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pingqiuandClaude Opus 4.6
c9671c4e47
Live catch-up chain: - Assignment → engine plan → v2bridge WAL scan → blockvol ScanFrom - StreamWALEntries transfers real entries (transferred=5) - V1 interim: engine classifies ZeroGap (committed=0), but WAL scan chain proven mechanically (executor→v2bridge→blockvol→progress) Live rebuild chain (full-base): - ForceFlush advances checkpoint → NeedsRebuild detected - TransferFullBase now real: validates extent accessible at committed LSN - Engine rebuild session: connect → handshake → source select → transfer → complete → InSync Execution cleanup: - CancelPlan releases resources + invalidates session - Log shows plan_cancelled with reason Observability: - sender_added + escalated events explain execution causality - Escalation includes proof reason from RetainedHistory 4 new execution chain tests + TransferFullBase implementation. Carry-forward: - Post-checkpoint catch-up not proven as integrated engine chain (V1 CommittedLSN=0 collapses to ZeroGap) - TransferSnapshot: stub - TruncateWAL: stub Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
76 lines
2.5 KiB
Go
76 lines
2.5 KiB
Go
package v2bridge
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import (
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/storage/blockvol"
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)
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// Executor performs real recovery I/O using blockvol internals.
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// It executes what the engine tells it to do — it does NOT decide
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// recovery policy.
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//
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// Phase 07 P1: one narrow path (WAL catch-up streaming).
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// Full-base rebuild and snapshot transfer are deferred.
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type Executor struct {
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vol *blockvol.BlockVol
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}
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// NewExecutor creates an executor for a real blockvol instance.
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func NewExecutor(vol *blockvol.BlockVol) *Executor {
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return &Executor{vol: vol}
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}
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// StreamWALEntries reads WAL entries from startExclusive+1 to endInclusive
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// using BlockVol.ScanWALEntries (real ScanFrom mechanism).
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// Returns the highest LSN successfully scanned.
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//
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// This is the real catch-up data path. The callback receives each entry
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// for shipping to the replica (network-layer apply is the caller's job).
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func (e *Executor) StreamWALEntries(startExclusive, endInclusive uint64) (uint64, error) {
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if e.vol == nil {
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return 0, fmt.Errorf("no blockvol instance")
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}
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var highestLSN uint64
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err := e.vol.ScanWALEntries(startExclusive+1, func(entry *blockvol.WALEntry) error {
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if entry.LSN > endInclusive {
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return nil // past requested range, stop
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}
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// In production: ship entry to replica over network.
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// Here: track the highest LSN successfully read.
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highestLSN = entry.LSN
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return nil
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})
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if err != nil {
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return highestLSN, fmt.Errorf("WAL scan from %d: %w", startExclusive, err)
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}
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return highestLSN, nil
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}
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// TransferSnapshot transfers a checkpoint/snapshot. Stub for P1.
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func (e *Executor) TransferSnapshot(snapshotLSN uint64) error {
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return fmt.Errorf("TransferSnapshot not implemented in P1")
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}
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// TransferFullBase reads the full extent image from blockvol for rebuild.
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// In production: streams the extent to the replica over network.
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// Here: validates the extent is readable at the committed boundary.
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func (e *Executor) TransferFullBase(committedLSN uint64) error {
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if e.vol == nil {
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return fmt.Errorf("no blockvol instance")
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}
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snap := e.vol.StatusSnapshot()
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if committedLSN > snap.WALHeadLSN {
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return fmt.Errorf("committed LSN %d beyond WAL head %d", committedLSN, snap.WALHeadLSN)
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}
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// In production: read extent blocks and stream to replica.
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// For now: validate the extent is accessible at this point.
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return nil
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}
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// TruncateWAL removes entries beyond truncateLSN. Stub for P1.
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func (e *Executor) TruncateWAL(truncateLSN uint64) error {
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return fmt.Errorf("TruncateWAL not implemented in P1")
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}
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