title: What types of tasks / applications can use Apache Hadoop for (MapReduce functions)
body: <p>I don't understand what types of apps can be used with Hadoop.  Does each task have to be tailored for hadoop/mapreduce.  For example, can you just associate any long running java processed with it?  Or do you specifically have to tailor your app/task for hadoop.  I guess a good example would be using lucene and hadoop for indexing.</p>