glad...@gmail.com created MAPREDUCE-4897:
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Summary: Using both MultipleInputs.addInputPath methods causes
mappers to fail
Key: MAPREDUCE-4897
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4897
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 0.20.2
Reporter: glad...@gmail.com
The MultipleInputs class has two methods for adding inputs, one takes a mapper
for the provided input path. When using both, both the inputformat gets set to
DelegatingInputFormat class and the mapper class gets set to the
DelegatingMapperClass.
When running a map task, the delegating input sees theres no mapper for the
provided input path, and the next step is to get the mapper from the jobconf
(which usually defaults to the identity mapper). However, because I used both
methods in the MultipleInputs class, the mapper in the jobconf is set to the
DelegatingMapper. Thus the delegating mapper creates a delegating mapper and
tries its map method. (this is how the framework gets the delegating mapper to
use a provided mapper). And the map method sees no mapper created yet, creates
a new delegating mapper, uses it, which see no mapper created yet, creates a
delegating mapper, etc.
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