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https://issues.apache.org/jira/browse/PIG-1404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Work on PIG-1404 started by Romain Rigaux.
> PigUnit - Pig script testing simplified.
> -----------------------------------------
>
> Key: PIG-1404
> URL: https://issues.apache.org/jira/browse/PIG-1404
> Project: Pig
> Issue Type: New Feature
> Reporter: Romain Rigaux
> Assignee: Romain Rigaux
> Fix For: 0.8.0
>
> Attachments: commons-lang-2.4.jar, PIG-1404-2.patch,
> PIG-1404-3-doc.patch, PIG-1404-3.patch, PIG-1404-4-doc.patch,
> PIG-1404-4.patch, PIG-1404.patch
>
>
> The goal is to provide a simple xUnit framework that enables our Pig scripts
> to be easily:
> - unit tested
> - regression tested
> - quickly prototyped
> No cluster set up is required.
> For example:
> TestCase
> {code}
> @Test
> public void testTop3Queries() {
> String[] args = {
> "n=3",
> };
> test = new PigTest("top_queries.pig", args);
> String[] input = {
> "yahoo\t10",
> "twitter\t7",
> "facebook\t10",
> "yahoo\t15",
> "facebook\t5",
> ....
> };
> String[] output = {
> "(yahoo,25L)",
> "(facebook,15L)",
> "(twitter,7L)",
> };
> test.assertOutput("data", input, "queries_limit", output);
> }
> {code}
> top_queries.pig
> {code}
> data =
> LOAD '$input'
> AS (query:CHARARRAY, count:INT);
>
> ...
>
> queries_sum =
> FOREACH queries_group
> GENERATE
> group AS query,
> SUM(queries.count) AS count;
>
> ...
>
> queries_limit = LIMIT queries_ordered $n;
> STORE queries_limit INTO '$output';
> {code}
> They are 3 modes:
> * LOCAL (if "pigunit.exectype.local" properties is present)
> * MAPREDUCE (use the cluster specified in the classpath, same as
> HADOOP_CONF_DIR)
> ** automatic mini cluster (is the default and the HADOOP_CONF_DIR to have in
> the class path will be: ~/pigtest/conf)
> ** pointing to an existing cluster (if "pigunit.exectype.cluster" properties
> is present)
> For now, it would be nice to see how this idea could be integrated in
> Piggybank and if PigParser/PigServer could improve their interfaces in order
> to make PigUnit simple.
> Other components based on PigUnit could be built later:
> - standalone MiniCluster
> - notion of workspaces for each test
> - standalone utility that reads test configuration and generates a test
> report...
> It is a first prototype, open to suggestions and can definitely take
> advantage of feedbacks.
> How to test, in pig_trunk:
> {code}
> Apply patch
> $pig_trunk ant compile-test
> $pig_trunk ant
> $pig_trunk/contrib/piggybank/java ant test -Dtest.timeout=999999
> {code}
> (it takes 15 min in MAPREDUCE minicluster, tests will need to be split in the
> future between 'unit' and 'integration')
> Many examples are in:
> {code}
> contrib/piggybank/java/src/test/java/org/apache/pig/piggybank/test/pigunit/TestPigTest.java
> {code}
> When used as a standalone, do not forget commons-lang-2.4.jar and the
> HADOOP_CONF_DIR to your cluster in your CLASSPATH.
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