/** Check whether the name-node can be started. */
private boolean canStartNameNode(Configuration conf) throws IOException {
NameNode nn2 = null;
try {
nn2 = NameNode.createNameNode(new String[] {}, conf);
} catch (IOException e) {
if (e instanceof java.net.BindException) return false;
throw e;
}
stopNameNode(nn2);
return true;
}
/** Start the name-node. */
public NameNode startNameNode() throws IOException {
String dataDir = System.getProperty("test.build.data");
hdfsDir = new File(dataDir, "dfs");
if (hdfsDir.exists() && !FileUtil.fullyDelete(hdfsDir)) {
throw new IOException("Could not delete hdfs directory '" + hdfsDir + "'");
}
config = new Configuration();
config.set("dfs.name.dir", new File(hdfsDir, "name1").getPath());
FileSystem.setDefaultUri(config, "hdfs://" + NAME_NODE_HOST + "0");
config.set("dfs.http.address", NAME_NODE_HTTP_HOST + "0");
NameNode.format(config);
String[] args = new String[] {};
// NameNode will modify config with the ports it bound to
return NameNode.createNameNode(args, config);
}
NNThroughputBenchmark(Configuration conf) throws IOException, LoginException {
config = conf;
// We do not need many handlers, since each thread simulates a handler
// by calling name-node methods directly
config.setInt("dfs.namenode.handler.count", 1);
// set exclude file
config.set("dfs.hosts.exclude", "${hadoop.tmp.dir}/dfs/hosts/exclude");
File excludeFile = new File(config.get("dfs.hosts.exclude", "exclude"));
if (!excludeFile.exists()) {
if (!excludeFile.getParentFile().mkdirs())
throw new IOException("NNThroughputBenchmark: cannot mkdir " + excludeFile);
}
new FileOutputStream(excludeFile).close();
// Start the NameNode
String[] argv = new String[] {};
nameNode = NameNode.createNameNode(argv, config);
}