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[GitHub] [solr] janhoy opened a new pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
janhoy opened a new pull request #769:
URL: https://github.com/apache/solr/pull/769
https://issues.apache.org/jira/browse/SOLR-15898
* Upgrade Notes page now targets 9.0 (will add 10.0 section to main in separate PR)
* Moved the 8.x upgrade notes from `solr-upgrade-notes.adoc` to bottom of `major-changes-in-solr-9.adoc`.
* Started with outline for structuring 9.0 changes
TODO:
* Complete the "Upgrade planning" section, with high-level wording and summaries
* Move all notes around to correct section headings
* Re-write notes to have an end-user perspective, consolidate as needed and remove non-major changes
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[GitHub] [solr] epugh commented on a change in pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
Posted by GitBox <gi...@apache.org>.
epugh commented on a change in pull request #769:
URL: https://github.com/apache/solr/pull/769#discussion_r840782892
##########
File path: solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
##########
@@ -347,4 +373,818 @@ where they really belong: /admin/threads, /admin/properties, /admin/logging
* Atomic/partial updates to nested documents now _require_ the `\_root_` field to clearly show the document isn't a root document. Solr 8 would fallback on the `\_route_` param but no longer.
-* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
\ No newline at end of file
+* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
+
+=== Solr Binary Release `dist/` Directory
+
+The `dist/` directory in the Solr binary release has been removed as of Solr 9.0.
+
+* The `solr-core` and `solr-solrj` jars can be found under `server/solr-webapp/webapp/WEB-INF/lib/`.
+* The Solr module jars can be found in `modules/<module-name>/lib`, packaged individually for each module.
+* The `solrj-deps` (SolrJ Dependencies) are no longer separated out from the other Server jars.
+Please refer to the SolrJ Maven artifact to see the exact dependencies you need to include from `server/solr-webapp/webapp/WEB-INF/lib/` and `server/lib/ext/` if you are loading in SolrJ manually.
+If you plan on using SolrJ as a JDBC driver, please refer to the xref:query-guide:sql-query.adoc#generic-clients[JDBC documentation]
+
+[#major-changes-in-earlier-8-x-versions]
+== Major Changes in Earlier 8.x Versions
+
+The following is a list of major changes released between Solr 8.1 and 8.11.
+
+Please be sure to review this list so you understand what may have changed between the version of Solr you are currently running and Solr 9.0.
+
+=== Solr 8.11
+
+See the https://cwiki.apache.org/confluence/display/SOLR/Release+Notes+8.11[8.11 Release Notes^]
+for an overview of the main new features of Solr 8.11.
+
+When upgrading to 8.11.x users should be aware of the following major changes from 8.10.
+
+*Support for Multiple Authentication Schemes*
+
+Two new authentication and authorization plugins provide support for configuring multiple authentication schemes.
+
+The `MultiAuthPlugin` allows combining two or more authentication approaches, such as JWT and Basic authentication.
+
+The `MultiAuthRuleBasedAuthorizationPlugin` is used when the `MultiAuthPlugin` is also in use, and combines the various roles defined for all plugins to determine the proper role assignment for the user account.
+
+For information on configuring these plugins, see the following sections:
+
+* xref:deployment-guide:basic-authentication-plugin.adoc#combining-basic-authentication-with-other-schemes[Combining Basic Authentication with Other Schemes]
+* xref:deployment-guide:rule-based-authorization-plugin.adoc#multiple-authorization-plugins[Multiple Authorization Plugins]
+
+
+*ZooKeeper chroot*
+
+It's now possible to create the ZooKeeper chroot at startup if it does not already exist.
+See the section xref:deployment-guide:zookeeper-ensemble.adoc#using-the-z-parameter-with-binsolr[Using the -z Parameter with bin/solr] for an example.
+
+*Other Changes*
+
+A few other minor changes are worth noting:
+
+* The `config-read` pre-defined permission now correctly governs access for various configuration-related APIs.
+See also xref:deployment-guide:rule-based-authorization-plugin.adoc#predefined-permissions[Predefined Permissions].
+* The S3BackupRepository supports configuring the AWS Profile, if necessary. See also xref:deployment-guide:backup-restore.adoc#s3backuprepository[S3BackupRepository].
+* Additionally, backups will now properly succeed after SPLITSHARD operations, and will correctly handle incremental backup purges.
+* SolrJ now supports uploading configsets.
+
+
+
+=== Solr 8.10
+
+See the https://cwiki.apache.org/confluence/display/SOLR/ReleaseNote8_10[8.10 Release Notes^]
+for an overview of the main new features of Solr 8.10.
+
+When upgrading to 8.10.x users should be aware of the following major changes from 8.9.
+
+*Schema Designer UI*
+
+A new screen has been added to the Admin UI that allows you to interactively design a Solr schema using your documents.
+
+The designer screen provides a safe environment for you to:
+
+* Upload or paste sample documents to identify fields.
+* Get a "first" guess at what Solr thinks the field types in the fields should be.
+* Edit fields, field types, dynamic fields, and supporting files.
+* See how a field's analysis will impact your text.
+* Test how schema changes will impact query-time behavior.
+* Save your changes to a configset to use with a new collection.
+
+See the section xref:indexing-guide:schema-designer.adoc[] for full details.
+
+*Backups in S3*
+
+Following the redesign of backups in Solr 8.8 that allowed storage of incremental backups in Google Cloud environments, Solr 8.10 provides support for storing backups in Amazon S3 buckets.
+
+See the section xref:deployment-guide:backup-restore.adoc#s3backuprepository[S3BackupRepository] for how to configure.
+
+*Security Admin UI*
+
+Solr's Admin UI also got a new screen to support management of users, roles, and permissions.
+
+The new UI works when authentication and/or authorization has been enabled with `bin/solr auth` or by manually installing a `security.json` file.
+Before this, it provides a warning that your Solr instance is unsecured.
+
+See the section xref:deployment-guide:security-ui.adoc[] for details.
+
+*Solr SQL Improvements*
Review comment:
Never mind, I see that this is the chronological time line...
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[GitHub] [solr] epugh commented on a change in pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
Posted by GitBox <gi...@apache.org>.
epugh commented on a change in pull request #769:
URL: https://github.com/apache/solr/pull/769#discussion_r840782201
##########
File path: solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
##########
@@ -347,4 +373,818 @@ where they really belong: /admin/threads, /admin/properties, /admin/logging
* Atomic/partial updates to nested documents now _require_ the `\_root_` field to clearly show the document isn't a root document. Solr 8 would fallback on the `\_route_` param but no longer.
-* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
\ No newline at end of file
+* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
+
+=== Solr Binary Release `dist/` Directory
+
+The `dist/` directory in the Solr binary release has been removed as of Solr 9.0.
+
+* The `solr-core` and `solr-solrj` jars can be found under `server/solr-webapp/webapp/WEB-INF/lib/`.
+* The Solr module jars can be found in `modules/<module-name>/lib`, packaged individually for each module.
+* The `solrj-deps` (SolrJ Dependencies) are no longer separated out from the other Server jars.
+Please refer to the SolrJ Maven artifact to see the exact dependencies you need to include from `server/solr-webapp/webapp/WEB-INF/lib/` and `server/lib/ext/` if you are loading in SolrJ manually.
+If you plan on using SolrJ as a JDBC driver, please refer to the xref:query-guide:sql-query.adoc#generic-clients[JDBC documentation]
+
+[#major-changes-in-earlier-8-x-versions]
+== Major Changes in Earlier 8.x Versions
+
+The following is a list of major changes released between Solr 8.1 and 8.11.
+
+Please be sure to review this list so you understand what may have changed between the version of Solr you are currently running and Solr 9.0.
+
+=== Solr 8.11
+
+See the https://cwiki.apache.org/confluence/display/SOLR/Release+Notes+8.11[8.11 Release Notes^]
+for an overview of the main new features of Solr 8.11.
+
+When upgrading to 8.11.x users should be aware of the following major changes from 8.10.
+
+*Support for Multiple Authentication Schemes*
+
+Two new authentication and authorization plugins provide support for configuring multiple authentication schemes.
+
+The `MultiAuthPlugin` allows combining two or more authentication approaches, such as JWT and Basic authentication.
+
+The `MultiAuthRuleBasedAuthorizationPlugin` is used when the `MultiAuthPlugin` is also in use, and combines the various roles defined for all plugins to determine the proper role assignment for the user account.
+
+For information on configuring these plugins, see the following sections:
+
+* xref:deployment-guide:basic-authentication-plugin.adoc#combining-basic-authentication-with-other-schemes[Combining Basic Authentication with Other Schemes]
+* xref:deployment-guide:rule-based-authorization-plugin.adoc#multiple-authorization-plugins[Multiple Authorization Plugins]
+
+
+*ZooKeeper chroot*
+
+It's now possible to create the ZooKeeper chroot at startup if it does not already exist.
+See the section xref:deployment-guide:zookeeper-ensemble.adoc#using-the-z-parameter-with-binsolr[Using the -z Parameter with bin/solr] for an example.
+
+*Other Changes*
+
+A few other minor changes are worth noting:
+
+* The `config-read` pre-defined permission now correctly governs access for various configuration-related APIs.
+See also xref:deployment-guide:rule-based-authorization-plugin.adoc#predefined-permissions[Predefined Permissions].
+* The S3BackupRepository supports configuring the AWS Profile, if necessary. See also xref:deployment-guide:backup-restore.adoc#s3backuprepository[S3BackupRepository].
+* Additionally, backups will now properly succeed after SPLITSHARD operations, and will correctly handle incremental backup purges.
+* SolrJ now supports uploading configsets.
+
+
+
+=== Solr 8.10
+
+See the https://cwiki.apache.org/confluence/display/SOLR/ReleaseNote8_10[8.10 Release Notes^]
+for an overview of the main new features of Solr 8.10.
+
+When upgrading to 8.10.x users should be aware of the following major changes from 8.9.
+
+*Schema Designer UI*
+
+A new screen has been added to the Admin UI that allows you to interactively design a Solr schema using your documents.
+
+The designer screen provides a safe environment for you to:
+
+* Upload or paste sample documents to identify fields.
+* Get a "first" guess at what Solr thinks the field types in the fields should be.
+* Edit fields, field types, dynamic fields, and supporting files.
+* See how a field's analysis will impact your text.
+* Test how schema changes will impact query-time behavior.
+* Save your changes to a configset to use with a new collection.
+
+See the section xref:indexing-guide:schema-designer.adoc[] for full details.
+
+*Backups in S3*
+
+Following the redesign of backups in Solr 8.8 that allowed storage of incremental backups in Google Cloud environments, Solr 8.10 provides support for storing backups in Amazon S3 buckets.
+
+See the section xref:deployment-guide:backup-restore.adoc#s3backuprepository[S3BackupRepository] for how to configure.
+
+*Security Admin UI*
+
+Solr's Admin UI also got a new screen to support management of users, roles, and permissions.
+
+The new UI works when authentication and/or authorization has been enabled with `bin/solr auth` or by manually installing a `security.json` file.
+Before this, it provides a warning that your Solr instance is unsecured.
+
+See the section xref:deployment-guide:security-ui.adoc[] for details.
+
+*Solr SQL Improvements*
Review comment:
Is this a place we could add a mention of the new SQL Query screen in the Admin UI?
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[GitHub] [solr] HoustonPutman commented on a change in pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
Posted by GitBox <gi...@apache.org>.
HoustonPutman commented on a change in pull request #769:
URL: https://github.com/apache/solr/pull/769#discussion_r839728567
##########
File path: solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
##########
@@ -347,4 +377,817 @@ where they really belong: /admin/threads, /admin/properties, /admin/logging
* Atomic/partial updates to nested documents now _require_ the `\_root_` field to clearly show the document isn't a root document. Solr 8 would fallback on the `\_route_` param but no longer.
-* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
\ No newline at end of file
+* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
+
+=== Solr Binary Release `dist/` Directory
+
+The `dist/` directory in the Solr binary release has been removed as of Solr 9.0.
+
+* The `solr-core` and `solr-solrj` jars can be found under `server/solr-webapp/webapp/WEB-INF/lib/`.
+* The Solr module jars can be found in `modules/<module-name>/lib`, packaged individually for each module.
+* The `solrj-deps` (SolrJ Dependencies) are no longer separated out from the other Server jars.
+Please refer to the SolrJ Maven artifact to see the exact dependencies you need to include from `server/solr-webapp/webapp/WEB-INF/lib/` and `server/lib/ext/` if you are loading in SolrJ manually.
+If you plan on using SolrJ as a JDBC driver, please refer to the xref:query-guide:sql-query.adoc#generic-clients[JDBC documentation]
+
+== Major Changes in Earlier 8.x Versions
+
+The following is a list of major changes released between Solr 8.1 and 8.11.
+
+Please be sure to review this list so you understand what may have changed between the version of Solr you are currently running and Solr 9.0.
+
+=== Solr 8.11
Review comment:
@janhoy I understand that this is the way we have been doing it for previous versions, but to me it makes very little sense. I think we should put the 8.x notes in major-changes-in-solr-8, and move the 7.x notes to major-changes-in-solr-7. I'm happy to do the work if others agree.
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[GitHub] [solr] janhoy commented on pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
Posted by GitBox <gi...@apache.org>.
janhoy commented on pull request #769:
URL: https://github.com/apache/solr/pull/769#issuecomment-1083854152
I think I'm done with the "Upgrade Prerequisites" and "Rolling Upgrades" chapters.
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[GitHub] [solr] janhoy commented on a change in pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
Posted by GitBox <gi...@apache.org>.
janhoy commented on a change in pull request #769:
URL: https://github.com/apache/solr/pull/769#discussion_r836716799
##########
File path: solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
##########
@@ -347,4 +377,817 @@ where they really belong: /admin/threads, /admin/properties, /admin/logging
* Atomic/partial updates to nested documents now _require_ the `\_root_` field to clearly show the document isn't a root document. Solr 8 would fallback on the `\_route_` param but no longer.
-* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
\ No newline at end of file
+* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
+
+=== Solr Binary Release `dist/` Directory
+
+The `dist/` directory in the Solr binary release has been removed as of Solr 9.0.
+
+* The `solr-core` and `solr-solrj` jars can be found under `server/solr-webapp/webapp/WEB-INF/lib/`.
+* The Solr module jars can be found in `modules/<module-name>/lib`, packaged individually for each module.
+* The `solrj-deps` (SolrJ Dependencies) are no longer separated out from the other Server jars.
+Please refer to the SolrJ Maven artifact to see the exact dependencies you need to include from `server/solr-webapp/webapp/WEB-INF/lib/` and `server/lib/ext/` if you are loading in SolrJ manually.
+If you plan on using SolrJ as a JDBC driver, please refer to the xref:query-guide:sql-query.adoc#generic-clients[JDBC documentation]
+
+== Major Changes in Earlier 8.x Versions
+
+The following is a list of major changes released between Solr 8.1 and 8.11.
+
+Please be sure to review this list so you understand what may have changed between the version of Solr you are currently running and Solr 9.0.
+
+=== Solr 8.11
Review comment:
Separate sections for each 8.x release, just like we have separate sections for each 7.x here https://solr.apache.org/guide/8_0/major-changes-in-solr-8.html
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[GitHub] [solr] janhoy commented on a change in pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
Posted by GitBox <gi...@apache.org>.
janhoy commented on a change in pull request #769:
URL: https://github.com/apache/solr/pull/769#discussion_r839068571
##########
File path: solr/solr-ref-guide/modules/deployment-guide/pages/authentication-and-authorization-plugins.adoc
##########
@@ -207,12 +207,13 @@ Solr has a built-in `PKIAuthenticationPlugin` (described below) that is always a
Each Authentication plugin may also decide to secure inter-node requests on its own.
They may do this through the so-called `HttpClientBuilder` mechanism, or they may alternatively choose on a per-request basis whether to delegate to PKI or not by overriding a `interceptInternodeRequest()` method from the base class, where any HTTP headers can be set.
+[#pkiauthenticationplugin]
=== PKIAuthenticationPlugin
The `PKIAuthenticationPlugin` provides a built-in authentication mechanism where each Solr node is a super user and is fully trusted by other Solr nodes through the use of Public Key Infrastructure (PKI).
Each Authentication plugin may choose to delegate all or some inter-node traffic to the PKI plugin.
-There are currently two versions of the PKI Authentication protocol available in Solr. For each outgoing request `PKIAuthenticationPlugin` adds a special header which carries the request timestamp and user principal.
+There are currently two versions of the PKI Authentication protocol available in Solr.For each outgoing request `PKIAuthenticationPlugin` adds a special header which carries the request timestamp and user principal.
Review comment:
```suggestion
There are currently two versions of the PKI Authentication protocol available in Solr. For each outgoing request `PKIAuthenticationPlugin` adds a special header which carries the request timestamp and user principal.
```
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[GitHub] [solr] janhoy commented on a change in pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
Posted by GitBox <gi...@apache.org>.
janhoy commented on a change in pull request #769:
URL: https://github.com/apache/solr/pull/769#discussion_r840107194
##########
File path: solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
##########
@@ -347,4 +377,817 @@ where they really belong: /admin/threads, /admin/properties, /admin/logging
* Atomic/partial updates to nested documents now _require_ the `\_root_` field to clearly show the document isn't a root document. Solr 8 would fallback on the `\_route_` param but no longer.
-* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
\ No newline at end of file
+* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
+
+=== Solr Binary Release `dist/` Directory
+
+The `dist/` directory in the Solr binary release has been removed as of Solr 9.0.
+
+* The `solr-core` and `solr-solrj` jars can be found under `server/solr-webapp/webapp/WEB-INF/lib/`.
+* The Solr module jars can be found in `modules/<module-name>/lib`, packaged individually for each module.
+* The `solrj-deps` (SolrJ Dependencies) are no longer separated out from the other Server jars.
+Please refer to the SolrJ Maven artifact to see the exact dependencies you need to include from `server/solr-webapp/webapp/WEB-INF/lib/` and `server/lib/ext/` if you are loading in SolrJ manually.
+If you plan on using SolrJ as a JDBC driver, please refer to the xref:query-guide:sql-query.adoc#generic-clients[JDBC documentation]
+
+== Major Changes in Earlier 8.x Versions
+
+The following is a list of major changes released between Solr 8.1 and 8.11.
+
+Please be sure to review this list so you understand what may have changed between the version of Solr you are currently running and Solr 9.0.
+
+=== Solr 8.11
Review comment:
It makes kind of sense, since the target audience for 9.0 would typically be someone upgrading from 8.x. And if you are on e.g. 8.4, you need to catch up on the diff between 8.4 - 8.11.
Could be that improvements can be made here, but let's not rush anything. I'd also check with Cassandra who I'm sure will have thougths on the subject as technical writer.
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[GitHub] [solr] anshumg commented on a change in pull request #769: SOLR-15898 Upgrade-notes and major-changes for 9.0
Posted by GitBox <gi...@apache.org>.
anshumg commented on a change in pull request #769:
URL: https://github.com/apache/solr/pull/769#discussion_r836658713
##########
File path: solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
##########
@@ -347,4 +377,817 @@ where they really belong: /admin/threads, /admin/properties, /admin/logging
* Atomic/partial updates to nested documents now _require_ the `\_root_` field to clearly show the document isn't a root document. Solr 8 would fallback on the `\_route_` param but no longer.
-* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
\ No newline at end of file
+* SolrJ: The project is migrating away from the Apache HttpClient dependency in favor of Jetty's client (supporting HTTP/2), to occur over the 9x releases. We deprecated HttpSolrClient and friends in favor of Http2SolrClient and equivalents. For SolrCloud, the former CloudSolrClient was renamed CloudLegacySolrClient (deprecated), and instead BaseCloudSolrClient was renamed to CloudSolrClient and given a Builder for the Jetty based HTTP/2 client.
+
+=== Solr Binary Release `dist/` Directory
+
+The `dist/` directory in the Solr binary release has been removed as of Solr 9.0.
+
+* The `solr-core` and `solr-solrj` jars can be found under `server/solr-webapp/webapp/WEB-INF/lib/`.
+* The Solr module jars can be found in `modules/<module-name>/lib`, packaged individually for each module.
+* The `solrj-deps` (SolrJ Dependencies) are no longer separated out from the other Server jars.
+Please refer to the SolrJ Maven artifact to see the exact dependencies you need to include from `server/solr-webapp/webapp/WEB-INF/lib/` and `server/lib/ext/` if you are loading in SolrJ manually.
+If you plan on using SolrJ as a JDBC driver, please refer to the xref:query-guide:sql-query.adoc#generic-clients[JDBC documentation]
+
+== Major Changes in Earlier 8.x Versions
+
+The following is a list of major changes released between Solr 8.1 and 8.11.
+
+Please be sure to review this list so you understand what may have changed between the version of Solr you are currently running and Solr 9.0.
+
+=== Solr 8.11
Review comment:
Did you intend to add separate sections for all the 8x releases here or should we just have one consolidated section for 9.0?
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