We will see how to create a table in Hive using SEQUENCEFILE format and how to import data into the table. Create table CREATE TABLE Employee( ID BIGINT, NAME STRING, AGE INT, SALARY BIGINT ) COMMENT ‘This is Employee table stored as sequencefile’ ROW FORMAT DELIMITED FIELDS TERMINATED BY ‘,’…
We will see how to create a table in Hive using TEXTFILE format and how to import data into the table. TEXTFILE Textfile format stores data as plain text files. Textfile format enables rapid development due to its simplicity but other file formats like ORC are much better when it comes…
BlockingQueue A BlockingQueue supports operations that :- 1. wait for some element to be available in the queue when retrieving an element. 2. wait for space to become available in the queue when storing an element. We will see implementation of a simple Producer-Consumer using BlockingQueue. We will be using…
In this article we will see how to run Hive queries through JDBC. We are using apache-hive-1.0.1 and hiveserver2 is running on port 10000 on localhost. Jars Required To access Hive through JDBC we need to add the following jars in the classpath:- guava-18.0.jar hive-common-1.0.0.jar hive-exec-0.13.0.jar hive-jdbc-1.0.0.jar hive-metastore-1.0.0.jar hive-serde-1.0.0.jar hive-service-1.0.0.jar…
In this article we will see how to perform file operations on HDFS using Java APIs. Hadoop core jar is required to be added to the classpath. The class org.apache.hadoop.fs.FileSystem provide APIs for performing operations on HDFS. 1. Read a file from HDFS //Imports import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; //Code to…