From: Apache Lucene News:
The Lucene PMC is pleased to announce the availability
of Apache Lucene 4.5 and Apache Solr 4.5.Lucene can be downloaded from http://lucene.apache.org/core/mirrors-core-latest-redir.html and Solr can be downloaded from http://lucene.apache.org/solr/mirrors-solr-latest-redir.html
See the Lucene CHANGES.txt and Solr CHANGES.txt files included with the release for a full list of details.
Highlights of the Lucene release include:
- Added support for missing values to DocValues fields through AtomicReader.getDocsWithField.
- Lucene 4.5 has a new Lucene45Codec with Lucene45DocValues, supporting missing values and with most datastructures residing off-heap.
- New in-memory DocIdSet implementations which are especially better than FixedBitSet on small sets: WAH8DocIdSet, PFORDeltaDocIdSet and EliasFanoDocIdSet.
- CachingWrapperFilter now caches filters with WAH8DocIdSet by default, which has the same memory usage as FixedBitSet in the worst case but is smaller and faster on small sets.
- TokenStreams now set the position increment in end(), so we can handle trailing holes.
- IndexWriter no longer clones the given IndexWriterConfig.
Lucene 4.5 also includes numerous optimizations and bugfixes.
Highlights of the Solr release include:
- Custom sharding support, including the ability to shard by field.
- DocValue improvements: single valued fields no longer require a default value, allowiing dynamicFields to contain doc values, as well as sortMissingFirst and sortMissingLast on docValue fields.
- Ability to store solr.xml in ZooKeeper.
- Multithreaded faceting.
- CloudSolrServer can now route updates directly to the appropriate shard leader.
Solr 4.5 also includes numerous optimizations and bugfixes.
Excellent!
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