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9fe38b1f09
Add the design document for online shard split of namespace (multi-tenant) collections. The design covers: - Range routing over `big_endian(hash(namespace)) || namespace` with a versioned routing table derived from the collection meta. - Write switching via a `SplitShard` WAL fence message (`T_switch`) with reject-and-refetch on the proxy; target vchannels are initialized with a `BarrierTimeTick` so every message of the new WALs is strictly greater than `T_switch`. - In-place child delegators fronted by the source delegator during the transition window (sealed segments stay single-loaded, deletes and timeticks are forwarded back). - Multi-round metadata-only relabel redistribution by DataCoord, with the release-safety analysis (frozen targets, merged recovery view, register-then-release). - One-shot QueryCoord adoption with in-place delegator handoff, consistency guarantees, engineering constraints, configuration, and failure handling. issue: #50463 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: cai.zhang <cai.zhang@zilliz.com> Signed-off-by: Cai Zhang <cai.zhang@zilliz.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>