{"record":{"id":"9c72b2197ae58277","repo":"xai-org/x-algorithm","slug":"shard","errorCode":null,"errorMessage":"Shard {}: {}","messagePattern":"Shard (.+?): (.+?)","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"phoenix/crates/serving/xai-recsys-engine/src/storage_util.rs","lineNumber":1614,"sourceCode":"                        shard_idx,\n                        max_retries,\n                        last_error.unwrap_or_else(|| \"unknown\".to_string())\n                    ))\n                })\n            })\n            .collect();\n\n        join_all(futures)\n            .await\n            .into_iter()\n            .map(|r| r.map_err(|e| format!(\"Task join error: {}\", e)).and_then(|r| r))\n            .collect()\n    });\n\n    let failures: Vec<_> = upload_results\n        .iter()\n        .enumerate()\n        .filter_map(|(i, r)| r.as_ref().err().map(|e| (i, e.clone())))\n        .collect();\n\n    if !failures.is_empty() {\n        let error_msg = failures\n            .iter()\n            .map(|(i, e)| format!(\"Shard {}: {}\", i, e))\n            .collect::<Vec<_>>()\n            .join(\"; \");\n        return Err(pyo3::exceptions::PyRuntimeError::new_err(format!(\n            \"Failed to upload {} shards: {}\",\n            failures.len(),\n            error_msg\n        )));\n    }\n\n    info!(\n        \"Successfully resharded and uploaded {} row shards to {}\",\n        num_output_shards, output_url","sourceCodeStart":1596,"sourceCodeEnd":1632,"githubUrl":"https://github.com/xai-org/x-algorithm/blob/24c60942c5c5fdad3a6addffb4c6e6d2f228f04f/phoenix/crates/serving/xai-recsys-engine/src/storage_util.rs#L1596-L1632","documentation":"Error message produced by reshard_col_to_row_and_upload when one or more shard uploads fail during column-to-row resharding; it aggregates per-shard errors as 'Shard {i}: {err}'. The underlying cause is in each shard's error text (network, S3/HDFS auth, checksum, etc.).","triggerScenarios":"Calling reshard_col_to_row_and_upload where any parallel upload of a resharded shard fails — e.g. remote storage unreachable, expired credentials, wrong bucket/path, or disk full when writing temp shards.","commonSituations":"Uploading to object storage with expired tokens; misconfigured URL prefix; transient network flakiness across many shards causing at least one failure (the whole operation then errors).","solutions":["Read the per-shard error text to identify the root cause (auth vs network vs path)","Retry the operation — transient upload failures usually succeed on rerun","Verify storage credentials, bucket/path and urls argument","Check local disk space for temp shard files if the error mentions I/O"],"exampleFix":null,"handlingStrategy":"retry","validationCode":"# pre-flight: verify credentials and reachability of the upload target\n# (e.g. head bucket / check urls) before resharding","typeGuard":null,"tryCatchPattern":"for attempt in range(3):\n    try: reshard_col_to_row_and_upload(...); break\n    except Exception as e:\n        if 'Shard ' in str(e) and attempt < 2: time.sleep(2 ** attempt); continue\n        raise","preventionTips":["Monitor per-shard upload error rates and alert before full failures","Use idempotent shard keys so retries overwrite safely","Keep credentials fresh (auto-refresh tokens)"],"tags":["upload","resharding","storage","aggregated-errors"],"backgroundTag":"shard-upload-failed","analyzedSha":"24c60942c5c5fdad3a6addffb4c6e6d2f228f04f","analyzedAt":"2026-08-28T11:40:14.686Z","schemaVersion":2},"datasetVersion":"2026-08-28T16:17:29.566Z"}