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Hive >> mail # user >> Where is exception stacktrace and root cause for UDF


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Marc Limotte 2013-03-20, 20:01
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Re: Where is exception stacktrace and root cause for UDF
They should be viewable if you enable the DEBUG mode.

hive -hiveconf hive.root.logger=DEBUG,console

On Thu, Mar 21, 2013 at 1:31 AM, Marc Limotte <[EMAIL PROTECTED]> wrote:
> Hi.
>
> I'm trying to understand what happens to Exceptions that are thrown by
> custom UDFs.  I have a UDF that throws a RuntimeException with useful
> debugging information, but I don't see it in any logs.  I'm running my
> commands using the hive cli (Hive 0.9.0).  Instead I see:
>
>> FAILED: Error in semantic analysis: Line 3:7 Wrong arguments '600':
>> org.apache.hadoop.hive.ql.metadata.HiveException: Unable to execute method …
>> evaluate(...) on object ...
>> Command exited with non-zero status 10
>
>
> Despite the "semantic analysis" error, I know it's getting to the
> evaluate(…) method because of other log messages.
>
> Looking in org.apache.hadoop.hive.ql.exec.FunctionRegistry, I find the
> invoke method, which contains:
>
>  public static Object invoke(Method m, Object thisObject, Object...
> arguments)
>       throws HiveException {
>     Object o;
>     try {
>       o = m.invoke(thisObject, arguments);
>     } catch (Exception e) {
>       ...
>       throw new HiveException("Unable to execute method " + m + " "
>           + " on object " + thisObjectString + " with arguments "
>           + argumentString.toString(), e);
>     }
>     return o;
>   }
>
> So it appears that my RuntimeException is wrapped in HiveException.  But
> then it looks like only the Exception message is printed by the hive cli.
> Does the stack trace and root cause get printed in some log?  I didn't find
> it anywhere.
>
>
> Marc
>

--
Harsh J
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FangKun Cao 2013-03-21, 08:16
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB