Open Data Infrastructure
Apache XTable: Cross-Format Interoperability Explained
Apache XTable explained as cross-format metadata translation across Iceberg, Delta, and Hudi, with the limits buyers need to understand.
Apache XTable exists because the lakehouse format war created a practical problem: a lot of data is already in one table format, and the next engine wants another one.
XTable translates metadata, not magic
Apache XTable is not a new table format. It is a cross-format translation project. The basic idea is to make data written in one open table format available to engines that understand another by generating compatible metadata.
That distinction matters. Parquet files may be shared, but table formats carry the higher-level contract: snapshots, schemas, partitions, deletes, and table history. XTable works in that metadata layer. It helps teams reduce format friction without pretending all table formats are identical.
The limits are where the value is
The useful way to evaluate XTable is not "does it make everything interoperable?" Nothing does. The right question is which table features translate cleanly, which features require constraints, and which operational patterns still need native support.
Deletes, schema evolution, partition changes, streaming writes, and concurrent writers are the places to inspect. If a feature exists in one format but does not map cleanly into another, the translation layer has to choose a behavior. That choice becomes part of your architecture.
Core idea: cross-format interoperability is valuable because it buys time and optionality. It does not erase the need to pick clear table ownership.
Where XTable fits in ODI
In an ODI stack, XTable sits near the boundary between table metadata and engine access. It can help teams avoid forcing every workload to migrate at once. It can also help buyers resist one-format absolutism when the estate already contains Delta, Iceberg, and Hudi.
That said, XTable should not become a permanent excuse to avoid architecture decisions. If a domain has strategic value, decide which table format owns the write path, which catalog owns operations, and which engines are supported.
Questions to ask before using it
- Which format owns writes?
- Which engines are read-only during translation?
- Which table features are out of scope or constrained?
- How will lineage, access, and incident recovery work across the translated view?
XTable is useful when it makes a transition safer. It is dangerous when it lets teams pretend a transition is unnecessary.
Sources to start with
These are the primary sources I would start from when checking the claims in this piece.