Generic Configuration Updater (GCU) performance enhancements#3831

Merged

lguohan merged 17 commits intosonic-net:masterfrom

bhouse-nexthop:bhouse-nexthop/gcu-perf

Nov 3, 2025

Commits on Jul 7, 2025

optimization: prevent unneeded deep copies that show up in profiling
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sy.loadData() implicitly does a validation already, no need to re-do it

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move configdb path<>xpath conversion to sonic-yang-mgmt
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functions to sort table keys by backlinks and musts
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move generators: Use new key sorting
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JsonMoveGroup: new toplevel output for move generators
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optimization: avoid reloading configuration as much as possible
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add BulkLowLevelMoveGenerator()
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JsonMove: implement basic undo support

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add BulkKeyLevelMoveGenerator()
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ChangeApplier: no need to re-read configdb twice per patch
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Remove invalid test cases
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config_db updates: work around race condition

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BulkKeyGroupLowLevelMoveGenerator: Group updates across keys for the same table

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BulkKeyGroupLowLevelMoveGenerator: optimize for restricted keys

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fix lint whitespace issues

bhouse-nexthop
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fix test cases due to removal of import in change_applier

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bradh352
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