If it is only for debugging,
http://wiki.apache.org/hadoop/Hive/DeveloperGuide#Debugging_Hive_code provide a
way to debug unit test in local mode.
On May 13, 2010, at 2:57 AM, Jeff Zhang wrote:
> Hi all,
>
> I'd like to debug hive program, and want to use the raw java api of
> Hive. I know that there's thrift api for hive, but it's not convenient
> for me especially for debugging and unit test.
> And I notice that the unit test (TestExecDriver) in hive use shim
> (call ExecDriver in another process) which is also not convenient for
> testing, I did some hacking and finally the following code can execute
> successfully ( I create the table before the execution). so I'd like
> to suggest maybe Hive should provide a more simple java api for
> user(wrapper based on the Hive internal Java api) and allow user to
> choose not using shim but directly using ExecDriver.
>
> ///////////////////////// code snippet
> ////////////////////////////////////////////////////////////////////////
> HiveConf conf = new HiveConf(ExecDriver.class);
> Driver driver = new Driver(conf);
> driver.compile("select name from test group by name");
> QueryPlan plan = Utilities.deserializeQueryPlan(new
> FileInputStream(driver.ctx
> .getLocalScratchDir().substring(5)
> + File.separator + "queryplan.xml"), conf);
> Task task=plan.getRootTasks().get(0);
> ExecDriver eDriver = new ExecDriver((MapredWork)task.getWork(),
> new JobConf(), false);
> eDriver.execute(new DriverContext());
>
> --
> Best Regards
>
> Jeff Zhang
