Benjamin Reed wrote:
Using the compareTo method is just the default. We can define our own WritetableComparator subclass to hook into the Hadoop sorting.
You can either register it in WritableComparator (though this is less flexible - the comparator will be used in every case, no matter what job runs in the JVM), or set it specifically on a per-job basis using JobConf.setOutputKeyComparatorClass().
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