The goal is a contrib module that builds Solr index using Hadoop MapReduce.
It is different from the Solr support in Nutch. The Solr support in Nutch sends a document to a Solr server in a reduce task. Here, the goal is to build/update Solr index within map/reduce tasks. Also, it achieves better parallelism when the number of map tasks is greater than the number of reduce tasks, which is usually the case.