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https://issues.apache.org/jira/browse/HADOOP-9300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandy Ryza updated HADOOP-9300:
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Description:
In an effort to avoid overwriting user configs (MAPREDUCE-1888), StreamJob
doesn't set a job's output key/value classes unless they are specified in the
streaming command line. If the configs aren't specified in either of these
places, the streaming defaults (Text) no longer kick in, and the global default
LongWritable is used.
This can cause jobs/output writers that are expecting Text to fail.
was:When a hadoop streaming job is run with a java class as the reducer, or
no reducer specified (which defaults to IdentityReducer), the output key and
value classes are not set. This can cause a job to fail down the line.
> Streaming fails to set output key class when reducer is java class
> ------------------------------------------------------------------
>
> Key: HADOOP-9300
> URL: https://issues.apache.org/jira/browse/HADOOP-9300
> Project: Hadoop Common
> Issue Type: Bug
> Components: tools
> Affects Versions: 2.0.2-alpha
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
>
> In an effort to avoid overwriting user configs (MAPREDUCE-1888), StreamJob
> doesn't set a job's output key/value classes unless they are specified in the
> streaming command line. If the configs aren't specified in either of these
> places, the streaming defaults (Text) no longer kick in, and the global
> default LongWritable is used.
> This can cause jobs/output writers that are expecting Text to fail.
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