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From "Jason Dere (JIRA)" <>
Subject [jira] [Commented] (HIVE-9073) NPE when using custom windowing UDAFs
Date Wed, 10 Dec 2014 22:59:15 GMT


Jason Dere commented on HIVE-9073:

Looks like the error may be occurring because the Hive is trying to look up the UDF by name
during the UDF initialization in the reduce task. Ideally this lookup should only be happening
during the compilation phase and not during the map/reduce tasks.  This looks like it works
ok for built-in windowing UDFs (added to the FunctionRegistry), but custom UDFs are hitting
some other logic that really should only happen during compilation. We would have to fix the
way WindowingTableFunction is doing its initialization for this to work with UDFs added with

> NPE when using custom windowing UDAFs
> -------------------------------------
>                 Key: HIVE-9073
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: UDF
>            Reporter: Jason Dere
>            Assignee: Jason Dere
> From the hive-user email group:
> {noformat}
> While executing a simple select query using a custom windowing UDAF I created I am constantly
running into this error.
> Error: java.lang.RuntimeException: Error in configuring object
>         at org.apache.hadoop.util.ReflectionUtils.setJobConf(
>         at org.apache.hadoop.util.ReflectionUtils.setConf(
>         at org.apache.hadoop.util.ReflectionUtils.newInstance(
>         at org.apache.hadoop.mapred.ReduceTask.runOldReducer(
>         at
>         at org.apache.hadoop.mapred.YarnChild$
>         at Method)
>         at
>         at
>         at org.apache.hadoop.mapred.YarnChild.main(
> Caused by: java.lang.reflect.InvocationTargetException
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(
>         at java.lang.reflect.Method.invoke(
>         at org.apache.hadoop.util.ReflectionUtils.setJobConf(
>         ... 9 more
> Caused by: java.lang.RuntimeException: Reduce operator initialization failed
>         at
>         ... 14 more
> Caused by: java.lang.NullPointerException
>         at org.apache.hadoop.hive.ql.exec.FunctionRegistry.getFunctionInfo(
>         at org.apache.hadoop.hive.ql.exec.FunctionRegistry.getWindowFunctionInfo(
>         at org.apache.hadoop.hive.ql.udf.ptf.WindowingTableFunction.streamingPossible(
>         at org.apache.hadoop.hive.ql.udf.ptf.WindowingTableFunction.setCanAcceptInputAsStream(
>         at org.apache.hadoop.hive.ql.udf.ptf.WindowingTableFunction.initializeStreaming(
>         at org.apache.hadoop.hive.ql.exec.PTFOperator$PTFInvocation.initializeStreaming(
>         at org.apache.hadoop.hive.ql.exec.PTFOperator.initializeOp(
>         at org.apache.hadoop.hive.ql.exec.Operator.initialize(
>         at org.apache.hadoop.hive.ql.exec.Operator.initialize(
>         at org.apache.hadoop.hive.ql.exec.Operator.initializeChildren(
>         at org.apache.hadoop.hive.ql.exec.ExtractOperator.initializeOp(
>         at org.apache.hadoop.hive.ql.exec.Operator.initialize(
>         at
>         ... 14 more
> Just wanted to check if any of you have faced this earlier. Also when I try to run the
Custom UDAF on another server it works fine. The only difference I can see it that the hive
version I am using on my local machine is 0.13.1 where it is working and on the other machine
it is 0.13.0 where I see the above mentioned error. I am not sure if this was a bug which
was fixed in the later release but I just wanted to confirm the same.
> {noformat}

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