apache/hadoop · error · IOException

Unsupported version: <ver>

Error message

Unsupported version: <ver>

What it means

Error "Unsupported version: <ver>" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/bloom/Filter.java:214

  @Override
  public void write(DataOutput out) throws IOException {
    out.writeInt(VERSION);
    out.writeInt(this.nbHash);
    out.writeByte(this.hashType);
    out.writeInt(this.vectorSize);
  }

  @Override
  public void readFields(DataInput in) throws IOException {
    int ver = in.readInt();
    if (ver > 0) { // old unversioned format
      this.nbHash = ver;
      this.hashType = Hash.JENKINS_HASH;
    } else if (ver == VERSION) {
      this.nbHash = in.readInt();
      this.hashType = in.readByte();
    } else {
      throw new IOException("Unsupported version: " + ver);
    }
    this.vectorSize = in.readInt();
    this.hash = new HashFunction(this.vectorSize, this.nbHash, this.hashType);
  }
}//end class

View on GitHub (pinned to 2add963021)

Solutions

1. The serialized filter has version <ver>, which this code cannot read. Rewrite the filter with a compatible version, or upgrade the reader to support that version.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/bloom/Filter.java:214 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/1c16254dc034f19a. Report an issue: GitHub.