apache/hadoop · error · StandbyException

Not supported by Standby Namenode.

Error message

Not supported by Standby Namenode.

What it means

Error "Not supported by Standby Namenode." thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java:2677

  }

  @Override // ReconfigurationProtocol
  public List<String> listReconfigurableProperties() throws IOException {
    checkNNStartup();
    String operationName = "listNamenodeReconfigurableProperties";
    namesystem.checkSuperuserPrivilege(operationName);
    List<String> result = Lists.newArrayList(nn.getReconfigurableProperties());
    namesystem.logAuditEvent(true, operationName, null);
    return result;
  }

  @Override
  public Long getNextSPSPath() throws IOException {
    checkNNStartup();
    String operationName = "getNextSPSPath";
    namesystem.checkSuperuserPrivilege(operationName);
    if (nn.isStandbyState()) {
      throw new StandbyException("Not supported by Standby Namenode.");
    }
    // Check that SPS is enabled externally
    StoragePolicySatisfyManager spsMgr =
        namesystem.getBlockManager().getSPSManager();
    StoragePolicySatisfierMode spsMode = (spsMgr != null ? spsMgr.getMode()
        : StoragePolicySatisfierMode.NONE);
    if (spsMode != StoragePolicySatisfierMode.EXTERNAL) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("SPS service mode is {}, so external SPS service is "
            + "not allowed to fetch the path Ids", spsMode);
      }
      throw new IOException("SPS service mode is " + spsMode + ", so "
          + "external SPS service is not allowed to fetch the path Ids");
    }
    return namesystem.getBlockManager().getSPSManager().getNextPathId();
  }

  @Override // ClientProtocol

View on GitHub (pinned to 2add963021)

Solutions

1. Issue the operation against the active NameNode; standby nodes reject this write/admin operation.

When it happens

Trigger: A client or admin command targets a standby NameNode for an active-only operation.

Common situations: Misconfigured clients or proxies pointing at the standby after a failover.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/8221821ef1059c71. Report an issue: GitHub.