{"record":{"id":"66378617b78b71da","repo":"influxdata/influxdb","slug":"could-not-interpret-bytes-as-partitionhashid-data","errorCode":null,"errorMessage":"Could not interpret bytes as `PartitionHashId`: {data:?}","messagePattern":"Could not interpret bytes as `PartitionHashId`: (.+?)","errorType":"validation","errorClass":"PartitionHashIdError","httpStatus":null,"severity":"error","filePath":"core/data_types/src/partition.rs","lineNumber":369,"sourceCode":"        // https://github.com/rust-lang/rust/issues/90091\n        //\n        // So we implement this the hard way (to avoid some nasty panic paths that are quite expensive within a hash function).\n        // Conversion borrowed from https://github.com/rust-lang/rfcs/issues/1833#issuecomment-269509262\n        const N_BYTES: usize = u64::BITS as usize / 8;\n\n        const _: () = assert!(PARTITION_HASH_ID_SIZE_BYTES >= N_BYTES);\n        let ptr = self.0.as_ptr() as *const [u8; N_BYTES];\n        let sub: &[u8; N_BYTES] = unsafe { &*ptr };\n\n        state.write_u64(u64::from_ne_bytes(*sub));\n    }\n}\n\n/// Reasons bytes specified aren't a valid `PartitionHashId`.\n#[derive(Debug, Error)]\npub enum PartitionHashIdError {\n    /// The bytes specified were not valid\n    #[error(\"Could not interpret bytes as `PartitionHashId`: {data:?}\")]\n    InvalidBytes {\n        /// The bytes used in the attempt to create a `PartitionHashId`\n        data: Vec<u8>,\n    },\n}\n\nimpl TryFrom<&[u8]> for PartitionHashId {\n    type Error = PartitionHashIdError;\n\n    fn try_from(data: &[u8]) -> Result<Self, Self::Error> {\n        let data: [u8; PARTITION_HASH_ID_SIZE_BYTES] =\n            data.try_into()\n                .map_err(|_| PartitionHashIdError::InvalidBytes {\n                    data: data.to_vec(),\n                })?;\n\n        Ok(Self(Arc::new(data)))\n    }","sourceCodeStart":351,"sourceCodeEnd":387,"githubUrl":"https://github.com/influxdata/influxdb/blob/06200ef96ba82c5f6727e5038a83af8e722c6875/core/data_types/src/partition.rs#L351-L387","documentation":"This error is returned when a byte slice cannot be interpreted as a `PartitionHashId`, the hashed form of a partition key used internally for partition identification. The library throws it because the byte representation must match the expected structure/length of a `PartitionHashId`; any other bytes are rejected at construction time rather than silently producing a bogus identifier. The offending bytes are attached in the `data` field for diagnosis.","triggerScenarios":"Calling `PartitionHashId::try_from(&[u8])` / `TryFrom<Vec<u8>>` (or deserialization paths that convert raw bytes into a `PartitionHashId`) with a byte vector whose length or layout does not match a valid hashed partition identifier.","commonSituations":"Restoring or importing data from a different version whose partition-hash encoding changed; hand-editing or corrupting catalog/parquet metadata that stores the hash bytes; passing a partition key name instead of its hashed bytes; truncated or concatenated byte buffers read from storage.","solutions":["Inspect the `data` field of the error and verify the byte length matches what `PartitionHashId` expects for the current library version","Regenerate the hash from the original `PartitionKey` via the library's hashing API instead of reusing stored raw bytes","Check for version mismatch between the code producing the bytes (catalog, parquet files, WAL) and this library version; upgrade/migrate consistently","Validate the storage/serialization path for truncation or corruption before calling the conversion"],"exampleFix":"// before\nlet bytes: Vec<u8> = partition_key.as_bytes().to_vec(); // raw key, not hashed\nlet hash_id = PartitionHashId::try_from(bytes)?;\n// after\nlet hash_id = PartitionHashId::from_parts(sorted_key_parts); // let the library build the hash","handlingStrategy":"validation","validationCode":"fn is_plausible_hash_id(bytes: &[u8]) -> bool {\n    // must be non-empty and match the expected encoded hash length\n    !bytes.is_empty() && bytes.len() == EXPECTED_PARTITION_HASH_LEN\n}\nlet hash_id = if is_plausible_hash_id(&raw) {\n    PartitionHashId::try_from(raw.to_vec()).ok()\n} else { None };","typeGuard":"fn as_partition_hash_id(bytes: &[u8]) -> Option<PartitionHashId> {\n    PartitionHashId::try_from(bytes.to_vec()).ok()\n}","tryCatchPattern":"match PartitionHashId::try_from(bytes) {\n    Ok(id) => /* use id */,\n    Err(PartitionHashIdError::InvalidBytes { data }) => {\n        eprintln!(\"bad partition hash bytes ({:?}): regenerate from partition key\", data);\n        // re-derive hash from the original PartitionKey or skip the record\n    }\n}","preventionTips":["Never hand-construct hash bytes; always derive `PartitionHashId` from the original `PartitionKey` via library APIs","Keep producer and consumer library versions in sync when persisting hash bytes to disk","Round-trip test any serialization path that stores/loads partition hash bytes","Log the offending bytes (`data`) to spot truncation or encoding drift early"],"tags":["rust","partition","byte-decoding","data-types"],"backgroundTag":"invalid-argument-format","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"}