Is there a way to keep a map-task alive after it has finished its work, to
later perform another task on its same input?
For example, consider the k-means clustering algorithm (k-means
description<http://en.wikipedia.org/wiki/K-means_clustering>and hadoop
The only thing changing between iterations is the clusters centers. All the
input points remain the same. Keeping the mapper alive, and performing the
next round of map-tasks on the same node will save a lot of communication

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