Node.js HBase is a Node.JS client for the Apache HBase database. It use the Rest API (Stargate) to communicate with HBase. Currently, all the API is implemented and the data exchange format is JSON (but protocol buffer could follow).
Apache HBase is part of the Hadoop ecosystem. It describes itself as the Hadoop database optimized for random, realtime read/write access to big data. It is an open-source, distributed, versioned, column-oriented store modeled after Google Bigtable.
Client features include:
- Intuitive API following Apache HBase naming conventions
- Documentation and tests
- Full Implementation of the REST API
- Transparent encoding/decoding of values
- Scanner and filter support implementing the
stream.ReadableAPI - Kerberos Support
Apache HBase is part of the Hadoop ecosystem from the Apache Software Foundation. It is a column oriented database (think NoSql) that really scale and is modelled after Google papers and its BigTable database.
From your project directoy, via npm:
npm install hbase
# Or without the krb5 optional dependency
npm install hbase --no-optional- Index
Getting started - Client
Server information and object factory - Connection
HTTP REST requests - Row
CRUD operation on rows and columns - Scanner
Retrieve multiple rows and columns - Table
Create, modify and delete HBase tables
The following code initialise a new HBase instance, create a table and a column family, insert a record and read it.
const hbase = require('hbase')
// Instantiate a new client
client = hbase({ host: '127.0.0.1', port: 8080 })
// Create a table
client
.table('my_table' )
.create('my_column_family', function(err, success){
// Insert a record
client
.table('my_table' )
.row('my_row')
.put('my_column_family:my_column', 'my value', function(err, success){
// Read a record
client
.table('my_table' )
.row('my_row')
.get('my_column_family', function(err, [cell]){
// Validate the result
assert(cell.key, 'my_row')
assert(cell.column, 'my_column_family:my_column')
assert(cell.$, 'my value')
})
})
})Or shortly as:
// Instantiate a new client
require('hbase')({ host: '127.0.0.1', port: 8080 })
// Create a table
.table('my_table' )
.create('my_column_family', function(err, success){
// Insert a record
this.put('my_column_family:my_column', 'my value', function(err, success){
// Read a record
this.get('my_column_family', function(err, [[cell]]){
// Validate the result
// ...
})
})
})Options accepts a krb5 object. Password and keytab authentication are supported. Refer to the krb5 package for additionnal information on how to configure the krb5 option.
Using a keytab:
const hbase = require('hbase');
hbase({
host: '127.0.0.1',
port: 8080,
"krb5": {
"principal": "{username}@{REALM}",
"keytab": "{path/to/keytab}",
"service_principal": "HTTP@{fqdn}"
}
})
.version();Using a password:
const hbase = require('hbase');
hbase({
host: '127.0.0.1',
port: 8080,
"krb5": {
"principal": "{username}@{REALM}",
"password": "{password}",
"service_principal": "HTTP@{fqdn}"
}
})
.version();The scanner implement the stream.Readable API. For ease of usage, an optional
callback argument may be provided. For example:
client
.table('node_table')
.scan({
startRow: 'my_row',
maxVersions: 1
}, function(err, rows){
console.log(err, rows);
});is equivalent to:
const rows = [];
scanner = client
.table('node_table')
.scan({
startRow: 'my_row',
maxVersions: 1
});
scanner.on('readable', function(){
while(chunk = scanner.read()){
rows.push(chunk);
}
});
scanner.on('error', function(err){
console.log(err);
});
scanner.on('end', function(){
console.log(rows);
});It can be quite a pain to figure out what options can be sent with a scanner request. You will find a lot of examples inside the Scanner test and also look at the examples published by Marc Trudel.
- David Worms: https://www.adaltas.com
- Michael Kurze: https://github.com/michaelku
- Michal Taborsky: https://github.com/whizz
- Pierre Sauvage: https://github.com/Pierrotws
This package is developed by Adaltas.