pig java udf

https://github.com/alanfgates/programmingpig/blob/master/udfs/java/com/acme/math/Pow.java

$ hadoop version

Hadoop 2.0.0-cdh4.3.0
Subversion file:///data/1/jenkins/workspace/generic-package-centos64-5-5/topdir/BUILD/hadoop-2.0.0-cdh4.3.0/src/hadoop-common-project/hadoop-common -r 48a9315b342ca16de92fcc5be95ae3650629155a
Compiled by jenkins on Mon May 27 19:45:28 PDT 2013
From source with checksum a4218d77f9b12df4e3e49ef96f9d357d
This command was run using /usr/lib/hadoop/hadoop-common-2.0.0-cdh4.3.0.jar

$ pig -version

which: no hbase in (:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin)
Apache Pig version 0.11.0-cdh4.3.0 (rexported)
compiled May 27 2013, 20:40:51

$ javac -cp /usr/lib/pig/\* -d Pow Pow.java ; jar cvf pow.jar -C Pow .

added manifest
adding: Pow.class(in = 2452) (out= 1240)(deflated 49%)

$ cat pow.pig

REGISTER '/some/directory/pow.jar';
A = LOAD '/tmp/pow_input.txt' USING PigStorage('\t') AS (base:int, exponent:int);
B = FOREACH A GENERATE base, exponent, Pow(base, exponent);
STORE B INTO '/tmp/pow_output' USING PigStorage('\t');

$ hadoop fs -cat /tmp/pow_input.txt
2       3
3       2

$ pig -f pow.pig

...

2013-09-20 20:04:32,357 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - 0% complete
2013-09-20 20:04:41,922 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - 50% complete
2013-09-20 20:04:47,490 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - 100% complete
2013-09-20 20:04:47,492 [main] INFO  org.apache.pig.tools.pigstats.SimplePigStats - Script Statistics:

HadoopVersion   PigVersion      UserId  StartedAt       FinishedAt      Features
2.0.0-cdh4.3.0  0.11.0-cdh4.3.0 hanadmin        2013-09-20 20:04:28     2013-09-20 20:04:47     UNKNOWN

Success!

Job Stats (time in seconds):
JobId   Maps    Reduces MaxMapTime      MinMapTIme      AvgMapTime      MedianMapTime   MaxReduceTime   MinReduceTime   AvgReduceTime   MedianReducetime    Alias   Feature Outputs
job_201309061431_0266   1       0       5       5       5       5       0       0       0       0       A,B     MAP_ONLY        /tmp/pow_output,

Input(s):
Successfully read 2 records (388 bytes) from: "/tmp/pow_input.txt"

Output(s):
Successfully stored 2 records (12 bytes) in: "/tmp/pow_output"

Counters:
Total records written : 2
Total bytes written : 12
Spillable Memory Manager spill count : 0
Total bags proactively spilled: 0
Total records proactively spilled: 0

Job DAG:
job_201309061431_0266


2013-09-20 20:04:47,499 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - Success!

$ hadoop fs -cat /tmp/pow_output/part-m-00000
2       3       8
3       2       9