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https://issues.apache.org/jira/browse/MRUNIT-131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428686#comment-13428686
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Dave Beech commented on MRUNIT-131:
-----------------------------------
If the user hasn't explicitly set one when setting up the driver, we should use
JobConf's getOutputKeyComparator to get the comparator to use during the
shuffle. This method contains the logic to decide which comparator to use;
either from a config parameter, a registered one if present, or fallback to
default WritableComparator.
> Comparators registered using WritableComparator.define are not used during
> tests
> --------------------------------------------------------------------------------
>
> Key: MRUNIT-131
> URL: https://issues.apache.org/jira/browse/MRUNIT-131
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Dave Beech
> Assignee: Dave Beech
> Fix For: 1.0.0
>
>
> The comparator to use for sorting map outputs can be set in Hadoop using
> WritableComparator.define(MyWritable.class, new MyComparator());
> However these comparators are not recognised by MRUnit and are not used by
> MapReduceDriver tests.
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