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How to make a PIG UDF
An Eclipse Beginners Guide…
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The Java UDF ‘how to’
http://pig.apache.org/docs/r0.8.1/udf.html
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Simple UDF Script
-- myscript.pig
REGISTER myudfs.jar;
A = LOAD 'student_data'
AS (name: chararray, age: int, gpa: float);
B = FOREACH A
GENERATE myudfs.UPPER(name);
DUMP B;
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The simple UDF
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So… let’s write this UDF…
1. Start Eclipse
2. Create a new Java Project
3. Add pig.jar as an external Jar
4. Write our UDF class
5. Compile to a JAR
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So… let’s write this UDF…
1. Start Eclipse
2. Create a new Java Project
3. Add pig.jar as an external Jar
4. Write our UDF class
5. Compile to a JAR
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So… let’s write this UDF…
1. Start Eclipse
2. Create a new Java Project
3. Add pig.jar as an external Jar
4. Write our UDF class
5. Compile to a JAR
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So… let’s write this UDF…
1. Start Eclipse
2. Create a new Java Project
3. Add pig.jar as an external Jar
4. Write our UDF class
5. Compile to a JAR
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So… let’s write this UDF…
1. Start Eclipse
2. Create a new Java Project
3. Add pig.jar as an external Jar
4. Write our UDF class
5. Compile to a JAR
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1. Start Eclipse
2. Create a new Java Project
3. Add pig.jar as an external Jar
4. Write our UDF class
5. Compile to a JAR
So… let’s write this UDF…
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That’s it!
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