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fix(core): retain buffered messages until memory writes succeed - #1426
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughConversation buffers version pending messages and retain them until matching writes succeed. The shared persistence queue retries failed writes within count and time limits. Agent generation and streaming log flush failures instead of propagating them. ChangesMemory persistence retries
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Agent
participant MemoryPersistQueue
participant ConversationBuffer
participant MemoryManager
participant Memory
Agent->>MemoryPersistQueue: Flush conversation messages
MemoryPersistQueue->>ConversationBuffer: Read pending messages with versions
MemoryPersistQueue->>MemoryManager: Save each pending message
MemoryManager->>Memory: Write message
alt Write succeeds
MemoryManager-->>MemoryPersistQueue: Resolve save
MemoryPersistQueue->>ConversationBuffer: Mark matching version persisted
else Write fails
MemoryManager-->>MemoryPersistQueue: Reject save
MemoryPersistQueue->>ConversationBuffer: Keep message pending
MemoryPersistQueue-->>Agent: Return flush failure
Agent->>Agent: Log failure and continue generation
end
Merge Risk: ⚪ Minimal · up to The change keeps conversation messages pending until their memory writes succeed and retries failed writes within bounded limits. No actionable merge-blocking risk remains from the supplied review. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Retrying failed writes improves conversation-history preservation, but failed requests may retain conversation data without an effective limit, and retry safety is not guaranteed for every storage adapter. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @packages/core/src/agent/memory-persist-queue.ts:
- Around line 119-134: Update MemoryPersistQueue persistence handling so a
rejected saveMessage retains the failed message in a conversation-scoped retry
store that outlives the operation-scoped queue. Retry retained messages during a
later successful persistence operation, and ensure enqueuePersist does not
discard the final failed entry before it can be retried.
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.changeset/memory-persist-retry.mdpackages/core/src/agent/conversation-buffer.tspackages/core/src/agent/memory-persist-queue.spec.tspackages/core/src/agent/memory-persist-queue.tspackages/core/src/memory/manager/memory-manager.spec.tspackages/core/src/memory/manager/memory-manager.ts
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @packages/core/src/agent/memory-persist-queue.ts:
- Around line 33-36: Bound the failed-operation retention associated with
MemoryPersistQueue.entriesByManager, which currently keeps each failed
ConversationBuffer and OperationContext alive indefinitely. Update
MemoryPersistQueue to persist pending messages durably or impose a bounded retry
strategy that preserves pending messages without retaining every operation in
memory.
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.changeset/memory-persist-retry.mdpackages/core/src/agent/agent.spec.tspackages/core/src/agent/agent.tspackages/core/src/agent/memory-persist-queue.spec.tspackages/core/src/agent/memory-persist-queue.ts
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Summary
Conversation persistence now acknowledges each buffered message after its memory write completes. If an adapter fails, the failed message and any later messages stay pending for the next flush. The queue opts into receiving storage errors from
MemoryManager.saveMessage()after its existing logging and tracing work, so it can tell whether a write actually succeeded.Background
The queue previously called
drainPendingMessages()before writing the batch. Draining cleared every pending ID at once. A failure on the first write therefore left the entire batch unavailable to a later flush; a failure midway through the batch lost the remaining messages. The manager's catch block could hide adapter failures from the queue by resolving its promise after logging the error.This is visible when a storage adapter has a temporary outage or a write times out. The live buffer can still contain the conversation, but the saved history lacks messages that the queue no longer knows to retry.
The queue writes messages sequentially for a conversation. That gives us a precise recovery rule: after a failed write, messages before it have been confirmed by storage, while the failed message and everything after it still need a write. The buffer now represents that rule directly instead of treating a whole batch as saved or unsaved at once.
Changes
drainPendingMessages()behavior for its other callers.MemoryManager.saveMessage()callers an explicitthrowOnErroroption, and use it in the persistence queue. DirectgenerateObjectandstreamObjectcallers retain their existing best-effort memory behavior.@voltagent/core.The version attached to a pending snapshot matters when a response is still being assembled. A message can gain a tool result or metadata while an earlier snapshot is awaiting storage. A successful write of the earlier snapshot acknowledges only that snapshot; the later version stays pending for the next flush.
Verification
pnpm exec vitest run packages/core/src/agent/memory-persist-queue.spec.ts packages/core/src/agent/conversation-buffer.spec.ts packages/core/src/memory/manager/memory-manager.spec.ts— 3 files, 30 tests passed.pnpm --filter @voltagent/core typecheck— passed.pnpm exec biome check packages/core/src/agent/conversation-buffer.ts packages/core/src/agent/memory-persist-queue.ts packages/core/src/agent/memory-persist-queue.spec.ts packages/core/src/memory/manager/memory-manager.ts packages/core/src/memory/manager/memory-manager.spec.ts— passed.Reviewer notes
The queue still serializes writes per conversation. Successful messages are acknowledged one at a time, so the retry set contains only work that has not been confirmed by storage. The version check protects updates that arrive between taking the snapshot and completing the write.
Closes #1425
Summary by cubic
Fixes conversation persistence so buffered messages stay pending until their memory writes succeed, and retries failed writes on later operations even across agent turns.
MemoryManager.saveMessage()gains athrowOnErroroption; the persistence queue opts in so failures stop pending messages, while agent responses remain best effort.@voltagent/core.Written for commit d0a5efd. Summary will update on new commits.
Summary by CodeRabbit