apache/hadoop · error

EIO

EIO

Error message

nmdGetNameNodePort failed with error %d

What it means

Error "nmdGetNameNodePort failed with error %d " thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfs-tests/test_libhdfs_zerocopy.c:213

        blockLen = getZeroCopyBlockLen(blockIdx);
        data = getZeroCopyBlockData(blockIdx);
        EXPECT_NONNULL(data);
        EXPECT_INT_EQ(blockLen, hdfsWrite(fs, file, data, blockLen));
    }
    EXPECT_ZERO(hdfsCloseFile(fs, file));
    return 0;
}

static int nmdConfigureHdfsBuilder(struct NativeMiniDfsCluster *cl,
                            struct hdfsBuilder *bld) {
    int ret;
    tPort port;
    const char *domainSocket;

    hdfsBuilderSetNameNode(bld, "localhost");
    port = (tPort) nmdGetNameNodePort(cl);
    if (port < 0) {
      fprintf(stderr, "nmdGetNameNodePort failed with error %d\n", -port);
      return EIO;
    }
    hdfsBuilderSetNameNodePort(bld, port);

    domainSocket = hdfsGetDomainSocketPath(cl);

    if (domainSocket) {
      ret = hdfsBuilderConfSetStr(bld, "dfs.client.read.shortcircuit", "true");
      if (ret) {
        return ret;
      }
      ret = hdfsBuilderConfSetStr(bld, "dfs.domain.socket.path",
                                  domainSocket);
      if (ret) {
        return ret;
      }
    }
    return 0;

View on GitHub (pinned to 2add963021)

Solutions

1. Set the environment variable used by nmdGetNameNodePort (e.g. LIBHDFS_ZERO_COPY_PORT / HDFS config) to a valid numeric port.
2. Verify the port value is parseable and within 1-65535.
3. Confirm the mini-cluster or real NameNode configuration that supplies the port is in place.

When it happens

Trigger: nmdGetNameNodePort helper failed to resolve the NameNode port needed by the zerocopy test.

Common situations: Missing or malformed environment/config value for the NameNode port when running test_libhdfs_zerocopy.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/a525d8c58bf95019. Report an issue: GitHub.