THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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https://solr.apache.org/docs/9_0_0/changes/Changes.html
This is a major-version release with breaking changes. The highlights below is not the full list. Please consult the "Solr Upgrade Notes" when planning an upgrade:
https://solr.apache.org/guide/solr/9_0/upgrade-notes/solr-upgrade-notes.html
Solr 9.0.0 Release Highlights:
Security
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Minimum Java version supported: Java 11
- Powered by Lucene 9.0, with numerous small and large improvements, such as smaller index footprint.
Querying and Indexing
- Dense Vector "Neural" Search through DenseVectorField fieldType and K-Nearest-Neighbor (KNN) Query Parser.
- Admin UI support for SQL Querying.
- New snowball stemmers: Hindi, Indonesian, Nepali, Serbian, Tamil, and Yiddish.
- New NorwegianNormalizationFilter.
Security
- Certificate Authentication Plugin that enables end-to-end use of x509 client certificates for Authentication and Authorization.
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- Improved security when using PKI Authentication plugin.
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- Upgrade to
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- Zookeeper 3.7
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- , allowing for TLS
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- protected ZK communication.
- All request handlers support security permissions for access.
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Stability
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- Ability to disable admin UI through a system property
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- .
- The property blockUnknown in the BasicAuthPlugin and JWTAuthPlugin now defaults to true instead of false.
- Solr now runs with the Java security manager enabled by default. Hadoop users may need to disable this.
- Solr embedded zookeeper only binds to localhost by default. See Upgrade Notes for how to obtain old behavior.
- A lot of dependency updates make Solr
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- much more
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- secure.
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Stability and Scalability
- Rate limiting
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- provides a way to throttle update and search requests based on usage metrics.
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- Task management interface allows declaring tasks as cancellable and trackable.
Scalability
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- Ability to specify node roles in Solr. This release supports 'Overseer' and 'Data' roles out of the box.
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- New API for pluggable replica assignment implementations
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- that replaces the auto-scaling framework.
- Support for distributed processing of
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- cluster state updates and
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- collection API calls without relying on the Overseer.
Others
- HDFS code is now an independent module
- Metrics handler only depends on SolrJ instead of core and has its own log4j2.xml now so it doesn’t share Solr’s logging config
Build
- Independent build and release
- Build system switched to gradle, no longer uses ant
Docker
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Build and Docker
- Solr is now built and released independently of Apache Lucene (separate Apache projects).
- Build system switched to Gradle from Ant + Ivy.
- Docker image creation is now a part of the Apache Solr Github repo.
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- Docker image documentation is now a part of the reference guide.
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- Official Docker image upgraded to use JDK17 (by Eclipse Temurin) and ability to create
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- a local image that is functionally identical to the official one.
Other
- Contrib modules are now just "modules". You can easily enable module(s) through environment variable SOLR_MODULES.
- Features lifted out as separate modules are: HDFS, Hadoop-Auth, SQL, Scripting, and JWT-Auth.
- The "dist" folder in the release is gone. Module jars are now inside respective module's lib/ folder.
- Metrics handler only depends on SolrJ instead of core and has its own log4j2.xml now so it doesn’t share Solr’s logging config.
- SolrJ class CloudSolrClient now supports HTTP2. It has a new Builder. See CloudLegacySolrClient for the 8.x version of this class
- Jetty Request log is now enabled by default, i.e. logging every request.
Deprecations and Removals
Deprecations and Removal
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- The Data Import Handler (DIH) is an independent project now; it is no longer a part of Solr.
- No more support for clusterstate.json and MIGRATESTATE API has been removed. If your collections use clusterstate.json, please refer to the
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- Upgrade Notes.
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- Auto scaling framework has been removed. Please refer to replica placement plugins for alternate options
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- .
- LegacyBM25SimilarityFactory has been removed.
- VelocityResponseWriter is an independent project now; it is no longer a part of Solr. This encompasses all previously included /browse and wt=velocity examples.
- Legacy SolrCache implementations (LRUCache, LFUCache, FastLRUCache) have been removed. Users should modify their existing configurations to use CaffeineCache instead.
- Cross Data Center Replication has been removed
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- SolrJ clients like HttpSolrClient and LBHttpSolrClient that lacked HTTP2 support have been deprecated. The old CloudSolrClient has been renamed as CloudLegacySolrClient and deprecated.
- SimpleFSDirectoryFactory is removed in favor of NIOFSDirectoryFactory.