{"record":{"id":"2ff79f873d47aaa0","repo":"mastra-ai/mastra","slug":"knowledge-semantic-index-is-stale-because-operatio","errorCode":null,"errorMessage":"Knowledge semantic index is stale because operation ${entry.id} could not be applied.","messagePattern":"Knowledge semantic index is stale because operation (.+?) could not be applied\\.","errorType":"exception","errorClass":"StaleKnowledgeSemanticIndexError","httpStatus":null,"severity":"warning","filePath":"packages/memory/src/processors/observational-memory/subconscious/semantic-index.ts","lineNumber":144,"sourceCode":"          throw new StaleKnowledgeSemanticIndexError(\n            'Knowledge semantic index is stale: a visible operation is pending or being processed by another worker.',\n          );\n        }\n        return processed;\n      }\n\n      for (let index = 0; index < entries.length; index++) {\n        const entry = entries[index]!;\n        try {\n          await this.#apply(entry);\n          await this.#knowledge.completeSemanticOutbox({ ids: [entry.id], workerId: this.#workerId });\n          processed++;\n        } catch (error) {\n          await this.#knowledge.releaseSemanticOutbox({\n            ids: entries.slice(index).map(pendingEntry => pendingEntry.id),\n            workerId: this.#workerId,\n          });\n          throw new StaleKnowledgeSemanticIndexError(\n            `Knowledge semantic index is stale because operation ${entry.id} could not be applied.`,\n            { cause: error },\n          );\n        }\n      }\n    }\n    throw new StaleKnowledgeSemanticIndexError(\n      `Knowledge semantic index remained stale after ${MAX_DRAIN_BATCHES} processing batches.`,\n    );\n  }\n\n  async #apply(entry: KnowledgeSemanticOutboxEntry): Promise<void> {\n    if (entry.operation === 'delete') {\n      await this.#deleteDocument(entry.documentId);\n      return;\n    }\n\n    const document = await this.#loadDocument(entry);","sourceCodeStart":126,"sourceCodeEnd":162,"githubUrl":"https://github.com/mastra-ai/mastra/blob/75dd419e613fe9c39f846ffc500716141b74fda6/packages/memory/src/processors/observational-memory/subconscious/semantic-index.ts#L126-L162","documentation":"Inside `#drain` (semantic-index.ts:144), if applying an outbox operation (`#apply`) throws — e.g. embedding or vector-store failure — the worker releases all remaining entries back to 'pending' (so another worker can retry) and throws `StaleKnowledgeSemanticIndexError` with the original error as `cause`, signaling the index could not be brought up to date.","triggerScenarios":"`#apply(entry)` rejects while draining: embedder API error on the document text, vector store insert/delete failure, index creation failure, or malformed outbox entry (e.g. missing document text).","commonSituations":"Embedding provider rate limits or outages during indexing; vector DB connection issues; oversized documents exceeding embedder limits; corrupted outbox rows after a partial migration.","solutions":["Inspect `error.cause` for the underlying embedder/vector-store failure and fix it (credentials, rate limits, payload size).","Retry — the failed entries were released back to 'pending', so a subsequent drain can reprocess them.","Add idempotent retry/backoff in your indexing worker; validate outbox entries before applying."],"exampleFix":"// before\nawait remind(context); // StaleKnowledgeSemanticIndexError, cause hidden\n// after\ntry {\n  await remind(context);\n} catch (e) {\n  if (e instanceof StaleKnowledgeSemanticIndexError && e.cause) {\n    console.error('underlying cause:', e.cause); // fix root cause, then retry\n  }\n  throw e;\n}","handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":"try {\n  return await remind(context);\n} catch (e) {\n  if (e instanceof StaleKnowledgeSemanticIndexError && e.cause) {\n    logger.error('outbox apply failed', { cause: e.cause });\n    await new Promise((r) => setTimeout(r, 2000));\n    return remind(context); // entries were released back to pending\n  }\n  throw e;\n}","preventionTips":["Always log/inspect error.cause to fix the root embedder/vector-store failure.","Add retry/backoff to the indexing worker for transient provider errors.","Validate document size and content against embedder limits before capture."],"tags":["outbox","stale-index","retry"],"backgroundTag":"stale-semantic-index","analyzedSha":"75dd419e613fe9c39f846ffc500716141b74fda6","analyzedAt":"2026-08-30T00:15:31.844Z","schemaVersion":2},"datasetVersion":"2026-08-30T03:17:51.788Z"}