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!4045 【资源池化】优化cm_agent获取快照逻辑，不走dms，减少cm_agent获取状态异常的场景

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Merge pull request !4045 from cchen676/0809master_1
This commit is contained in:
opengauss_bot
2023-08-31 07:27:51 +00:00
committed by Gitee
parent dcd30419b3 b17e58e756
commit 0ee492338e
1 changed files with 6 additions and 0 deletions
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6
src/gausskernel/ddes/adapter/ss_transaction.cpp
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@ -99,6 +99,12 @@ Snapshot SSGetSnapshotData(Snapshot snapshot)
return NULL; return NULL;
} }
/* For cm agent, it only query the system status using the parameter in memory. So don't need MVCC */
if (u_sess->libpq_cxt.IsConnFromCmAgent) {
snapshot = SnapshotNow;
return snapshot;
}
if (!ENABLE_SS_BCAST_SNAPSHOT || if (!ENABLE_SS_BCAST_SNAPSHOT ||
(g_instance.dms_cxt.latest_snapshot_xmax == InvalidTransactionId && (g_instance.dms_cxt.latest_snapshot_xmax == InvalidTransactionId &&
t_thrd.dms_cxt.latest_snapshot_xmax == InvalidTransactionId)) { t_thrd.dms_cxt.latest_snapshot_xmax == InvalidTransactionId)) {