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Posted to commits@lucene.apache.org by an...@apache.org on 2015/02/20 19:16:27 UTC
svn commit: r1661173 - in /lucene/cms/trunk/content: core/corenews.mdtext
mainnews.mdtext solr/news.mdtext
Author: anshum
Date: Fri Feb 20 18:16:27 2015
New Revision: 1661173
URL: http://svn.apache.org/r1661173
Log:
Adding NEWS content for Lucene and Solr 5.0 release
Modified:
lucene/cms/trunk/content/core/corenews.mdtext
lucene/cms/trunk/content/mainnews.mdtext
lucene/cms/trunk/content/solr/news.mdtext
Modified: lucene/cms/trunk/content/core/corenews.mdtext
URL: http://svn.apache.org/viewvc/lucene/cms/trunk/content/core/corenews.mdtext?rev=1661173&r1=1661172&r2=1661173&view=diff
==============================================================================
--- lucene/cms/trunk/content/core/corenews.mdtext (original)
+++ lucene/cms/trunk/content/core/corenews.mdtext Fri Feb 20 18:16:27 2015
@@ -1,5 +1,77 @@
# Lucene<span style="vertical-align: super; font-size: xx-small">TM</span> Core News
+## 20 February 2015 - Lucene⢠5.0.0 core available
+
+The Lucene PMC is pleased to announce the release of Apache Lucene 5.0.
+
+Apache Lucene is a high-performance, full-featured text search engine
+library written entirely in Java. It is a technology suitable for nearly
+any application that requires full-text search, especially cross-platform.
+
+This release contains numerous bug fixes, optimizations, and
+improvements, some of which are highlighted below. The release
+is available for immediate download at:
+http://lucene.apache.org/core/mirrors-core-latest-redir.html
+
+Lucene 5.0 Release Highlights:
+
+Stronger index safety
+
+* All file access now uses Javaâs NIO.2 APIs which give Lucene stronger index safety in terms of better error handling and safer commits.
+
+* Every Lucene segment now stores a unique id per-segment and per-commit to aid in accurate replication of index files.
+
+* During merging, IndexWriter now always checks the incoming segments for corruption before merging. This can mean, on upgrading to 5.0.0, that merging may uncover long-standing latent corruption in an older 4.x index.
+
+Reduced heap usage
+
+* Lucene now supports random-writable and advance-able sparse bitsets (RoaringDocIdSet and SparseFixedBitSet), so the heap required is in proportion to how many bits are set, not how many total documents exist in the index.
+
+* Heap usage during IndexWriter merging is also much lower with the new Lucene50Codec, since doc values and norms for the segments being merged are no longer fully loaded into heap for all fields; now they are loaded for the one field currently being merged, and then dropped.
+
+* The default norms format now uses sparse encoding when appropriate, so indices that enable norms for many sparse fields will see a large reduction in required heap at search time.
+
+* 5.0 has a new API to print a tree structure showing a recursive breakdown of which parts are using how much heap.
+
+Other features
+
+* FieldCache is gone (moved to a dedicated UninvertingReader in the misc module). This means when you intend to sort on a field, you should index that field using doc values, which is much faster and less heap consuming than FieldCache.
+
+* Tokenizers and Analyzers no longer require Reader on init.
+
+* NormsFormat now gets its own dedicated NormsConsumer/Producer
+
+* SortedSetSortField, used to sort on a multi-valued field, is promoted from sandbox to Lucene's core.
+
+* PostingsFormat now uses a "pull" API when writing postings, just like doc values. This is powerful because you can do things in your postings format that require making more than one pass through the postings such as iterating over all postings for each term to decide which compression format it should use.
+
+* New DateRangeField type enables Indexing and searching of date ranges, particularly multi-valued ones.
+
+* A new ExitableDirectoryReader extends FilterDirectoryReader and enables exiting requests that take too long to enumerate over terms.
+
+* Suggesters from multi-valued field can now be built as DocumentDictionary now enumerates each value separately in a multi-valued field.
+
+* ConcurrentMergeScheduler detects whether the index is on SSD or not and does a better job defaulting its settings. This only works on Linux for now; other OS's will continue to use the previous defaults (tuned for spinning disks).
+
+* Auto-IO-throttling has been added to ConcurrentMergeScheduler, to rate limit IO writes for each merge depending on incoming merge rate.
+
+* CustomAnalyzer has been added that allows to configure analyzers like you do in Solr's index schema. This class has a builder API to configure Tokenizers, TokenFilters, and CharFilters based on their SPI names and parameters as documented by the corresponding factories.
+
+* Memory index now supports payloads.
+
+* Added a filter cache with a usage tracking policy that caches filters based on frequency of use.
+
+* The default codec has an option to control BEST_SPEED or BEST_COMPRESSION for stored fields.
+
+* Stored fields are merged more efficiently, especially when upgrading from previous versions or using SortingMergePolicy
+
+NOTE: Lucene 5 no longer supports the Lucene 3.x index format. Opening indexes will result in IndexFormatTooOldException. It is recommended to either reindex all your data, or upgrade the old indexes with the IndexUpgrader tool of latest Lucene 4 version (4.10.x). Those indexes can then be read (see next section) with Lucene 5.
+
+To read more about the changes, also see: http://blog.mikemccandless.com/2014/11/apache-lucene-500-is-coming.html
+
+Please read CHANGES.txt (https://lucene.apache.org/core/5_0_0/changes/Changes.html) and MIGRATE.txt for a full list of new features and notes on upgrading.
+
+
## 29 December 2014 - Lucene Core 4.10.3 Available
The Lucene PMC is pleased to announce the release of Apache Lucene 4.10.3
@@ -338,105 +410,3 @@ with the release for a full list of deta
* Various bugfixes and optimizations since the 4.6.1 release.
-## 28 January 2014 - Lucene Core 4.6.1 Available
-
-The Lucene PMC is pleased to announce the release of Apache Lucene 4.6.1
-
-Apache Lucene is a high-performance, full-featured text search engine
-library written entirely in Java. It is a technology suitable for nearly
-any application that requires full-text search, especially cross-platform.
-
-This release contains a handful of bug fixes. The release
-is available for immediate download at:
- <http://lucene.apache.org/core/mirrors-core-latest-redir.html>
-
-See the [CHANGES.txt](/core/4_6_1/changes/Changes.html) file included
-with the release for a full list of details.
-
-## 24 November 2013 - Lucene Core 4.6 Available
-
-The Lucene PMC is pleased to announce the release of Apache Lucene 4.6
-
-Apache Lucene is a high-performance, full-featured text search engine
-library written entirely in Java. It is a technology suitable for nearly
-any application that requires full-text search, especially cross-platform.
-
-This release contains numerous bug fixes, optimizations, and
-improvements, some of which are highlighted below. The release
-is available for immediate download at:
- <http://lucene.apache.org/core/mirrors-core-latest-redir.html>
-
-See the [CHANGES.txt](/core/4_6_0/changes/Changes.html) file included
-with the release for a full list of details.
-
-### Lucene 4.6 Release Highlights:
-
-* Added support for NumericDocValues field updates (without re-indexing the document) through IndexWriter.updateNumericDocValue(Term, String, Long).
-
-* New FreeTextSuggester can predict the next word using a simple ngram language model useful for "long tail" suggestions.
-
-* A new expression module allows for customized ranking with script-like syntax.
-
-* A new DirectDocValuesFormat can hold all doc values in heap as uncompressed java native arrays.
-
-* Term.hasFreqs can now determine if a given field indexed per-doc term frequencies.
-
-* Various bugfixes and optimizations since the 4.5.1 release.
-
-## 24 October 2013 - Lucene Core 4.5.1 Available
-
-The Lucene PMC is pleased to announce the release of Apache Lucene 4.5.1
-
-Apache Lucene is a high-performance, full-featured text search engine
-library written entirely in Java. It is a technology suitable for nearly
-any application that requires full-text search, especially cross-platform.
-
-This release contains a handful of bug fixes. The release
-is available for immediate download at:
- <http://lucene.apache.org/core/mirrors-core-latest-redir.html>
-
-See the [CHANGES.txt](/core/4_5_1/changes/Changes.html) file included
-with the release for a full list of details.
-
-### Lucene 4.5.1 Release Highlights:
-
-- Lucene 4.5.1 includes 8 bug fixes.
-
-## 5 October 2013 - Lucene Core 4.5 Available
-
-The Lucene PMC is pleased to announce the release of Apache Lucene 4.5
-
-Apache Lucene is a high-performance, full-featured text search engine
-library written entirely in Java. It is a technology suitable for nearly
-any application that requires full-text search, especially cross-platform.
-
-This release contains numerous bug fixes, optimizations, and
-improvements, some of which are highlighted below. The release
-is available for immediate download at:
- <http://lucene.apache.org/core/mirrors-core-latest-redir.html>
-
-See the [CHANGES.txt](/core/4_5_0/changes/Changes.html) file included
-with the release for a full list of details.
-
-### Lucene 4.5 Release Highlights:
-
-* 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.
-
-* Various bugfixes and optimizations since the 4.4 release.
-
Modified: lucene/cms/trunk/content/mainnews.mdtext
URL: http://svn.apache.org/viewvc/lucene/cms/trunk/content/mainnews.mdtext?rev=1661173&r1=1661172&r2=1661173&view=diff
==============================================================================
--- lucene/cms/trunk/content/mainnews.mdtext (original)
+++ lucene/cms/trunk/content/mainnews.mdtext Fri Feb 20 18:16:27 2015
@@ -1,5 +1,113 @@
# Lucene<span style="vertical-align: super; font-size: xx-small">TM</span> News
+## 20 February 2015 -Apache Lucene 5.0.0 and Apache Solr 5.0.0 Available
+
+The Lucene PMC is pleased to announce the availability
+of Apache Lucene 5.0.0 and Apache Solr 5.0.0.
+
+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](/core/5_0_0/changes/Changes.html) and
+[Solr CHANGES.txt](/solr/5_0_0/changes/Changes.html) files included
+with the release for a full list of details.
+
+### Highlights of the Lucene release include:
+
+Stronger index safety
+* All file access now uses Javaâs NIO.2 APIs which give Lucene stronger index safety in terms of better error handling and safer commits.
+
+* Every Lucene segment now stores a unique id per-segment and per-commit to aid in accurate replication of index files.
+
+* During merging, IndexWriter now always checks the incoming segments for corruption before merging. This can mean, on upgrading to 5.0.0, that merging may uncover long-standing latent corruption in an older 4.x index.
+
+Reduced heap usage
+* Lucene now supports random-writable and advance-able sparse bitsets (RoaringDocIdSet and SparseFixedBitSet), so the heap required is in proportion to how many bits are set, not how many total documents exist in the index.
+
+* Heap usage during IndexWriter merging is also much lower with the new Lucene50Codec, since doc values and norms for the segments being merged are no longer fully loaded into heap for all fields; now they are loaded for the one field currently being merged, and then dropped.
+
+* The default norms format now uses sparse encoding when appropriate, so indices that enable norms for many sparse fields will see a large reduction in required heap at search time.
+
+* 5.0 has a new API to print a tree structure showing a recursive breakdown of which parts are using how much heap.
+
+Other features
+* FieldCache is gone (moved to a dedicated UninvertingReader in the misc module). This means when you intend to sort on a field, you should index that field using doc values, which is much faster and less heap consuming than FieldCache.
+
+* Tokenizers and Analyzers no longer require Reader on init.
+
+* NormsFormat now gets its own dedicated NormsConsumer/Producer
+
+* SortedSetSortField, used to sort on a multi-valued field, is promoted from sandbox to Lucene's core.
+
+* PostingsFormat now uses a "pull" API when writing postings, just like doc values. This is powerful because you can do things in your postings format that require making more than one pass through the postings such as iterating over all postings for each term to decide which compression format it should use.
+
+* New DateRangeField type enables Indexing and searching of date ranges, particularly multi-valued ones.
+
+* A new ExitableDirectoryReader extends FilterDirectoryReader and enables exiting requests that take too long to enumerate over terms.
+
+* Suggesters from multi-valued field can now be built as DocumentDictionary now enumerates each value separately in a multi-valued field.
+
+* ConcurrentMergeScheduler detects whether the index is on SSD or not and does a better job defaulting its settings. This only works on Linux for now; other OS's will continue to use the previous defaults (tuned for spinning disks).
+
+* Auto-IO-throttling has been added to ConcurrentMergeScheduler, to rate limit IO writes for each merge depending on incoming merge rate.
+
+* CustomAnalyzer has been added that allows to configure analyzers like you do in Solr's index schema. This class has a builder API to configure Tokenizers, TokenFilters, and CharFilters based on their SPI names and parameters as documented by the corresponding factories.
+
+* Memory index now supports payloads.
+
+* Added a filter cache with a usage tracking policy that caches filters based on frequency of use.
+
+* The default codec has an option to control BEST_SPEED or BEST_COMPRESSION for stored fields.
+
+* Stored fields are merged more efficiently, especially when upgrading from previous versions or using SortingMergePolicy
+
+### Highlights of the Solr release include:
+
+* Usability improvements that include improved bin scripts and new and restructured examples.
+
+* Scripts to support installing and running Solr as a service on Linux.
+
+* Distributed IDF is now supported and can be enabled via the config. Currently, there are four supported implementations for the same:
+** LocalStatsCache: Local document stats.
+** ExactStatsCache: One time use aggregation
+** ExactSharedStatsCache: Stats shared across requests
+** LRUStatsCache: Stats shared in an LRU cache across requests
+
+* Solr will no longer ship a war file and instead be a downloadable application.
+
+* SolrJ now has first class support for Collections API.
+
+* Implicit registration of replication,get and admin handlers.
+
+* Config API that supports paramsets for easily configuring solr parameters and configuring fields. This API also supports managing of pre-existing request handlers and editing common solrconfig.xml via overlay.
+
+* API for managing blobs allows uploading request handler jars and registering them via config API.
+
+* BALANCESHARDUNIQUE Collection API that allows for even distribution of custom replica properties.
+
+* There's now an option to not shuffle the nodeSet provided during collection creation.
+
+* Option to configure bandwidth usage by Replication handler to prevent it from using up all the bandwidth.
+
+* Splitting of clusterstate to per-collection enables scalability improvement in SolrCloud. This is also the default format for new Collections that would be created going forward.
+
+* timeAllowed is now used to prematurely terminate requests during query expansion and SolrClient request retry.
+
+* pivot.facet results can now include nested stats.field results constrained by those pivots.
+
+* stats.field can be used to generate stats over the results of arbitrary numeric functions.
+ It also allows for requesting for statistics for pivot facets using tags.
+
+* A new DateRangeField has been added for indexing date ranges, especially multi-valued ones.
+
+* Spatial fields that used to require units=degrees now take distanceUnits=degrees/kilometers miles instead.
+
+* MoreLikeThis query parser allows requesting for documents similar to an existing document and also works in SolrCloud mode.
+
+* Logging improvements:
+** Transaction log replay status is now logged
+** Optional logging of slow requests.
+
## 29 December 2014 - Apache Lucene 4.10.3 and Apache Solr 4.10.3 Available
The Lucene PMC is pleased to announce the availability
Modified: lucene/cms/trunk/content/solr/news.mdtext
URL: http://svn.apache.org/viewvc/lucene/cms/trunk/content/solr/news.mdtext?rev=1661173&r1=1661172&r2=1661173&view=diff
==============================================================================
--- lucene/cms/trunk/content/solr/news.mdtext (original)
+++ lucene/cms/trunk/content/solr/news.mdtext Fri Feb 20 18:16:27 2015
@@ -2,6 +2,81 @@ Title: News
# Solr<sup>™</sup> News
+## 20 February 2015 - Apache Solr⢠5.0.0 and Reference Guide for 5.0 available
+
+Solr is the popular, blazing fast, open source NoSQL search platform
+from the Apache Lucene project. Its major features include powerful
+full-text search, hit highlighting, faceted search, dynamic
+clustering, database integration, rich document (e.g., Word, PDF)
+handling, and geospatial search. Solr is highly scalable, providing
+fault tolerant distributed search and indexing, and powers the search
+and navigation features of many of the world's largest internet sites.
+
+Solr 5.0 is available for immediate download at:
+http://lucene.apache.org/solr/mirrors-solr-latest-redir.html
+
+See the CHANGES.txt file included with the release for a full list of
+details.
+
+Solr 5.0 Release Highlights:
+
+* Usability improvements that include improved bin scripts and new and restructured examples.
+
+* Scripts to support installing and running Solr as a service on Linux.
+
+* Distributed IDF is now supported and can be enabled via the config. Currently, there are four supported implementations for the same:
+
+** LocalStatsCache: Local document stats.
+** ExactStatsCache: One time use aggregation
+** ExactSharedStatsCache: Stats shared across requests
+** LRUStatsCache: Stats shared in an LRU cache across requests
+
+* Solr will no longer ship a war file and instead be a downloadable application.
+
+* SolrJ now has first class support for Collections API.
+
+* Implicit registration of replication,get and admin handlers.
+
+* Config API that supports paramsets for easily configuring solr parameters and configuring fields. This API also supports managing of pre-existing request handlers and editing common solrconfig.xml via overlay.
+
+* API for managing blobs allows uploading request handler jars and registering them via config API.
+
+* BALANCESHARDUNIQUE Collection API that allows for even distribution of custom replica properties.
+
+* There's now an option to not shuffle the nodeSet provided during collection creation.
+
+* Option to configure bandwidth usage by Replication handler to prevent it from using up all the bandwidth.
+
+* Splitting of clusterstate to per-collection enables scalability improvement in SolrCloud. This is also the default format for new Collections that would be created going forward.
+
+* timeAllowed is now used to prematurely terminate requests during query expansion and SolrClient request retry.
+
+* pivot.facet results can now include nested stats.field results constrained by those pivots.
+
+* stats.field can be used to generate stats over the results of arbitrary numeric functions.
+ It also allows for requesting for statistics for pivot facets using tags.
+
+* A new DateRangeField has been added for indexing date ranges, especially multi-valued ones.
+
+* Spatial fields that used to require units=degrees now take distanceUnits=degrees/kilometers miles instead.
+
+* MoreLikeThis query parser allows requesting for documents similar to an existing document and also works in SolrCloud mode.
+
+* Logging improvements:
+** Transaction log replay status is now logged
+** Optional logging of slow requests.
+
+Solr 5.0 also includes many other new features as well as numerous
+optimizations and bugfixes of the corresponding Apache Lucene release.
+
+Detailed change log:
+http://lucene.apache.org/solr/5_0_0/changes/Changes.html
+
+Also available is the Solr Reference Guide for Solr 5.0. This 535 page
+PDF serves as the definitive user's manual for Solr 5.0. It can be downloaded
+from the Apache mirror network: https://s.apache.org/Solr-Ref-Guide-PDF
+
+
## 29 December 2014 - Apache Solr 4.10.3 Available
The Lucene PMC is pleased to announce the release of Apache Solr 4.10.3
@@ -451,126 +526,3 @@ file included with the release for a ful
Solr 4.7 also includes many other new features as well as numerous
optimizations and bugfixes.
-
-## 28 January 2014 - Apache Solr 4.6.1 Available
-
-The Lucene PMC is pleased to announce the release of Apache Solr 4.6.1
-
-Solr is the popular, blazing fast, open source NoSQL search platform
-from the Apache Lucene project. Its major features include powerful
-full-text search, hit highlighting, faceted search, dynamic
-clustering, database integration, rich document (e.g., Word, PDF)
-handling, and geospatial search. Solr is highly scalable, providing
-fault tolerant distributed search and indexing, and powers the search
-and navigation features of many of the world's largest internet sites.
-
-Solr 4.6.1 contains nearly 30 bug fixes. The release is available for
- immediate download at: <http://lucene.apache.org/solr/mirrors-solr-latest-redir.html>
-
-See the [CHANGES.txt](/solr/4_6_1/changes/Changes.html) file included
-with the release for a full list of details.
-
-## 2 December 2013 - Apache Solr Reference Guide 4.6
-
-The Lucene PMC is pleased to announce the release of the Apache Solr Reference Guide for Solr 4.6.
-
-This 347 page PDF serves as the definitive users manual for Solr 4.6.
-
-The Solr Reference Guide is available for download from the [Apache mirror network](https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/).
-
-## 24 November 2013 - Apache Solr 4.6 Available
-
-The Lucene PMC is pleased to announce the release of
-Apache Solr 4.6
-
-Solr is the popular, blazing fast, open source NoSQL search platform
-from the Apache Lucene project. Its major features include powerful
-full-text search, hit highlighting, faceted search, dynamic
-clustering, database integration, rich document (e.g., Word, PDF)
-handling, and geospatial search. Solr is highly scalable, providing
-fault tolerant distributed search and indexing, and powers the search
-and navigation features of many of the world's largest internet sites.
-
-Solr 4.6 is available for immediate download at:
-<http://lucene.apache.org/solr/mirrors-solr-latest-redir.html>
-
-See the [CHANGES.txt](/solr/4_6_0/changes/Changes.html)
-file included with the release for a full list of details.
-
-### Solr 4.6 Release Highlights:
-
-* Many improvements and enhancements for shard splitting options
-* New AnalyzingInfixLookupFactory to leverage the AnalyzingInfixSuggester
-* New CollapsingQParserPlugin for high performance field collapsing on high
- cardinality fields
-* New SolrJ APIs for collection management
-* New DocBasedVersionConstraintsProcessorFactory providing support for user
- configured doc-centric versioning rules
-* New default index format: Lucene46Codec
-* New EnumField type
-
-Solr 4.6 also includes many other new features as well as numerous
- optimizations and bugfixes.
-
-
-## 24 October 2013 - Apache Solr 4.5.1 Available
-
-The Lucene PMC is pleased to announce the release of Apache Solr 4.5.1
-
-Solr is the popular, blazing fast, open source NoSQL search platform
-from the Apache Lucene project. Its major features include powerful
-full-text search, hit highlighting, faceted search, dynamic
-clustering, database integration, rich document (e.g., Word, PDF)
-handling, and geospatial search. Solr is highly scalable, providing
-fault tolerant distributed search and indexing, and powers the search
-and navigation features of many of the world's largest internet sites.
-
-Solr 4.5.1 contains a handful of bug fixes, including 2 that are considered
-quite severe. The release is available for immediate download at:
-<http://lucene.apache.org/solr/mirrors-solr-latest-redir.html>
-
-See the [CHANGES.txt](/solr/4_5_1/changes/Changes.html) file included
-with the release for a full list of details.
-
-## 5 October 2013 - Apache Solr 4.5 and Apache Solr Reference Guide 4.5 Available
-
-The Lucene PMC is pleased to announce the release of
-Apache Solr 4.5 and the Apache Solr Reference Guide 4.5
-
-Solr is the popular, blazing fast, open source NoSQL search
-platform from the Apache Lucene project. Its major features
-include powerful full-text search, hit highlighting, faceted
-search, dynamic clustering, database integration, rich document
-(e.g., Word, PDF) handling, and geospatial search. Solr is highly
-scalable, providing fault tolerant distributed search and indexing,
-and powers the search and navigation features of many of the
-world's largest internet sites.
-
-Solr 4.5 is available for immediate download at:
-<http://lucene.apache.org/solr/mirrors-solr-latest-redir.html>
-
-See the [CHANGES.txt](/solr/4_5_0/changes/Changes.html)
-file included with the release for a full list of details.
-
-The Solr Reference Guide, a 338 page PDF that serves as the
-definitive users manual for Solr 4.5, is available for download
-from the Apache mirror network:
-
-<https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/>
-
-### Solr 4.5 Release Highlights:
-
-* Custom sharding support, including the ability to shard by field.
-* DocValue improvements: single valued fields no longer require a
- default value, allowing 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 many other new features as well as numerous
- optimizations and bugfixes.
-
-
- [1]: https://www.apache.org/dyn/closer.cgi/lucene/solr/ref-guide/