The Apache Hive data warehouse software facilitates reading, writing, and managing large datasets residing in distributed storage using SQL. The following notes describe changes to Solr in recent releases that you should be aware of before upgrading.Apache Hive TM. Many of the examples in this guide deal with using Velocity to embed dynamic content in web sites, but all VTL. The Velocity User Guide is intended to help page designers and content providers get acquainted with Velocity and the syntax of its simple yet powerful scripting language, the Velocity Template Language (VTL).
Lessons learned from T408 program to help guide future Army aircraft June 11.Apache. The cleartext variant is named ' h2c ', the secure one ' h2 '.These notes highlight the biggest changes that may impact the largest number ofApache Product Management Office conducts future technology demonstration. It implements the complete set of features described by RFC 7540 and supports HTTP/2 over cleartext (http:), as well as secure (https:) connections. The HTTP/2 protocol is implemented by its own httpd module, aptly named modhttp2. A command line tool and JDBC driver are provided to connect users to Hive.HTTP/2 in Apache httpd.
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If you’re able to upgrade SolrJ to 8.8.xFor all of your client applications, then you can set -Dsolr.storeBaseUrl=false (introduced in Solr 8.8.1) to better align the stored stateIn ZooKeeper with future versions of Solr. Solr 8.8For an overview of the main new features of Solr 8.8.When upgrading to 8.8.x users should be aware of the following major changes from 8.7.The internal logic for identifying 'Solr Home' ( solr.solr.home) has been refactored to make testing less error prone.Plugin developers using SolrPaths.locateSolrHome() or 'new `SolrResourceLoader’ should check deprecation warnings as existing some existing functionality will be removed in 9.0.SOLR-14934 has more technical details about this change for those concerned.As of Solr 8.8.0, the base_url property was removed from the stored state for replicas (SOLR-12182). See Expand Component for details.A new request parameter update.partial.requireInPlace=true allows telling Solr to "fail fast" if all of the necessary conditions are not satisfied to allow an in-place update to succeed.The Metrics History feature, which allowed long-term storage and aggregation of Solr’s metrics, has been deprecated and will be removed in 9.0.When using EmbeddedSolrServer, it will no longer close CoreContainer instances that were passed to it. Solr 8.9For an overview of the main new features of Solr 8.9.When upgrading to 8.9.x users should be aware of the following major changes from 8.8.Solr 8.9 introduces extensive changes to Solr’s backup and restore support.A new backup format has been introduced in Solr 8.9 which replaces the previous snapshot-based backup.This new format enables ‘incremental’ backups.Repeated backups to a given location will take advantage of the data stored by their predecessors and will only operate on files that have changed since the previous backup.This is supported by default, simply by storing each backup file in the same location.The old and new formats are not compatible, although backups in the old format, a full snapshot of all files, can still be used to restore to Solr for the time-being.The old format is officially deprecated, and support for it is likely to be removed in Solr 9.0.For the time-being the old format can be created by defining a parameter incremental=false.Again, though, this support is likely to be removed in Solr 9.0.More documentation on backups is available at Making and Restoring Backups.New Collections API commands for backups:BlockCollapse: If documents have been (or could be) indexed in a way where documents with the same collapse key have been indexed contiguously in the index, a new "block collapse" provides a significant speed improvement over traditional collapse.Expand Null Groups: A new parameter expand.nullGroup allows an expanded group to be returned containing document with no value in the expanded field. Upgrading to 8.x ReleasesIf you are upgrading from 7.x, see the section Upgrading from 7.x Releases below. That file includes all the changes and updatesThat may effect your existing implementation.Detailed steps for upgrading a Solr cluster are in the section Upgrading a Solr Cluster.
If upgrading from an earlier version to 8.6.1+, this warning can be ignored.For an overview of the main new features of Solr 8.6.When upgrading to 8.6.x users should be aware of the following major changes from 8.5.Lucene added support for Block-Max WAND in 8.0, and 8.6 makes this available for Solr also.This can provide significant performance enhancements by not calculating the score for results which are not likely to appear in the top set of results.It is enabled when using a new query parameter minExactCount.This parameter tells Solr to accurately count the number of hits accurately until at least this value.Once this value is reached, Solr can skip over documents that don’t have a score high enough to be in the top set of documents, which has the potential for greatly speeding up searches.It’s important to note that when using this parameter, the hit count of searches may not be accurate.It is guaranteed that the hit count is accurate up to the value of minExactCount, but any returned hit count higher than that may be an approximation.A new boolean attribute numFoundExact is included in all responses to indicate if the hit count in the response is expected to be exact or not.More information about this new feature is available in the section minExactCount Parameter.Prior to Solr 8.6 Solr APIs which take a file system location, such as core creation, backup, restore, and others, did not validate the path and Solr would allow any absolute or relative path.Starting in 8.6 only paths that are relative to SOLR_HOME, SOLR_DATA_HOME and coreRootDir are allowed by default.If you need to create a core or store a backup outside the default paths, you will need to tell Solr which paths to allow.A new element in solr.xml called allowPaths takes a comma-separated list of allowed paths.When using the solr.xml file that ships with 8.6, you can configure the list of paths to allow through the system property solr.allowPaths.Please see bin/solr.in.sh or bin\solr.in.cmd for example usage.Using the value * will allow any path as in earlier versions.For more on this, see the section Solr.xml Parameters.Windows SMB shares on the UNC format, such as \\myhost\myshare\mypath are now always disallowed.Please use drive letter mounts instead, i.e., S:\mypath.A new authorization plugin ExternalRoleRuleBasedAuthorizationPlugin is now available.This plugin allows an authentication plugin (such as JWT) to supply a user’s roles instead of maintaining a user-to-role mapping inside Solr.When authentication is enabled, the Admin UI Dashboard (main screen) now includes a panel that shows the authentication and authorization plugins in use, the logged in username, and the roles assigned to this user.A new link will also appear in the left-hand navigation to allow a user to log out.The /export handler now supports streaming expressions to allow limiting the output of the export to only matching documents.For more information about how to use this, see the section Specifying the Local Streaming Expression.The stats, facet, and timeseries expressions now support percentiles and standard deviation aggregations.For the Unified Highlighter: The setting hl.fragsizeIsMinimum now defaults to false because true was found to be a significant performance regression when highlighting lots of text.This will yield longer highlights on average compared to Solr 8.5 but relatively unchanged compared to previous releases. Replace "slave" with "follower" if the former term is used in a repeater configuration.Curl -X POST -H 'Content-type:application/json' -d '' For more details on autoscaling policies, see the section Cluster Policy.This information is only relevant for users upgrading from 8.6.0. On the replication follower, in the definition of the /replication request handler:
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