Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/95
@maropu
MapReduce context could be null when a job runs in a [uber/local
mode](https://stackoverflow.com/questions/30284237/what-is-the-purpose-of-uber-mode-in-hadoop).
Please use `RandomUtils.getUUID();` for ID generation. Throwing an
exception in `taskid()` UDF is expected behavior.
- BTW, `throw new HiveException(e.getMessage());` should be `throw new
HiveException(e);` to get the message and the root cause. Other parts as well.
- `createXGBooster` should not return null (add `@Nonnull` ) and should
throw Exception instead of suppressing to stderr.
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