Apache HBase - Just the Basics
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HBase is a NoSQL datastore built on HDFS, designed for high throughput and efficient random reads and writes, focusing on access patterns rather than traditional relational database structures. It provides various APIs including Java, REST, and Thrift for data manipulation and supports bulk loading and denormalized table structures. Effective schema design in HBase necessitates careful planning around row keys and access patterns to optimize performance.
![setConf(HBaseConfiguration.create(getConf()));
Connection connection = null;
Table table = null;
try {
// Define the table and column family for the data
TableName TABLE_NAME = TableName.valueOf("hbasetable");
byte[] CF = Bytes.toBytes("colfamily");
// Connect to the table
connection = ConnectionFactory.createConnection(getConf());
table = connection.getTable(TABLE_NAME);
// Create a put and add columns to it
Put p = new Put(Bytes.toBytes("rowkey"));
p.addColumn(CF, Bytes.toBytes("columnqual"), Bytes.toBytes(42.0d));
// Add the new column to the row
table.put(p);
} finally {
// close everything down
if (table != null)
table.close();
if (connection != null)
connection.close();
}
Puts](https://image.slidesharecdn.com/justthebasics-160803163145/85/Apache-HBase-Just-the-Basics-15-320.jpg)
![// Define the table and column family for the data
TableName TABLE_NAME = TableName.valueOf("hbasetable");
byte[] CF = Bytes.toBytes("colfamily");
// Connect to the table
connection = ConnectionFactory.createConnection(getConf());
table = connection.getTable(TABLE_NAME);
// Create a get with the row key you want
Get g = new Get(Bytes.toBytes("rowkey"));
// Get the row and bytes the for the cell
Result result = table.get(g);
byte[] value = result.getValue(CF, Bytes.toBytes("columnqual"));
// Yes, your client will need to know the type of data in the cell
double doubleValue = Bytes.toDouble(value);
Gets](https://image.slidesharecdn.com/justthebasics-160803163145/85/Apache-HBase-Just-the-Basics-16-320.jpg)
