Fixes and enhancements from Lucene 3.5.0, most notably the substantial reduction of memory needed for holding the term index.
The major changes for the Solr 3.5.0 release are:
#APACHE LUCENE SOLR FULL#
To see the full list of changes in Lucene 3.5, please visit the Lucene 3.5 Release Notes. This can speed up queries 30-50% when n-gram analysis is used. NGramPhraseQuery is a PhraseQuery which is optimized for n-gram phrase queries.
This method is typically less costly than opening a new IndexReader. IndexReader.openIfChanged returns null if there are no changes in the index. IndexWriter.reopen has been replaced by openIfChanged. This is to discourage the use of this method since it is a very costly operation and only justified if the index is static. IndexWriter.optimize has been deprecated and renamed to forceMerge. It simplifies the usage of the same IndexSearcher instance between requests, which provides a better user experience when paging or drilling down/up on search results. The .SearcherLifetimeManager class has been added to provide a consistent view of the index across multiple requests. The acquire method is used to retrieve an IndexSearcher and the release method is used to close the retrieved IndexSearcher. Underlying IndexReader instances are safely closed if not referenced anymore, using the IndexReader's reference counts. The .SearcherManager class has been added to simplify the sharing and reopening of IndexSearcher across multiple search threads. You can pass the last document on the previous page to the searchAfter method to get to the next page of results. Added archAfter which returns results after a specified ScoreDoc. This has been achieved by creating a more memory efficient data structure for holding terms. There is a substantial reduction (3-5X) of memory needed to hold the terms index. The major changes for the Lucene 3.5.0 release are: Solr is a standalone search server that uses Lucene at its core for indexing and search. Lucene is a high-performance, full-featured text search library. The Lucene PMC (Project Management Committee) has announced the availability of Apache Lucene 3.5.0 and Apache Solr 3.5.0.
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