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Comment: Introduce a plan for TLP

Solr 8.7

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Autumn 2020

ItemDescriptionContributorsThemeJira
SIP-9Advanced Query parser and supporting lucene filtersMike Nibeck (LOC contributor), Gus HeckFeature
Multi-threaded search (SOLR-13350)Multi threaded search across multiple segments at once, using CollectorManagersIshan Chattopadhyaya, Atri SharmaOptimization
CPU Utilisation Based Circuit Breakers
Atri SharmaFeatureSOLR-14615
New Cluster APIStandard set of APIs which consists of only interfaces. We should ensure that They are used wherever possible in server/client code. We should expose these interfaces to our plugins. They should be well -documented and we must always strive to maintain backward compatibility on these interfaces between versionsNoble PaulClean-APISOLR-14680
New Remote Call APIRemote Calls should have simple constructs and they must be public interfaces. This should be used in all inter-node/client-server communicationsNoble PaulClean-APISOLR-14712
Alternate SolrJ APIs without using NamedList/SimpleOrderedMap/MapGet rid of concrete classes such as NamedList,SimpleOrderedMap, Map, etc and build our public APIs with interfacesNoble PaulClean-APISOLR-14730

Solr 8.8

End of 2020? Last version before 9.0?

ItemDescriptionContributorsThemeJira





Establish Solr TLP

The git repo is split, gradle build adapted, release process separated etc. See Solr TLP needed changes for all related tasks.

The 9.0 release will be the first release after the TLP split.

Lucene will first release v9.0.0 without Solr

...

, and then Solr can independently release Solr 9.0 with Lucene 9.0 when Solr is ready for it.

Solr 9.0

Early 2021. First release as TLP. The theme of this release is to use Lucene 9.0 and to introduce some major frameworks.

We should not remove all features deprecated in 8.x yet, to give users a path to upgrade to 9.x without having the pain of having to migrate to alternatives.

ItemDescriptionContributorsThemeJira
First party packages & Slim Solr distributionSolr should have first party packages, and a slim Solr tarball that doesn't have the first party packagesIshan, Noble, Jan, et. al.Lean Solr Core
V2 API to be the defaultRef guide docs should use V2, where necessary we build V2 APIs, switch SolrJ to use V2 APIs, etc.
Usability
Autoscaling / Replica assignment V2A new pluggable framework replaces current autoscalingAndrzej, Ilan, NobleLean Solr Core
HDFS moved away from Solr-CoreBuild a first party package out of HDFS supportIstvan Farkas, GezapetiLean Solr Core
Remove Ant supportThis is partly done
Tech-debt
Index Lifecycle ManagementAutomatically move indices between hot, warm and cold phasesAtri SharmaFeature
POJOs instead of loosely typed objectsStart using POJOs/interfaces wherever possible in public APIs where ever possibleNoble Paul

Remove Filter.java from SolrFilter.java is a legacy relic from earlier Lucene days.  Solr uses Filter in a variety of places where it can use other constructs or in some cases we need to make new constructs.  In some cases like TwoPhaseIterator, this is an optimization.David SmileyTech-debt

Jira
serverASF JIRA
serverId5aa69414-a9e9-3523-82ec-879b028fb15b
keySOLR-12336

Solr 9.1

Soon after 9.0. The main theme of this release is to remove deprecations that are still present in 9.0.

This release may still depend on Lucene 9.0 if we wish.

ItemDescriptionContributorsThemeJira
Remove deprecated feature X



Remove deprecated feature Y



Solr 10+ Roadmap