apache/hadoop · error · UnsupportedActionException

{} is not yet supported.

Error message

{} is not yet supported.

What it means

Error "{} is not yet supported." thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java:1432

  @Override // ClientProtocol
  public boolean upgradeStatus() throws IOException {
    checkNNStartup();
    return namesystem.isUpgradeFinalized();
  }

  @Override // ClientProtocol
  public RollingUpgradeInfo rollingUpgrade(RollingUpgradeAction action) throws IOException {
    checkNNStartup();
    LOG.info("rollingUpgrade " + action);
    switch(action) {
    case QUERY:
      return namesystem.queryRollingUpgrade();
    case PREPARE:
      return namesystem.startRollingUpgrade();
    case FINALIZE:
      return namesystem.finalizeRollingUpgrade();
    default:
      throw new UnsupportedActionException(action + " is not yet supported.");
    }
  }

  @Override // ClientProtocol
  public void metaSave(String filename) throws IOException {
    checkNNStartup();
    namesystem.metaSave(filename);
  }

  @Deprecated
  @Override // ClientProtocol
  public BatchedEntries<OpenFileEntry> listOpenFiles(long prevId)
      throws IOException {
    return listOpenFiles(prevId, EnumSet.of(OpenFilesType.ALL_OPEN_FILES),
        OpenFilesIterator.FILTER_PATH_DEFAULT);
  }

  @Override // ClientProtocol

View on GitHub (pinned to 2add963021)

Solutions

1. Avoid the unsupported operation on this NameNode, or upgrade to a version that implements it.

When it happens

Trigger: A client RPC requests a feature the NameNode reports as not yet supported.

Common situations: Calling experimental or newer protocol operations against this NameNode build.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/7111c67d2440dd33. Report an issue: GitHub.