apache/iceberg · error · IllegalArgumentException

Unexpected delete file content: <deleteFile>

Error message

Unexpected delete file content: <deleteFile>

What it means

When building a TableChange from delete files, Iceberg distinguishes position deletes and equality deletes; the switch over DeleteFile.content() has a default arm that throws if the content is neither POSITION_DELETES nor EQUALITY_DELETES. Since the enum is closed, this signals a new/unexpected delete-file content type reaching the maintenance trigger code.

Source

Thrown at flink/v1.20/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/TableChange.java:85

    dataFiles.forEach(
        dataFile -> {
          this.dataFileCount++;
          this.dataFileSizeInBytes += dataFile.fileSizeInBytes();
        });

    deleteFiles.forEach(
        deleteFile -> {
          switch (deleteFile.content()) {
            case POSITION_DELETES:
              this.posDeleteFileCount++;
              this.posDeleteRecordCount += deleteFile.recordCount();
              break;
            case EQUALITY_DELETES:
              this.eqDeleteFileCount++;
              this.eqDeleteRecordCount += deleteFile.recordCount();
              break;
            default:
              throw new IllegalArgumentException("Unexpected delete file content: " + deleteFile);
          }
        });

    this.commitCount = 1;
  }

  static TableChange empty() {
    return new TableChange(0, 0L, 0, 0L, 0, 0L, 0);
  }

  public static Builder builder() {
    return new Builder();
  }

  int dataFileCount() {
    return dataFileCount;
  }

View on GitHub (pinned to 86d9c8fc54)

Solutions

1. Upgrade the iceberg-flink runtime so it recognizes all delete file content types produced by the writer version.
2. Check the table metadata for delete files with unexpected content values.
3. Exclude the problematic snapshots from maintenance until versions are aligned.

if (deleteFile.content() != ContentFile.POSITION_DELETES && deleteFile.content() != ContentFile.EQUALITY_DELETES) { /* skip or upgrade */ }

switch (deleteFile.content()) { case POSITION_DELETES, EQUALITY_DELETES -> { /* handle */ } default -> { /* unsupported */ } }

try { buildTableChange(deleteFiles); } catch (IllegalArgumentException e) { if (e.getMessage().startsWith("Unexpected delete file content")) { upgradeRuntimeOrSkip(); } }

When it happens

Trigger: A DeleteFile with content other than EQUALITY_DELETES or POSITION_DELETES is fed into the TableChange constructor that aggregates delete-file statistics.

Common situations: Running an older iceberg-flink maintenance job against tables written by a newer Iceberg spec that introduces new delete-file content types; corrupted metadata listing unexpected content.

Related errors

• Invalid operator event type: <event.getClass().getCanonicalN
• Invalid operator event type: <event.getClass().getCanonicalN
• Invalid operator event type: <event.getClass().getCanonicalN
• Unexpected delete file content:
• Unexpected delete file content:

AI-assisted analysis of apache/iceberg@86d9c8fc54 (2026-09-12). Data as JSON: /api/errors/1ff807c86fb0622b. Report an issue: GitHub.