Lucene is a search library. It was first developed by Doug
Cutting and named after his wife. Later, he contributed it to the
Apache Software Foundation, and since it has had lots of
contributors.
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There are a long list of features that Apache Lucene offers its
patrons. It offers fixes, faceting, scalability and many more
things that anyone interested in working this area would
appreciate.
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Yes and No, it depends on your data size and index
structure.
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Solr is an open source search server which uses the Lucene search library. Both are written in Java and under the Apache Software License.
More information about Solr can be found at solr-1