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From Péter Király <>
Subject Re: [ANNOUNCE] Apache Solr 4.0 released.
Date Fri, 12 Oct 2012 15:07:02 GMT
I would like to thank you all who participated in this!

Thank you very much!

2012/10/12 Robert Muir <>:
> October 12 2012, Apache Solr™ 4.0 available.
> The Lucene PMC is pleased to announce the release of Apache Solr 4.0.
> 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
> searchand navigation features of many of the world's largest internet
> sites.
> Solr 4.0 is available for immediate download at:
> See the CHANGES.txt file included with the release for a full list of details.
> Solr 4.0 Release Highlights:
> The largest set of features goes by the development code-name
> "SolrCloud" and involves bringing easy scalability to Solr.  See
> for more details.
> * Distributed indexing designed from the ground up for near real-time
> (NRT) and NoSQL features such as realtime-get, optimistic locking, and
> durable updates.
> * High availability with no single points of failure.
> * Apache Zookeeper integration for distributed coordination and
> cluster metadata and configuration storage.
> * Immunity to split-brain issues due to Zookeeper's Paxos distributed
> consensus protocols.
> * Updates sent to any node in the cluster and are automatically
> forwarded to the correct shard and replicated to multiple nodes for
> redundancy.
> * Queries sent to any node automatically perform a full distributed
> search across the cluster with load balancing and fail-over.
> * A collection management API.
> * Smart SolrJ client (CloudSolrServer) that knows to send documents
> only to the shard leaders
> Solr 4.0 includes more NoSQL features for those using Solr as a
> primary data store:
> * Update durability – A transaction log ensures that even uncommitted
> documents are never lost.
> * Real-time Get – The ability to quickly retrieve the latest version
> of a document, without the need to commit or open a new searcher
> * Versioning and Optimistic Locking – combined with real-time get,
> this allows read-update-write functionality that ensures no
> conflicting changes were made concurrently by other clients.
> * Atomic updates - the ability to add, remove, change, and increment
> fields of an existing document without having to send in the complete
> document again.
> Many additional improvements include:
> * New spatial field types with polygon support.
> * Pivot Faceting – Multi-level or hierarchical faceting where the top
> constraints for one field are found for each top constraint of a
> different field.
> * Pseudo-fields – The ability to alias fields, or to add metadata
> along with returned documents, such as function query values and
> results of spatial distance calculations.
> * A spell checker implementation that can work directly from the main
> index instead of creating a sidecar index.
> * Pseudo-Join functionality – The ability to select a set of documents
> based on their relationship to a second set of documents.
> * Function query enhancements including conditional function queries
> and relevancy functions.
> * New update processors to facilitate modifying documents prior to indexing.
> * A brand new web admin interface, including support for SolrCloud and
> improved error reporting
> * Numerous bug fixes and optimizations.
> Noteworthy changes since 4.0-BETA:
> * New spatial field types with polygon support.
> * Various Admin UI improvements.
> * SolrCloud related performance optimizations in writing the
> transaction log, PeerSync recovery, Leader election, and ClusterState
> caching.
> * Numerous bug fixes and optimizations.
> Please report any feedback to the mailing lists
> (
> Note: The Apache Software Foundation uses an extensive mirroring
> network for distributing releases.  It is possible that the mirror you
> are using may not have replicated the release yet.  If that is the
> case, please try another mirror.  This also goes for Maven access.
> Happy searching,
> Apache Lucene/Solr Developers

Péter Király
eXtensible Catalog

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