TEST_ERROR: test_zerocopy: nmdGetNameNodePort returned error

Error message

TEST_ERROR: test_zerocopy: nmdGetNameNodePort returned error %d

What it means

Error "TEST_ERROR: test_zerocopy: nmdGetNameNodePort returned 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:257

{
    int port;
    struct NativeMiniDfsConf conf = {
        1, /* doFormat */
        0, /* webhdfsEnabled */
        0, /* namenodeHttpPort */
        1, /* configureShortCircuit */
    };
    char testFileName[TEST_FILE_NAME_LENGTH];
    hdfsFS fs;
    struct NativeMiniDfsCluster* cl;
    struct hdfsBuilder *bld;

    cl = nmdCreate(&conf);
    EXPECT_NONNULL(cl);
    EXPECT_ZERO(nmdWaitClusterUp(cl));
    port = nmdGetNameNodePort(cl);
    if (port < 0) {
        fprintf(stderr, "TEST_ERROR: test_zerocopy: "
                "nmdGetNameNodePort returned error %d\n", port);
        return EXIT_FAILURE;
    }
    bld = hdfsNewBuilder();
    EXPECT_NONNULL(bld);
    EXPECT_ZERO(nmdConfigureHdfsBuilder(cl, bld));
    hdfsBuilderSetForceNewInstance(bld);
    hdfsBuilderConfSetStr(bld, "dfs.block.size",
                          TO_STR(TEST_ZEROCOPY_FULL_BLOCK_SIZE));
    /* ensure that we'll always get our mmaps */
    hdfsBuilderConfSetStr(bld, "dfs.client.read.shortcircuit.skip.checksum",
                          "true");
    fs = hdfsBuilderConnect(bld);
    EXPECT_NONNULL(fs);
    EXPECT_ZERO(createZeroCopyTestFile(fs, testFileName,
          TEST_FILE_NAME_LENGTH));
    EXPECT_ZERO(doTestZeroCopyReads(fs, testFileName));
    EXPECT_ZERO(hdfsDisconnect(fs));

View on GitHub (pinned to 2add963021)

Solutions

Read the accompanying nmdGetNameNodePort error for the specific cause (usually a bad port value).
Provide a valid NameNode port through the expected environment variable and rerun the test.

When it happens

Trigger: test_zerocopy aborts because nmdGetNameNodePort returned an error code.

Common situations: Test harness misconfiguration: the port the zerocopy test needs was not supplied or could not be parsed.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/4f4bcbe5ba86c8ec. Report an issue: GitHub.