mirror of https://github.com/citusdata/citus.git
Add failure handling for CREATE DATABASE commands
Onur Tirtir
parent
2fae91c5df
commit
a5748fc9f3
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@ -40,15 +40,38 @@
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#include "distributed/deparse_shard_query.h"
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#include "distributed/deparser.h"
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#include "distributed/listutils.h"
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#include "distributed/local_executor.h"
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#include "distributed/metadata/distobject.h"
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#include "distributed/metadata_sync.h"
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#include "distributed/metadata_utility.h"
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#include "distributed/multi_executor.h"
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#include "distributed/relation_access_tracking.h"
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#include "distributed/serialize_distributed_ddls.h"
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#include "distributed/shard_cleaner.h"
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#include "distributed/worker_protocol.h"
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#include "distributed/worker_transaction.h"
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/*
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* Used to save original name of the database before it is replaced with a
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* temporary name for failure handling purposes in PreprocessCreateDatabaseStmt().
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*/
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static char *CreateDatabaseCommandOriginalDbName = NULL;
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/*
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* The format string used when creating a temporary databases for failure
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* handling purposes.
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*
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* The fields are as follows to ensure using a unique name for each temporary
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* database:
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* - operationId: The operation id returned by RegisterOperationNeedingCleanup().
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* - groupId: The group id of the worker node where CREATE DATABASE command
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* is issued from.
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*/
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#define TEMP_DATABASE_NAME_FMT "citus_temp_database_%lu_%d"
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/*
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* DatabaseCollationInfo is used to store collation related information of a database.
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*/
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@ -453,7 +476,12 @@ PreprocessAlterDatabaseSetStmt(Node *node, const char *queryString,
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*
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* In this stage, we perform validations that we want to ensure before delegating to
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* previous utility hooks because it might not be convenient to throw an error in an
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* implicit transaction that creates a database.
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* implicit transaction that creates a database. Also in this stage, we save the original
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* database name and replace dbname field with a temporary name for failure handling
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* purposes. We let Postgres create the database with the temporary name, insert a cleanup
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* record for the temporary database name on all workers and let PostprocessCreateDatabaseStmt()
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* to return the distributed DDL job that both creates the database with the temporary name
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* and then renames it back to its original name.
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*
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* We also serialize database commands globally by acquiring a Citus specific advisory
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* lock based on OCLASS_DATABASE on the first primary worker node.
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@ -474,14 +502,41 @@ PreprocessCreateDatabaseStmt(Node *node, const char *queryString,
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SerializeDistributedDDLsOnObjectClass(OCLASS_DATABASE);
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OperationId operationId = RegisterOperationNeedingCleanup();
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char *tempDatabaseName = psprintf(TEMP_DATABASE_NAME_FMT,
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operationId, GetLocalGroupId());
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List *allNodes = TargetWorkerSetNodeList(ALL_SHARD_NODES, RowShareLock);
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WorkerNode *workerNode = NULL;
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foreach_ptr(workerNode, allNodes)
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{
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InsertCleanupRecordInSubtransaction(
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CLEANUP_OBJECT_DATABASE,
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pstrdup(quote_identifier(tempDatabaseName)),
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workerNode->groupId,
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CLEANUP_ON_FAILURE
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);
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}
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CreateDatabaseCommandOriginalDbName = stmt->dbname;
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stmt->dbname = tempDatabaseName;
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return NIL;
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}
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/*
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* PostprocessCreateDatabaseStmt is executed after the statement is applied to the local
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* postgres instance. In this stage we prepare the commands that need to be run on
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* all workers to create the database.
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* postgres instance.
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*
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* In this stage, we first rename the temporary database back to its original name for
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* local node and then return a list of distributed DDL jobs to create the database with
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* the temporary name and then to rename it back to its original name. That way, if CREATE
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* DATABASE fails on any of the nodes, the temporary database will be cleaned up by the
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* cleanup records that we inserted in PreprocessCreateDatabaseStmt() and in case of a
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* failure, we won't leak any databases called as the name that user intended to use for
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* the database.
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*
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*/
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List *
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@ -517,7 +572,51 @@ PostprocessCreateDatabaseStmt(Node *node, const char *queryString)
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*/
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List *createDatabaseDDLJobList =
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NontransactionalNodeDDLTaskList(REMOTE_NODES, createDatabaseCommands);
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return createDatabaseDDLJobList;
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CreatedbStmt *stmt = castNode(CreatedbStmt, node);
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char *renameDatabaseCommand =
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psprintf("ALTER DATABASE %s RENAME TO %s",
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quote_identifier(stmt->dbname),
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quote_identifier(CreateDatabaseCommandOriginalDbName));
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List *renameDatabaseCommands = list_make3(DISABLE_DDL_PROPAGATION,
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renameDatabaseCommand,
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ENABLE_DDL_PROPAGATION);
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/*
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* We use NodeDDLTaskList() to send the RENAME DATABASE statement to the
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* workers because we want to execute it in a coordinated transaction.
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*/
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List *renameDatabaseDDLJobList =
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NodeDDLTaskList(REMOTE_NODES, renameDatabaseCommands);
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/*
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* Temporarily disable citus.enable_ddl_propagation before issuing
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* rename command locally because we don't want to execute it on remote
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* nodes yet. We will execute it on remote nodes by returning it as a
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* distributed DDL job.
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*
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* The reason why we don't want to execute it on remote nodes yet is that
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* the database is not created on remote nodes yet.
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*/
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int saveNestLevel = NewGUCNestLevel();
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set_config_option("citus.enable_ddl_propagation", "off",
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(superuser() ? PGC_SUSET : PGC_USERSET), PGC_S_SESSION,
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GUC_ACTION_LOCAL, true, 0, false);
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ExecuteUtilityCommand(renameDatabaseCommand);
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AtEOXact_GUC(true, saveNestLevel);
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/*
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* Restore the original database name because MarkObjectDistributed()
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* resolves oid of the object based on the database name and is called
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* after executing the distributed DDL job that renames temporary database.
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*/
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stmt->dbname = CreateDatabaseCommandOriginalDbName;
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return list_concat(createDatabaseDDLJobList, renameDatabaseDDLJobList);
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}
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@ -92,6 +92,8 @@ static bool TryDropReplicationSlotOutsideTransaction(char *replicationSlotName,
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char *nodeName,
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int nodePort);
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static bool TryDropUserOutsideTransaction(char *username, char *nodeName, int nodePort);
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static bool TryDropDatabaseOutsideTransaction(char *databaseName, char *nodeName,
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int nodePort);
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static CleanupRecord * GetCleanupRecordByNameAndType(char *objectName,
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CleanupObject type);
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@ -141,7 +143,6 @@ Datum
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citus_cleanup_orphaned_resources(PG_FUNCTION_ARGS)
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{
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CheckCitusVersion(ERROR);
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EnsureCoordinator();
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PreventInTransactionBlock(true, "citus_cleanup_orphaned_resources");
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int droppedCount = DropOrphanedResourcesForCleanup();
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@ -245,12 +246,6 @@ TryDropOrphanedResources()
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static int
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DropOrphanedResourcesForCleanup()
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{
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/* Only runs on Coordinator */
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if (!IsCoordinator())
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{
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return 0;
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}
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List *cleanupRecordList = ListCleanupRecords();
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/*
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@ -603,6 +598,12 @@ TryDropResourceByCleanupRecordOutsideTransaction(CleanupRecord *record,
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return TryDropUserOutsideTransaction(record->objectName, nodeName, nodePort);
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}
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case CLEANUP_OBJECT_DATABASE:
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{
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return TryDropDatabaseOutsideTransaction(record->objectName, nodeName,
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nodePort);
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}
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default:
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{
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ereport(WARNING, (errmsg(
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@ -883,6 +884,64 @@ TryDropUserOutsideTransaction(char *username,
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}
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/*
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* TryDropDatabaseOutsideTransaction drops the database with the given name
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* if it exists.
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*/
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static bool
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TryDropDatabaseOutsideTransaction(char *databaseName, char *nodeName, int nodePort)
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{
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int connectionFlags = (OUTSIDE_TRANSACTION | FORCE_NEW_CONNECTION);
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MultiConnection *connection = GetNodeUserDatabaseConnection(connectionFlags,
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nodeName, nodePort,
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CitusExtensionOwnerName(),
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NULL);
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if (PQstatus(connection->pgConn) != CONNECTION_OK)
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{
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return false;
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}
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/*
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* We want to disable DDL propagation and set lock_timeout before issuing
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* the DROP DATABASE command but we cannot do so in a way that's scoped
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* to the DROP DATABASE command. This is because, we cannot use a
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* transaction block for the DROP DATABASE command.
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*
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* For this reason, to avoid leaking the lock_timeout and DDL propagation
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* settings to future commands, we force the connection to close at the end
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* of the transaction.
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*/
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ForceConnectionCloseAtTransactionEnd(connection);
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/*
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* The DROP DATABASE command should not propagate, so we disable DDL
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* propagation.
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*/
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List *commandList = list_make3(
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"SET lock_timeout TO '1s'",
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"SET citus.enable_ddl_propagation TO OFF;",
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psprintf("DROP DATABASE IF EXISTS %s;", quote_identifier(databaseName))
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);
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bool executeCommand = true;
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const char *commandString = NULL;
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foreach_ptr(commandString, commandList)
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{
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if (ExecuteOptionalRemoteCommand(connection, commandString, NULL) !=
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RESPONSE_OKAY)
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{
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executeCommand = false;
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break;
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}
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}
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CloseConnection(connection);
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return executeCommand;
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}
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/*
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* ErrorIfCleanupRecordForShardExists errors out if a cleanup record for the given
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* shard name exists.
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@ -41,7 +41,8 @@ typedef enum CleanupObject
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CLEANUP_OBJECT_SUBSCRIPTION = 2,
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CLEANUP_OBJECT_REPLICATION_SLOT = 3,
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CLEANUP_OBJECT_PUBLICATION = 4,
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CLEANUP_OBJECT_USER = 5
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CLEANUP_OBJECT_USER = 5,
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CLEANUP_OBJECT_DATABASE = 6
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} CleanupObject;
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/*
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@ -140,7 +140,12 @@ DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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NOTICE: issuing ALTER DATABASE regression RESET lock_timeout
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DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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set citus.enable_create_database_propagation=on;
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SET citus.next_operation_id TO 3000;
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create database "regression!'2";
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NOTICE: issuing ALTER DATABASE citus_temp_database_3000_0 RENAME TO "regression!'2"
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DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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NOTICE: issuing ALTER DATABASE citus_temp_database_3000_0 RENAME TO "regression!'2"
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DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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alter database "regression!'2" with CONNECTION LIMIT 100;
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NOTICE: issuing ALTER DATABASE "regression!'2" WITH CONNECTION LIMIT 100;
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DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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@ -189,7 +194,12 @@ alter DATABASE local_regression rename to local_regression2;
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drop database local_regression2;
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set citus.enable_create_database_propagation=on;
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drop database regression3;
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SET citus.next_operation_id TO 3100;
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create database "regression!'4";
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NOTICE: issuing ALTER DATABASE citus_temp_database_3100_0 RENAME TO "regression!'4"
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DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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NOTICE: issuing ALTER DATABASE citus_temp_database_3100_0 RENAME TO "regression!'4"
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DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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SELECT result FROM run_command_on_all_nodes(
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$$
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ALTER TABLESPACE alter_db_tablespace RENAME TO "ts-needs\!escape"
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@ -428,10 +428,11 @@ SELECT * FROM public.check_database_on_all_nodes('my_template_database') ORDER B
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set citus.enable_create_database_propagation=on;
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SET citus.log_remote_commands = true;
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set citus.grep_remote_commands = '%CREATE DATABASE%';
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SET citus.next_operation_id TO 2000;
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create database "mydatabase#1'2";
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NOTICE: issuing CREATE DATABASE "mydatabase#1'2"
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NOTICE: issuing CREATE DATABASE citus_temp_database_2000_0
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DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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NOTICE: issuing CREATE DATABASE "mydatabase#1'2"
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NOTICE: issuing CREATE DATABASE citus_temp_database_2000_0
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DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
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set citus.grep_remote_commands = '%DROP DATABASE%';
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drop database if exists "mydatabase#1'2";
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@ -1264,6 +1265,69 @@ SELECT 1 FROM run_command_on_all_nodes($$REVOKE ALL ON TABLESPACE pg_default FRO
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DROP DATABASE no_createdb;
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DROP USER no_createdb;
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-- Test a failure scenario by trying to create a distributed database that
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-- already exists on one of the nodes.
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\c - - - :worker_1_port
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CREATE DATABASE "test_\!failure";
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NOTICE: Citus partially supports CREATE DATABASE for distributed databases
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DETAIL: Citus does not propagate CREATE DATABASE command to other nodes
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HINT: You can manually create a database and its extensions on other nodes.
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\c - - - :master_port
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SET citus.enable_create_database_propagation TO ON;
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CREATE DATABASE "test_\!failure";
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ERROR: database "test_\!failure" already exists
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CONTEXT: while executing command on localhost:xxxxx
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SET client_min_messages TO WARNING;
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CALL citus_cleanup_orphaned_resources();
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RESET client_min_messages;
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SELECT result AS database_cleanedup_on_node FROM run_command_on_all_nodes($$SELECT COUNT(*)=0 FROM pg_database WHERE datname LIKE 'citus_temp_database_%'$$);
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database_cleanedup_on_node
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---------------------------------------------------------------------
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t
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t
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t
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(3 rows)
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SELECT * FROM public.check_database_on_all_nodes($$test_\!failure$$) ORDER BY node_type, result;
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node_type | result
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---------------------------------------------------------------------
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coordinator (local) | {"database_properties": null, "pg_dist_object_record_for_db_exists": false, "stale_pg_dist_object_record_for_a_db_exists": false}
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worker node (remote) | {"database_properties": null, "pg_dist_object_record_for_db_exists": false, "stale_pg_dist_object_record_for_a_db_exists": false}
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worker node (remote) | {"database_properties": {"datacl": null, "datname": "test_\\!failure", "datctype": "C", "encoding": "UTF8", "datcollate": "C", "tablespace": "pg_default", "daticurules": null, "datallowconn": true, "datconnlimit": -1, "daticulocale": null, "datistemplate": false, "database_owner": "postgres", "datcollversion": null, "datlocprovider": "c"}, "pg_dist_object_record_for_db_exists": false, "stale_pg_dist_object_record_for_a_db_exists": false}
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(3 rows)
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SET citus.enable_create_database_propagation TO OFF;
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CREATE DATABASE "test_\!failure1";
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NOTICE: Citus partially supports CREATE DATABASE for distributed databases
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DETAIL: Citus does not propagate CREATE DATABASE command to other nodes
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HINT: You can manually create a database and its extensions on other nodes.
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\c - - - :worker_1_port
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DROP DATABASE "test_\!failure";
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SET citus.enable_create_database_propagation TO ON;
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CREATE DATABASE "test_\!failure1";
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ERROR: database "test_\!failure1" already exists
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CONTEXT: while executing command on localhost:xxxxx
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SET client_min_messages TO WARNING;
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CALL citus_cleanup_orphaned_resources();
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RESET client_min_messages;
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SELECT result AS database_cleanedup_on_node FROM run_command_on_all_nodes($$SELECT COUNT(*)=0 FROM pg_database WHERE datname LIKE 'citus_temp_database_%'$$);
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database_cleanedup_on_node
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---------------------------------------------------------------------
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t
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t
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t
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(3 rows)
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SELECT * FROM public.check_database_on_all_nodes($$test_\!failure1$$) ORDER BY node_type, result;
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node_type | result
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---------------------------------------------------------------------
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coordinator (remote) | {"database_properties": {"datacl": null, "datname": "test_\\!failure1", "datctype": "C", "encoding": "UTF8", "datcollate": "C", "tablespace": "pg_default", "daticurules": null, "datallowconn": true, "datconnlimit": -1, "daticulocale": null, "datistemplate": false, "database_owner": "postgres", "datcollversion": null, "datlocprovider": "c"}, "pg_dist_object_record_for_db_exists": false, "stale_pg_dist_object_record_for_a_db_exists": false}
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worker node (local) | {"database_properties": null, "pg_dist_object_record_for_db_exists": false, "stale_pg_dist_object_record_for_a_db_exists": false}
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worker node (remote) | {"database_properties": null, "pg_dist_object_record_for_db_exists": false, "stale_pg_dist_object_record_for_a_db_exists": false}
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(3 rows)
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\c - - - :master_port
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DROP DATABASE "test_\!failure1";
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SET citus.enable_create_database_propagation TO ON;
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--clean up resources created by this test
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-- DROP TABLESPACE is not supported, so we need to drop it manually.
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@ -49,6 +49,7 @@ alter database regression set lock_timeout to DEFAULT;
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alter database regression RESET lock_timeout;
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set citus.enable_create_database_propagation=on;
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SET citus.next_operation_id TO 3000;
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create database "regression!'2";
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alter database "regression!'2" with CONNECTION LIMIT 100;
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alter database "regression!'2" with IS_TEMPLATE true CONNECTION LIMIT 50;
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@ -90,6 +91,7 @@ set citus.enable_create_database_propagation=on;
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drop database regression3;
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SET citus.next_operation_id TO 3100;
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create database "regression!'4";
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@ -219,6 +219,7 @@ SELECT * FROM public.check_database_on_all_nodes('my_template_database') ORDER B
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set citus.enable_create_database_propagation=on;
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SET citus.log_remote_commands = true;
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set citus.grep_remote_commands = '%CREATE DATABASE%';
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SET citus.next_operation_id TO 2000;
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create database "mydatabase#1'2";
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@ -746,6 +747,46 @@ SELECT 1 FROM run_command_on_all_nodes($$REVOKE ALL ON TABLESPACE pg_default FRO
|
|||
DROP DATABASE no_createdb;
|
||||
DROP USER no_createdb;
|
||||
|
||||
-- Test a failure scenario by trying to create a distributed database that
|
||||
-- already exists on one of the nodes.
|
||||
|
||||
\c - - - :worker_1_port
|
||||
CREATE DATABASE "test_\!failure";
|
||||
|
||||
\c - - - :master_port
|
||||
|
||||
SET citus.enable_create_database_propagation TO ON;
|
||||
|
||||
CREATE DATABASE "test_\!failure";
|
||||
|
||||
SET client_min_messages TO WARNING;
|
||||
CALL citus_cleanup_orphaned_resources();
|
||||
RESET client_min_messages;
|
||||
|
||||
SELECT result AS database_cleanedup_on_node FROM run_command_on_all_nodes($$SELECT COUNT(*)=0 FROM pg_database WHERE datname LIKE 'citus_temp_database_%'$$);
|
||||
SELECT * FROM public.check_database_on_all_nodes($$test_\!failure$$) ORDER BY node_type, result;
|
||||
|
||||
SET citus.enable_create_database_propagation TO OFF;
|
||||
CREATE DATABASE "test_\!failure1";
|
||||
|
||||
\c - - - :worker_1_port
|
||||
DROP DATABASE "test_\!failure";
|
||||
|
||||
SET citus.enable_create_database_propagation TO ON;
|
||||
|
||||
CREATE DATABASE "test_\!failure1";
|
||||
|
||||
SET client_min_messages TO WARNING;
|
||||
CALL citus_cleanup_orphaned_resources();
|
||||
RESET client_min_messages;
|
||||
|
||||
SELECT result AS database_cleanedup_on_node FROM run_command_on_all_nodes($$SELECT COUNT(*)=0 FROM pg_database WHERE datname LIKE 'citus_temp_database_%'$$);
|
||||
SELECT * FROM public.check_database_on_all_nodes($$test_\!failure1$$) ORDER BY node_type, result;
|
||||
|
||||
\c - - - :master_port
|
||||
|
||||
DROP DATABASE "test_\!failure1";
|
||||
|
||||
SET citus.enable_create_database_propagation TO ON;
|
||||
|
||||
--clean up resources created by this test
|
||||
|
|
|
|||
Loading…
Reference in New Issue