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Ref Guide: update for 8.7 release notes; bring notes from 8.6.1 forward to keep branch_8x and master at least sort of in sync
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@ -38,6 +38,96 @@ Detailed steps for upgrading a Solr cluster are in the section <<upgrading-a-sol
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If you are upgrading from 7.x, see the section <<Upgrading from 7.x Releases>> below.
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=== Solr 8.7
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See the https://cwiki.apache.org/confluence/display/SOLR/ReleaseNote87[8.7 Release Notes^]
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for an overview of the main new features of Solr 8.7.
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When upgrading to 8.6.x users should be aware of the following major changes from 8.6.
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*Autoscaling*
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* If upgrading from **8.6.0**, please see the <<Solr 8.6.1,8.6.1 Upgrade notes>> below for information on performance degradations introduced in 8.6.0 that require some intervention to resolve.
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If you are already on 8.6.1 or higher, you can ignore these instructions.
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*Deprecations*
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* The autoscaling framework is now formally deprecated and will be removed in Solr 9.0.
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The Solr community is working on a plugin to replace this functionality, with the goal for it to be ready by the time 9.0 is released.
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*Legacy Scaling (non-SolrCloud) Terminology Updated*
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* Solr has replaced the terms "master" and "slave" in the codebase and all documentation with "leader" and "follower".
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This impacts the functionality described in the section <<legacy-scaling-and-distribution.adoc#legacy-scaling-and-distribution,Legacy Scaling and Distribution>>.
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This functionality has only changed in terms of parameter names changed, and we do not expect any back-compatibility issues on upgrade to 8.7 or even 9.0 later.
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However, users should update their `solrconfig.xml` files after completing the upgrade on all nodes of a cluster.
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Comparing your configuration to the updated configuration examples in <<index-replication.adoc#index-replication,Index Replication>> will show examples of what needs to change, but here are the main changes:
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. On the replication leader, in the definition of the `/replication` request handler:
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.. Replace "master" with "leader".
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.. Replace "slave" with "follower" if the former term is used in the name of any follower `solrconfig.xml` file definitions.
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This file can be named anything, so you can change it to whatever you'd like to call it if you'd like.
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.. Replace "slave" with "follower" if the former term is used in a replication repeater configuration.
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. On the replication follower, in the definition of the `/replication` request handler:
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.. Replace "masterUrl" with "leaderUrl".
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.. Replace "slave" with "follower" if the former term is used in a repeater configuration.
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*JSON Facets*
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* Performance enhancements for the `relatedness()` statistics function are included with 8.7.
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These yield the highest benefits with high-cardinality fields and can be disabled if working with lower cardinality fields with a new `sweep_collection` parameter.
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See the section <<json-facet-api.adoc#relatedness-options,relatedness() Options>> for details.
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*solr.in.sh / solr.in.cmd*
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* Solr has relied on the `SOLR_STOP_WAIT` parameter defined in `solr.in.sh` or `solr.in.cmd` to determine how long to wait on _startup_. A new parameter `SOLR_START_WAIT` allows defining how long Solr should wait for start up to complete.
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If the time set by this parameter is exceeded, Solr will exit the startup process and return the last few lines of the `solr.log` file to the terminal.
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By default, this parameter is set to the same value as `SOLR_STOP_WAIT`.
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* The default ZooKeeper client timeout (`ZK_CLIENT_TIMEOUT`) is now 30 seconds (`30000` milliseconds) instead of 15.
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*Configsets*
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* It's now possible to overwrite an existing configset when uploading changes by supplying the `overwrite=true` parameter to the <<configsets-api.adoc#configsets-upload,Configset API>>.
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A related parameter is `cleanup=true`, which allows deleting any files from the old configset that are left behind after the overwrite.
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The default for both of these parameters is `false`.
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* When deleting a collection that has an automatically created configset (i.e., the configset was copied from the `_default` collection when the collection was created), the configset will also be deleted if it is not in use by any other collection.
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*Logging*
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* A request ID (`rid`) is now logged for all distributed search requests (in SolrCloud) which can be used to correlate query events across the system.
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A parameter `disableRequestId=true` can be added to disable this if desired.
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=== Solr 8.6.1
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See the https://cwiki.apache.org/confluence/display/SOLR/ReleaseNote861[8.6.1 Release Notes^]
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for an overview of the fixes included in Solr 8.6.1.
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When upgrading to 8.6.1 users should be aware of the following major changes from 8.6.0.
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*Autoscaling*
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* As mentioned in the 8.6 upgrade notes, a default autoscaling policy was provided starting in 8.6.0.
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This default autoscaling policy resulted in increasingly slow collection creation calls in large clusters (50+ collections).
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In 8.6.1 the default autoscaling policy has been removed, and clusters will not use autoscaling unless a policy has explicitly been created.
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If your cluster is running 8.6.0 and *not using an explicit autoscaling policy*, upgrade to 8.6.1 and remove the default cluster policy and preferences via the following command.
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Replace `localhost:8983` with your Solr endpoint.
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```
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curl -X POST -H 'Content-type:application/json' -d '{set-cluster-policy : [], set-cluster-preferences : []}' http://localhost:8983/api/cluster/autoscaling
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```
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This information is only relevant for users upgrading from 8.6.0. If upgrading from an earlier version to 8.6.1+, this warning can be ignored.
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=== Solr 8.6
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See the https://cwiki.apache.org/confluence/display/SOLR/ReleaseNote86[8.6 Release Notes^]
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