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POIntegration testing Hive jobs
 

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    <p>I'm trying to write a non-trivial Hive job using the Hive Thrift and JDBC interfaces, and I'm having trouble setting up a decent JUnit test. By non-trivial, I mean that the job results in at least one MapReduce stage, as opposed to only dealing with the metastore.</p> <p>The test should fire up a Hive server, load some data into a table, run some non-trivial query on that table, and check the results.</p> <p>I've wired up a Spring context according to the <a href="http://static.springsource.org/spring-hadoop/docs/1.0.0.RELEASE/reference/html/hive.html" rel="noreferrer" title="Spring Hive context">Spring reference</a>. However, the job fails on the MapReduce phase, complaining that no Hadoop binary exists:</p> <blockquote> <p>java.io.IOException: Cannot run program "/usr/bin/hadoop" (in directory "/Users/yoni/opower/workspace/intellij_project_root"): error=2, No such file or directory</p> </blockquote> <p>The problem is that the Hive Server is running in-memory, but relies upon local installation of Hive in order to run. For my project to be self-contained, I need the Hive services to be embedded, including the HDFS and MapReduce clusters. I've tried starting up a Hive server using the same Spring method and pointing it at <a href="http://javasourcecode.org/html/open-source/hadoop/hadoop-0.20.203.0/org/apache/hadoop/hdfs/MiniDFSCluster.html" rel="noreferrer">MiniDFSCluster</a> and <a href="http://javasourcecode.org/html/open-source/hadoop/hadoop-0.20.2/org/apache/hadoop/mapred/MiniMRCluster.html" rel="noreferrer">MiniMRCluster</a>, similar to the pattern used in the Hive <a href="http://hive.apache.org/docs/r0.9.0/api/org/apache/hadoop/hive/ql/QTestUtil.html" rel="noreferrer">QTestUtil</a> source and in <a href="http://people.apache.org/~psmith/hbase/sandbox/hbase/hbase-core/testapidocs/org/apache/hadoop/hbase/HBaseTestingUtility.html" rel="noreferrer">HBaseTestUtility</a>. However, I've not been able to get that to work.</p> <p>After three days of trying to wrangle Hive integration testing, I thought I'd ask the community: </p> <ol> <li>How do you recommend I integration test Hive jobs?</li> <li>Do you have a working JUnit example for integration testing Hive jobs using in-memory HDFS, MR, and Hive instances?</li> </ol> <p>Additional resources I've looked at:</p> <ul> <li><a href="http://dev.bizo.com/2011/04/hive-unit-testing.html" rel="noreferrer" title="Unit testing Hive">Hive Unit Testing tutorial</a></li> <li><a href="https://github.com/SpringSource/spring-hadoop-samples/tree/master/samples/hive" rel="noreferrer" title="Spring Hive example">the Spring Hive example</a></li> </ul> <p>Edit: I am fully aware that working against a Hadoop cluster - whether local or remote - makes it possible to run integration tests against a full-stack Hive instance. The problem, as stated, is that this is not a viable solution for effectively testing Hive workflows.</p>
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    1. COSince it's looking for an installation, why not create a RAM disk that you can point it to? Other than that, you'll have to start examining the source to see how it uses the configuration you provide it. Then you can write your own glue to bypass the config, and run the features directly.
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