{"record":{"id":"53d3f9ba69567cb2","repo":"influxdata/influxdb","slug":"failed-to-persist-updated-table-index","errorCode":null,"errorMessage":"Failed to persist updated table index: {:?}","messagePattern":"Failed to persist updated table index: (.+?)","errorType":"exception","errorClass":"TableIndexCacheError","httpStatus":null,"severity":"error","filePath":"influxdb3_write/src/table_index_cache.rs","lineNumber":938,"sourceCode":"        }\n\n        // Create updated table index with only remaining files\n        let updated_index = CoreTableIndex {\n            id: core_index.id.clone(),\n            files: remaining_files,\n            latest_snapshot_sequence_number: core_index.latest_snapshot_sequence_number,\n            metadata: core_index.metadata,\n        };\n\n        // Drop the lock before we do more operations\n        drop(core_index);\n\n        // Persist the updated index to object store\n        updated_index\n            .persist(Arc::clone(&self.inner.object_store))\n            .await\n            .map_err(|e| {\n                TableIndexCacheError::Unexpected(anyhow::anyhow!(\n                    \"Failed to persist updated table index: {:?}\",\n                    e\n                ))\n            })?;\n\n        // Update the cache with the new index\n        let new_cached = CachedTableIndex::new(updated_index);\n        {\n            let mut indices = self.inner.indices.write().await;\n            let db_map = indices.entry((node_id, db_id)).or_default();\n            db_map.insert(table_id, new_cached);\n        }\n\n        info!(\n            ?table_index_id,\n            cutoff_time_ns,\n            deleted_file_count = expired_files.len(),\n            \"Successfully purged expired files from table\"","sourceCodeStart":920,"sourceCodeEnd":956,"githubUrl":"https://github.com/influxdata/influxdb/blob/06200ef96ba82c5f6727e5038a83af8e722c6875/influxdb3_write/src/table_index_cache.rs#L920-L956","documentation":"A TableIndexCacheError::Unexpected wrapping an anyhow message 'Failed to persist updated table index: {:?}' — raised in purge_expired when the updated TableIndex could not be written back to the object store via updated_index.persist(...). The expiry purge succeeded in memory but the result could not be durably saved, so the purge is not effective until retried.","triggerScenarios":"Running the purge_expired flow (public) on a TableIndexCache where persist() to the object store returns a TableIndexError — store write failure, serialization failure, or connectivity loss at write time.","commonSituations":"Object store bucket write quota exceeded or throttling (S3 503 Slow Down); credentials rotated and losing write access mid-run; network partition to the blob store during expiry processing; snapshot size or request limits hit on very large indexes.","solutions":["Read the debug-formatted cause embedded in the message ({:?} of the TableIndexError) to classify I/O vs serialization failure.","Retry purge_expired — persistence is the last step, so a retry reuses the in-memory expiry result.","Verify bucket write permissions and quotas for the node's service account.","Check object store health/status page if failures cluster in time."],"exampleFix":"// before: one-shot persist, panic on failure\nupdated_index.persist(Arc::clone(&object_store)).await.map_err(...)?;\n// after: bounded retries\nfor attempt in 0..3 {\n  match updated_index.persist(Arc::clone(&object_store)).await {\n    Ok(()) => break,\n    Err(e) if attempt == 2 => return Err(map_err(e)),\n    Err(_) => tokio::time::sleep(backoff(attempt)).await,\n  }\n}","handlingStrategy":"retry","validationCode":"// Rust: probe write access before running the purge\nobject_store.put(&probe_path, Bytes::from_static(b\"ok\")).await\n  .expect(\"object store not writable; postpone purge_expired\");","typeGuard":"fn is_persist_unexpected(e: &TableIndexCacheError) -> bool {\n  matches!(e, TableIndexCacheError::Unexpected(msg) if msg.contains(\"Failed to persist updated table index\"))\n}","tryCatchPattern":"match purge_expired().await {\n  Err(e) if is_persist_unexpected(&e) => {\n    log::warn!(\"persist failed, retrying purge: {e:?}\");\n    retry_with_backoff(3, purge_expired).await\n  }\n  other => other,\n}","preventionTips":["Verify write IAM permissions and quotas before scheduled purge runs.","Use bounded retries with backoff for persist steps.","Monitor object store error rates and pause maintenance during incidents.","Keep the debug-formatted cause ({:?}) in logs to classify failures fast."],"tags":["object-store","persist","purge","influxdb3"],"backgroundTag":"file-write-failed","analyzedSha":"06200ef96ba82c5f6727e5038a83af8e722c6875","analyzedAt":"2026-09-19T12:55:30.003Z","contentChangedAt":"2026-09-19T12:55:30.003Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}