Apache Accumulo Hello World Example
This tutorial uses the following Java classes, which can be found in org.apache.accumulo.examples.helloworld in the accumulo-examples module:
- InsertWithBatchWriter.java - Inserts 10K rows (50K entries) into accumulo with each row having 5 entries
- InsertWithOutputFormat.java - Example of inserting data in MapReduce
- ReadData.java - Reads all data between two rows
Log into the accumulo shell:
$ ./bin/accumulo shell -u username -p password
Create a table called 'hellotable':
username@instance> createtable hellotable
Launch a Java program that inserts data with a BatchWriter:
$ ./bin/accumulo org.apache.accumulo.examples.helloworld.InsertWithBatchWriter instance zookeepers hellotable username password
Alternatively, the same data can be inserted using MapReduce writers:
$ ./bin/accumulo org.apache.accumulo.examples.helloworld.InsertWithOutputFormat instance zookeepers hellotable username password
On the accumulo status page at the URL below (where 'master' is replaced with the name or IP of your accumulo master), you should see 50K entries
http://master:50095/
To view the entries, use the shell to scan the table:
username@instance> table hellotable username@instance hellotable> scan
You can also use a Java class to scan the table:
$ ./bin/accumulo org.apache.accumulo.examples.helloworld.ReadData instance zookeepers hellotable username password row_0 row_1001
