Red lines: Solr
A quick check of Google Trends shows that Apache Solr (the search server based on Lucene) and Hadoop (the open-source implementation of MapReduce) are popular query terms -- and becoming more popular by the day. (For links to the news stories labelled with flags 'A', 'B', 'C', etc., go to this Google Trends page.)
Likewise: Job trend data from Indeed.com leaves little doubt that Hadoop and Solr skills are increasingly in demand:
Bottom line? If you're a developer, enrichening your Hadoop and/or Lucene+Solr skills can only be considered a good investment.
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