Page History

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Solr 9.0.0 Release Highlights:

Security

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• Certificate Authentication Plugin: Supports loading the certificate subject via a user principal into the AuthorizationContext and enables end-to-end use of client certificates for Authentication and Authorization

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• Improved security when using PKI Authentication plugin

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• Upgrade to ZK 3.7 allows for TLS communication between Solr and Zookeeper

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• Jetty Request log enabled by default

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• All request handlers support security permissions for access

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• Ability to disable admin UI through a system property
• The property blockUnknown in the BasicAuthPlugin and the JWTAuthPlugin now defaults to true. This change is backward incompatible. If you need the pre-9.0 default behavior, you need to explicitly set blockUnknown:false in security.json.
• The allow-list defining allowed URLs for the shards parameter is not in the shardHandler configuration anymore. It is defined by the allowUrls top-level property of the solr.xml file. For more information, see Format of solr.allowUrls documentation

Stability

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• Solr now runs with the java security manager enabled by default. Administrators that need to run Solr with Hadoop will need to disable this feature by setting 
• Solr embedded zookeeper only binds to localhost by default. This embedded zookeeper should not be used in production. If you rely upon the previous behavior, then you can change the clientPortAddress in solr/server/solr/zoo.cfg

Stability

• Dependency updates - A lot of dependency updates make Solr overall much more stable and secure.

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• Rate limiting privides 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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• Distributed Overseer (optional) allows for distributed processing of clsuter state updates and Collection and Config API call processing without relying on the Overseer.

Others

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• Admin UI support for SQL Querying
• HDFS code is now an independent module

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• 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

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• Independent build and release

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• Build system switched to gradle, no longer uses ant

Docker

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• Image creation is now a part of the Apache Solr Github repo

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• Solr Docker image documentation is now a part of the reference guide

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• Official image upgraded to use JDK17 (by Eclipse Temurin) and ability to create functionally identical local image

Deprecations and Removal

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• Data Import Handler has been removed from Solr

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• Legacy cloud mode is no longer supported

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• No more support for clusterstate.json and MIGRATESTATE API has been removed. If your collections use clusterstate.json, please refer to the 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 has been removed from Solr. This encompasses all previous included /browse and wt=velocity examples.
• Legacy SolrCache implementations (LRUCache, LFUCache, FastLRUCache) have been removed. Users have to modify their existing configurations to use CaffeineCache instead.
• Cross Data Center Replication has been removed in this released.