Make Tier-A metadata operations HA when a DataNode is down (metadata lease + self-fencing)#17831

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JackieTien97 wants to merge 17 commits into

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JackieTien97:metadata-broadcast-ha-fencing

Commits on Jun 3, 2026

Add ClusterCachePropagator to drive the Tier-A broadcast verdict
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Wire DataNodeContactTracker leadership/removal lifecycle hooks
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Wire CreateTable pre-release through ClusterCachePropagator (template)
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Add 1C3D IT: table DDL succeeds with one DataNode down
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Wire all alter/drop-table procedures through ClusterCachePropagator
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Wire tree-model schema-cache invalidation through ClusterCachePropagator
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Centralize schema-cache invalidation through ClusterCachePropagator
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Wire SET/UNSET TEMPLATE through ClusterCachePropagator
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Wire SetTTL DataNode broadcast through ClusterCachePropagator
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Wire DeleteDatabase sync cache-invalidation through ClusterCachePropagator
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Fix AuthOperationProcedure silent permission-staleness hole
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Remove internal design notes from version control
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