Creating UDF in HIVE Hadoop

In this blog “Creating UDF in HIVE Hadoop” I am going to show you how to create a UDF ( User Defined Functions) in HIVE.

1) Create a Java class Sha1encryption.Java


import org.apache.hadoop.hive.ql.exec.UDF;

public final class Sha1encryption extends UDF {

public Text evaluate(final Text s) {
if (s == null) {
return null;
try {
MessageDigest md = MessageDigest.getInstance("SHA-1");
byte[] md5hash = md.digest();
StringBuilder builder = new StringBuilder();
for (byte b : md5hash) {
builder.append(Integer.toString((b & 0xff) + 0x100, 16).substring(1));
return new Text(builder.toString());
} catch (NoSuchAlgorithmException nsae) {
System.out.println("Cannot find digest algorithm");
return null;

2) Exporting the JAR to the machine where Hive is running

3) Register the JAR in HIVE and then use it in your SELECT statement

add jar /home/notroot/lab/programs/HadoopTraining.jar;
create temporary function encryption as '';

use trainingsun;
select encryption(name),age,mark,gender from students;

Thanks have a great day ! enjoy

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