Solr Upgrade Notes

The following notes describe changes to Solr in recent releases that you should be aware of before upgrading.

These notes are meant to highlight the biggest changes that may impact the largest number of implementations. It is not a comprehensive list of all changes to Solr in any release.

When planning your Solr upgrade, consider the customizations you have made to your system and review the CHANGES.txt file found in your Solr package. That file includes all of the changes and updates that may effect your existing implementation.

Detailed steps for upgrading a Solr cluster can be found in the section Upgrading a Solr Cluster.

Upgrading from 7.x Releases

Solr 7.2

See the 7.2 Release Notes for an overview of the main new features in Solr 7.2.

Users should be aware of the following major changes from v7.1:

  • Starting a query string with local parameters {!myparser …​} is used to switch from one query parser to another, and is intended for use by Solr system developers, not end users doing searches. To reduce negative side-effects of unintended hack-ability, Solr now limits the cases when local parameters will be parsed to only contexts in which the default parser is "lucene" or "func".

    So, if defType=edismax then q={!myparser …​} won’t work. In that example, put the desired query parser into the defType parameter.

    Another example is if deftype=edismax then hl.q={!myparser …​} won’t work for the same reason. In this example, either put the desired query parser into the hl.qparser parameter or set hl.qparser=lucene. Most users won’t run into these cases but some will need to change.

    If you must have full backwards compatibility, use luceneMatchVersion=7.1.0 or an earlier version.

  • The eDisMax parser by default no longer allows subqueries that specify a Solr parser using either local parameters, or the older _query_ magic field trick.

    For example, {!prefix f=myfield v=enterp} or _query_:"{!prefix f=myfield v=enterp}" are not supported by default any longer. If you want to allow power-users to do this, set uf=*,_query_ or some other value that includes _query_.

    If you need full backwards compatibility for the time being, use luceneMatchVersion=7.1.0 or something earlier.

Solr 7.1

See the 7.1 Release Notes for an overview of the main new features of Solr 7.1.

Users should be aware of the following major changes from v7.0:

  • The feature to automatically add replicas if a replica goes down, previously available only when storing indexes in HDFS, has been ported to the autoscaling framework. Due to this, autoAddReplicas is now available to all users even if their indexes are on local disks.

    Existing users of this feature should not have to change anything. However, they should note these changes:

    • Behavior: Changing the autoAddReplicas property from disabled (false) to enabled (true) using MODIFYCOLLECTION API no longer replaces down replicas for the collection immediately. Instead, replicas are only added if a node containing them went down while autoAddReplicas was enabled. The parameters autoReplicaFailoverBadNodeExpiration and autoReplicaFailoverWorkLoopDelay are no longer used.

    • Deprecations: Enabling/disabling autoAddReplicas cluster-wide with the API will be deprecated; use suspend/resume trigger APIs with name=".auto_add_replicas" instead.

      More information about the changes to this feature can be found in the section SolrCloud Automatically Adding Replicas.

  • Shard and cluster metric reporter configuration now require a class attribute.

    • If a reporter configures the group="shard" attribute then please also configure the class="org.apache.solr.metrics.reporters.solr.SolrShardReporter" attribute.

    • If a reporter configures the group="cluster" attribute then please also configure the class="org.apache.solr.metrics.reporters.solr.SolrClusterReporter" attribute.

      See the section Shard and Cluster Reporters for more information.

  • All Stream Evaluators in have been refactored to have a simpler and more robust structure. This simplifies and condenses the code required to implement a new Evaluator and makes it much easier for evaluators to handle differing data types (primitives, objects, arrays, lists, and so forth).

  • In the ReplicationHandler, the master.commitReserveDuration sub-element is deprecated. Instead please configure a direct commitReserveDuration element for use in all modes (master, slave, cloud).

  • The RunExecutableListener was removed for security reasons. If you want to listen to events caused by updates, commits, or optimize, write your own listener as native Java class as part of a Solr plugin.

  • In the XML query parser (defType=xmlparser or {!xmlparser …​ }) the resolving of external entities is now disallowed by default.

Upgrading to 7.0 from Any 6.x Release

The upgrade from Solr 6.x to Solr 7 introduces several major changes that you should be aware of before upgrading. Please do a thorough review of the section Major Changes in Solr 7 before starting your upgrade.

Upgrading from pre-6.x Versions of Solr

Users upgrading from versions of Solr prior to 6.x are strongly encouraged to consult CHANGES.txt for the details of all changes since the version they are upgrading from.

A summary of the significant changes between Solr 5.x and Solr 6.0 can be found in the section Major Changes from Solr 5 to Solr 6.

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