Transmit inputs to a map or reduce task sub-process.
Transmit outputs from a map or reduce task to parent.
Constructs and submits tether jobs.
Each language will provide a framework to permit easy implementation of MapReduce programs in that language. Currently only a Java framework has been implemented, for test purposes, so this feature is not yet useful.
This is still an experimental API, subject to change.
Copyright © 2009–2020 The Apache Software Foundation. All rights reserved.