Todd Lipcon created MAPREDUCE-5974:
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Summary: Allow map output collector fallback
Key: MAPREDUCE-5974
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5974
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Components: task
Affects Versions: 2.6.0
Reporter: Todd Lipcon
Currently we only allow specifying a single MapOutputCollector implementation
class in a job. It would be nice to allow a comma-separated list of classes: we
should try each collector implementation in the user-specified order until we
find one that can be successfully instantiated and initted.
This is useful for cases where a particular optimized collector implementation
cannot operate on all key/value types, or requires native code. The cluster
administrator can configure the cluster to try to use the optimized collector
and fall back to the default collector.
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