void *
athread(void *v)
{
struct hdfs_namenode *nn;
struct hdfs_object *rpc;
struct hdfs_object *object;
const char *error;
struct hdfs_rpc_response_future futures[100];
unsigned i;
bool ok;
nn = v;
// getProtocolVersion(61)
rpc = hdfs_rpc_invocation_new(
"getProtocolVersion",
hdfs_string_new(HADOOFUS_CLIENT_PROTOCOL_STR),
hdfs_long_new(61),
NULL);
for (i = 0; i < 100; i++) {
futures[i] = HDFS_RPC_RESPONSE_FUTURE_INITIALIZER;
error = hdfs_namenode_invoke(nn, rpc, &futures[i]);
if (error) {
warnx("namenode_invoke: %s", error);
goto out;
}
}
for (i = 0; i < 100; i++) {
// Get the response (should be long(61))
ok = hdfs_future_get_timeout(&futures[i], &object, 2000/*ms*/);
if (!ok) {
warnx("timeout waiting for result from NN server");
continue;
}
if (object->ob_type != H_LONG ||
object->ob_val._long._val != 61L)
printf("bad result\n");
hdfs_object_free(object);
}
out:
hdfs_object_free(rpc);
return NULL;
}
int
main(int argc, char **argv)
{
const char *err,
*host = "localhost",
*port = "8020";
struct hdfs_namenode namenode;
struct hdfs_object *rpc;
struct hdfs_rpc_response_future future;
struct hdfs_object *object;
if (argc > 1) {
if (strcmp(argv[1], "-h") == 0) {
printf("Usage: ./helloworld [host [port]]\n");
exit(0);
}
host = argv[1];
if (argc > 2)
port = argv[2];
}
// Initialize the connection object and connect to the local namenode
hdfs_namenode_init(&namenode, HDFS_NO_KERB);
err = hdfs_namenode_connect(&namenode, host, port);
if (err)
goto out;
// Pretend to be the user "mapred"
err = hdfs_namenode_authenticate(&namenode, "mapred");
if (err)
goto out;
// Call getProtocolVersion(61)
future = HDFS_RPC_RESPONSE_FUTURE_INITIALIZER;
rpc = hdfs_rpc_invocation_new(
"getProtocolVersion",
hdfs_string_new(HADOOFUS_CLIENT_PROTOCOL_STR),
hdfs_long_new(61),
NULL);
err = hdfs_namenode_invoke(&namenode, rpc, &future);
hdfs_object_free(rpc);
if (err)
goto out;
// Get the response (should be long(61))
hdfs_future_get(&future, &object);
if (object->ob_type == H_LONG &&
object->ob_val._long._val == 61L)
printf("success\n");
else
printf("bad result\n");
hdfs_object_free(object);
out:
if (err)
fprintf(stderr, "hdfs error: %s\n", err);
// Destroy any resources used by the connection
hdfs_namenode_destroy(&namenode, NULL);
return 0;
}