apache/iceberg · error · UnsupportedOperationException

this.getClass().getName() + " does not support…

Error message

this.getClass().getName() + " does not support writeManifestsWith"

What it means

Default-method guard on SnapshotUpdate: thrown when writeManifestsWith(executorService, parallelism) is invoked on a snapshot-update implementation that did not override it. The message names the runtime class. It means parallel manifest writing with explicit parallelism is not wired up for that operation — the executor arguments are irrelevant.

Solutions

1. Use scanManifestsWith for read-side parallelism, or accept the default worker pool for manifest writes
2. Catch UnsupportedOperationException and commit without custom manifest-write parallelism
3. Override writeManifestsWith in the operation implementation

When it happens

Trigger: Thrown at api/src/main/java/org/apache/iceberg/SnapshotUpdate.java:75 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/iceberg@86d9c8fc54 (2026-09-12). Data as JSON: /api/errors/a904b487df8b999b. Report an issue: GitHub.

Appendix: source

Thrown at api/src/main/java/org/apache/iceberg/SnapshotUpdate.java:75

   *
   * @param executorService the provided executor
   * @return this for method chaining
   */
  ThisT scanManifestsWith(ExecutorService executorService);

  /**
   * Use a particular executor to write manifests during commit with the specified parallelism. The
   * default worker pool will be used by default.
   *
   * <p>The parallelism parameter controls how many manifest writers are used, which informs the
   * number of manifest files produced. The executor provides the threads for parallel execution.
   *
   * @param executorService the provided executor
   * @param parallelism the number of parallel manifest writers to use
   * @return this for method chaining
   */
  default ThisT writeManifestsWith(ExecutorService executorService, int parallelism) {
    throw new UnsupportedOperationException(
        this.getClass().getName() + " does not support writeManifestsWith");
  }

  /**
   * Perform operations on a particular branch
   *
   * @param branch which is name of SnapshotRef of type branch.
   * @return this for method chaining
   */
  default ThisT toBranch(String branch) {
    throw new UnsupportedOperationException(
        String.format(
            "Cannot commit to branch %s: %s does not support branch commits",
            branch, this.getClass().getName()));
  }

  default ThisT validateWith(SnapshotAncestryValidator validator) {
    throw new UnsupportedOperationException(

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