_remove_distributed_table_metadata_from_workers(PG_FUNCTION_ARGS)
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{
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Oid relationId = PG_GETARG_OID(0);
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text *schemaNameText = PG_GETARG_TEXT_P(1);
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text *tableNameText = PG_GETARG_TEXT_P(2);
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char *schemaName = text_to_cstring(schemaNameText);
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char *tableName = text_to_cstring(tableNameText);
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CheckCitusVersion(ERROR);
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CheckTableSchemaNameForDrop(relationId, &schemaName, &tableName);
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MasterRemoveDistributedTableMetadataFromWorkers(relationId, schemaName, tableName);
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PG_RETURN_VOID();
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}
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/*
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* MasterRemoveDistributedTableMetadataFromWorkers drops the table and removes
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* all the metadata belonging the distributed table in the worker nodes
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* with metadata. The function doesn't drop the tables that are
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* the shards on the workers.
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*
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* The function is a no-op for non-distributed tables and clusters that don't
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* have any workers with metadata. Also, the function errors out if called
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* from a worker node.
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*/
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static void
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MasterRemoveDistributedTableMetadataFromWorkers(Oid relationId, char *schemaName,
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char *tableName)
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{
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char *deleteDistributionCommand = NULL;
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/*
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* The SQL_DROP trigger calls this function even for tables that are
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* not distributed. In that case, silently ignore. This is not very
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* user-friendly, but this function is really only meant to be called
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* from the trigger.
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*/
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if (!IsDistributedTable(relationId) || !EnableDDLPropagation)
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{
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return;
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}
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EnsureCoordinator();
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if (!ShouldSyncTableMetadata(relationId))
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{
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return;
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}
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/* drop the distributed table metadata on the workers */
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deleteDistributionCommand = DistributionDeleteCommand(schemaName, tableName);
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SendCommandToWorkers(WORKERS_WITH_METADATA, deleteDistributionCommand);
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}
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