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gfphoenix78 pushed a commit to branch sync-with-upstream
in repository https://gitbox.apache.org/repos/asf/cloudberry-gpbackup.git
The following commit(s) were added to refs/heads/sync-with-upstream by this
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new 2bc6f7aa fix(backup): Use standard LOCK TABLE syntax for Cloudberry
(#28)
2bc6f7aa is described below
commit 2bc6f7aadb71435e0fe61ad973ad3dcca54b9bb3
Author: Robert Mu <[email protected]>
AuthorDate: Thu Aug 28 20:40:09 2025 +0800
fix(backup): Use standard LOCK TABLE syntax for Cloudberry (#28)
Temporarily modifies the table locking logic to use a standard
`LOCK TABLE ... IN ACCESS SHARE MODE` command when running against
Cloudberry.
This change is necessary because Cloudberry, which is based on
PostgreSQL 14, does not support the `COORDINATOR ONLY` clause that was
introduced in GPDB 7 as a performance optimization. The use of this
unsupported syntax was causing `gpbackup` to panic during the initial
table locking phase.
A TODO comment has been added to both modified functions (`LockTables`
and `LockTableNoWait`) to indicate that this is a workaround. The logic
should be reverted to use the `COORDINATOR ONLY` optimization once
Cloudberry implements this feature for feature and performance parity
with GPDB 7.
See https://github.com/apache/cloudberry/issues/1265
---
backup/data.go | 8 +++++++-
backup/queries_relations.go | 8 +++++++-
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/backup/data.go b/backup/data.go
index be6d9ba2..bcd4c786 100644
--- a/backup/data.go
+++ b/backup/data.go
@@ -371,7 +371,13 @@ func GetBackupDataSet(tables []Table) ([]Table, int64) {
// the lock, the call will fail instead of block. Return the failure for
handling.
func LockTableNoWait(dataTable Table, connNum int) error {
var lockMode string
- if (connectionPool.Version.IsGPDB() &&
connectionPool.Version.AtLeast("7")) || connectionPool.Version.IsCBDB() {
+ // TODO: This is a temporary workaround. Cloudberry should support the
+ // COORDINATOR ONLY syntax to align with GPDB 7+ for performance
optimization
+ // during the table locking phase. Revert this to the combined GPDB 7+
condition
+ // once Cloudberry adds this feature.
+ if connectionPool.Version.IsCBDB() {
+ lockMode = `IN ACCESS SHARE MODE NOWAIT`
+ } else if connectionPool.Version.IsGPDB() &&
connectionPool.Version.AtLeast("7") {
lockMode = `IN ACCESS SHARE MODE NOWAIT COORDINATOR ONLY`
} else if connectionPool.Version.AtLeast("6.21.0") {
lockMode = `IN ACCESS SHARE MODE NOWAIT MASTER ONLY`
diff --git a/backup/queries_relations.go b/backup/queries_relations.go
index 0b1e37cc..b7a1474e 100644
--- a/backup/queries_relations.go
+++ b/backup/queries_relations.go
@@ -486,7 +486,13 @@ func LockTables(connectionPool *dbconn.DBConn, tables
[]Relation) {
lastBatchSize := len(tables) % batchSize
tableBatches := GenerateTableBatches(tables, batchSize)
currentBatchSize := batchSize
- if (connectionPool.Version.IsGPDB() &&
connectionPool.Version.AtLeast("7")) || connectionPool.Version.IsCBDB() {
+ // TODO: This is a temporary workaround. Cloudberry should support the
+ // COORDINATOR ONLY syntax to align with GPDB 7+ for performance
optimization
+ // during the table locking phase. Revert this to the combined GPDB 7+
condition
+ // once Cloudberry adds this feature.
+ if connectionPool.Version.IsCBDB() {
+ lockMode = `IN ACCESS SHARE MODE`
+ } else if connectionPool.Version.IsGPDB() &&
connectionPool.Version.AtLeast("7") {
lockMode = `IN ACCESS SHARE MODE COORDINATOR ONLY`
} else if connectionPool.Version.IsGPDB() &&
connectionPool.Version.AtLeast("6.21.0") {
lockMode = `IN ACCESS SHARE MODE MASTER ONLY`
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