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Do not acquire locks on node metadata explicitly

pull/5730/head
Hanefi Onaldi 2022-02-21 22:29:00 +03:00
parent b70949ae8c
commit f4e8af2c22
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4 changed files with 0 additions and 65 deletions
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39
src/backend/distributed/commands/extension.c
View File

@ -148,16 +148,6 @@ PostprocessCreateExtensionStmt(Node *node, const char *queryString)
/* extension management can only be done via coordinator node */
EnsureCoordinator();
/*
* Make sure that no new nodes are added after this point until the end of the
* transaction by taking a RowShareLock on pg_dist_node, which conflicts with the
* ExclusiveLock taken by citus_add_node.
* This guarantees that all active nodes will have the extension, because they will
* either get it now, or get it in citus_add_node after this transaction finishes and
* the pg_dist_object record becomes visible.
*/
LockRelationOid(DistNodeRelationId(), RowShareLock);
/*
* Make sure that the current transaction is already in sequential mode,
* or can still safely be put in sequential mode
@ -259,16 +249,6 @@ PreprocessDropExtensionStmt(Node *node, const char *queryString,
/* extension management can only be done via coordinator node */
EnsureCoordinator();
/*
* Make sure that no new nodes are added after this point until the end of the
* transaction by taking a RowShareLock on pg_dist_node, which conflicts with the
* ExclusiveLock taken by citus_add_node.
* This guarantees that all active nodes will drop the extension, because they will
* either get it now, or get it in citus_add_node after this transaction finishes and
* the pg_dist_object record becomes visible.
*/
LockRelationOid(DistNodeRelationId(), RowShareLock);
/*
* Make sure that the current transaction is already in sequential mode,
* or can still safely be put in sequential mode
@ -395,15 +375,6 @@ PreprocessAlterExtensionSchemaStmt(Node *node, const char *queryString,
/* extension management can only be done via coordinator node */
EnsureCoordinator();
/*
* Make sure that no new nodes are added after this point until the end of the
* transaction by taking a RowShareLock on pg_dist_node, which conflicts with the
* ExclusiveLock taken by citus_add_node.
* This guarantees that all active nodes will update the extension schema after
* this transaction finishes and the pg_dist_object record becomes visible.
*/
LockRelationOid(DistNodeRelationId(), RowShareLock);
/*
* Make sure that the current transaction is already in sequential mode,
* or can still safely be put in sequential mode
@ -463,16 +434,6 @@ PreprocessAlterExtensionUpdateStmt(Node *node, const char *queryString,
/* extension management can only be done via coordinator node */
EnsureCoordinator();
/*
* Make sure that no new nodes are added after this point until the end of the
* transaction by taking a RowShareLock on pg_dist_node, which conflicts with the
* ExclusiveLock taken by citus_add_node.
* This guarantees that all active nodes will update the extension version, because
* they will either get it now, or get it in citus_add_node after this transaction
* finishes and the pg_dist_object record becomes visible.
*/
LockRelationOid(DistNodeRelationId(), RowShareLock);
/*
* Make sure that the current transaction is already in sequential mode,
* or can still safely be put in sequential mode

7
src/backend/distributed/commands/role.c
View File

@ -140,13 +140,6 @@ PostprocessAlterRoleStmt(Node *node, const char *queryString)
AlterRoleStmt *stmt = castNode(AlterRoleStmt, node);
/*
* Make sure that no new nodes are added after this point until the end of the
* transaction by taking a RowShareLock on pg_dist_node, which conflicts with the
* ExclusiveLock taken by citus_add_node.
*/
LockRelationOid(DistNodeRelationId(), RowShareLock);
DefElem *option = NULL;
foreach_ptr(option, stmt->options)
{

10
src/backend/distributed/commands/type.c
View File

@ -129,16 +129,6 @@ PreprocessCompositeTypeStmt(Node *node, const char *queryString,
*/
EnsureCoordinator();
/*
* Make sure that no new nodes are added after this point until the end of the
* transaction by taking a RowShareLock on pg_dist_node, which conflicts with the
* ExclusiveLock taken by citus_add_node.
* This guarantees that all active nodes will have the object, because they will
* either get it now, or get it in citus_add_node after this transaction finishes and
* the pg_dist_object record becomes visible.
*/
LockRelationOid(DistNodeRelationId(), RowShareLock);
/* fully qualify before lookup and later deparsing */
QualifyTreeNode(node);

9
src/backend/distributed/metadata/node_metadata.c
View File

@ -188,9 +188,6 @@ citus_set_coordinator_host(PG_FUNCTION_ARGS)
Name nodeClusterName = PG_GETARG_NAME(3);
nodeMetadata.nodeCluster = NameStr(*nodeClusterName);
/* prevent concurrent modification */
LockRelationOid(DistNodeRelationId(), RowShareLock);
bool isCoordinatorInMetadata = false;
WorkerNode *coordinatorNode = PrimaryNodeForGroup(COORDINATOR_GROUP_ID,
&isCoordinatorInMetadata);
@ -1780,12 +1777,6 @@ AddNodeMetadata(char *nodeName, int32 nodePort,
*nodeAlreadyExists = false;
/*
* Prevent / wait for concurrent modification before checking whether
* the worker already exists in pg_dist_node.
*/
LockRelationOid(DistNodeRelationId(), RowShareLock);
WorkerNode *workerNode = FindWorkerNodeAnyCluster(nodeName, nodePort);
if (workerNode != NULL)
{