FAQ Sqoop2 Integration tests

WORK IN PROGRESS

Some of the well known quirks for the Sqoop2 integration test suite is documented here so that developers can be aware of what to expect when running

How To run integration tests?

We recommend not running integration tests from your IDE - there can be some strange and unexpected errors there.

Use command line to run the tests:

mvn clean integration-test

to run a specific test:

mvn -Dtest=org.apache.sqoop.integration.connector.kafka.FromRDBMSToKafkaTest -DfailIfNoTests=false verify

to run with local mapreduce (faster and theoretically you should be able to attach a debugger)

But there may be some quirks with HadoopLocalRunner and is not always recommended

mvn -Dsqoop.hadoop.runner.class=org.apache.sqoop.test.hadoop.HadoopLocalRunner -Dtest=org.apache.sqoop.integration.connector.kafka.FromRDBMSToKafkaTest -DfailIfNoTests=false verify

How does the integration test suite work?

They use the Hadoop Minicluster behind the scenes. to simulate the MR execution engine environment

What DB does integration tests use today for storing the Sqoop entities ?

By default it is embedded Derby

public class DerbyProvider extends DatabaseProvider {
  @Override
  public void start() {
    // Start embedded server
    try {
      port = NetworkUtils.findAvailablePort();
      LOG.info("Will bind to port " + port);
      server = new NetworkServerControl(InetAddress.getByName("localhost"), port);
      server.start(new LoggerWriter(LOG, Level.INFO));
      // Start won't thrown an exception in case that it fails to start, one
      // have to explicitly call ping() in order to verify if the server is
      // up. Check DERBY-1465 for more details.
      server.ping();
    } catch (Exception e) {
      LOG.error("Can't start Derby network server", e);
      throw new RuntimeException("Can't derby server", e);
    }
    super.start();
  }

NOTE: Even though there are other providers such as MySQLProvider and PostgreSQLProvider, they are not used in any of the tests.

What are the datasets we use in some of the integration tests ?

Anything that extends the following base class

public abstract class DataSet { ..}

Where to look for MR Job related logs in the integration tests?

Look under /test/target under your source folder. Inside each of the MiniMRCluster_XXXX folders there will sub folders and logs.

/path/to/sqoop2/test/target/MiniMRCluster_96106422

MiniMRCluster_96106422-localDir-nm-0_0	MiniMRCluster_96106422-localDir-nm-0_2	MiniMRCluster_96106422-logDir-nm-0_0	MiniMRCluster_96106422-logDir-nm-0_2

MiniMRCluster_96106422-localDir-nm-0_1	MiniMRCluster_96106422-localDir-nm-0_3	MiniMRCluster_96106422-logDir-nm-0_1	MiniMRCluster_96106422-logDir-nm-0_3

What happens when integration tests are abruptly terminated due to CTRL + C or failures?

Please look for zombie java processes and kill them all before running the integration tests. Currently the cluster does not cleanly shutdown.

If zombie java exists, please kill them before starting integration tests next time, because these zombie java processes will hold the ports (such as 12000, 8080, 1527) and the following integration test could not obtain these ports. Then the following integration test will be stuck.

ps -ef | grep java
killall -9 java
 
or more advanced....
for p in `ps aux | grep java | grep YarnChild| sed -re "s/<username> ([0-9]+) ./\1/"`; do echo $p; kill -9 $p;  done

Some related tickets that is in place to fix some of these quirks

SQOOP-1840 - DerbyProvider quirks,
SQOOP-1844 -
SQOOP-1832
SQOOP-1831 - MR file names now logged

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