Not able to access files in hadoop cluster - node.js

Question

I was trying to read the file present in hadoop cluster through the following code. The default port used is 9000. (since at 50700, it is not getting connected)
//webhdfs-read-tests.js
// Include webhdfs module
var WebHDFS = require('webhdfs');
var fs = require('fs');
// Create a new
var hdfs = WebHDFS.createClient({
user: 'ubuntu', // Hadoop user
host: 'localhost', // Namenode host
port: 9000 // Namenode port
});
// Initialize readable stream from HDFS source
var remoteFileStream = hdfs.createReadStream('/sample.txt');
// Variable for storing data
var data = new Buffer.alloc(10);
remoteFileStream.on('error', function onError(err) {
// Do something with the error
console.log(err);
//console.log('')
});
remoteFileStream.on('data', function onChunk(chunk) {
// Concat received data chunk
data = Buffer.concat([data, chunk]);
console.log('data', data);
});
remoteFileStream.on('finish', function onFinish() {
// Upload is done
// Print received data
console.log(data.toString());
});
The cluster looks like:
hadoop fs -ls -R /
2022-12-21 10:52:30,393 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
drwxr-xr-x - ubuntu supergroup 0 2022-12-21 08:28 /files
-rw-r--r-- 1 ubuntu supergroup 169 2022-12-21 08:28 /files/sample.txt
-rw-r--r-- 1 ubuntu supergroup 169 2022-12-21 10:24 /sample.txt
drwxr-xr-x - ubuntu supergroup 0 2022-12-21 08:30 /uploadedFiles
Also, the jps command gives:
jps
47232 ResourceManager
52208 Jps
46768 DataNode
46598 NameNode
47031 SecondaryNameNode
47405 NodeManager
After running the code, I got the following error message:
Error: Invalid request path or webhdfs is not enabled: /webhdfs/v1/sample.txt
at WebHDFS._parseError (/home/ubuntu/node_modules/webhdfs/lib/webhdfs.js:89:16)
at Request.onData (/home/ubuntu/node_modules/webhdfs/lib/webhdfs.js:656:32)
at Request.emit (events.js:198:13)
at IncomingMessage.<anonymous> (/home/ubuntu/node_modules/request/request.js:1073:12)
at IncomingMessage.emit (events.js:198:13)
at IncomingMessage.Readable.read (_stream_readable.js:505:10)
at flow (_stream_readable.js:974:34)
at resume_ (_stream_readable.js:955:3)
at process._tickCallback (internal/process/next_tick.js:63:19)
Can someone help me with this?

Answer 1

The solution is to use the correct port number.
9000 is the port of the namenode.
9870 is the port of webhdfs-> correct port.