What's New in Apache Solr

Apache Solr is updated from 8.4.1 to 8.11.2 in this release of Cloudera Runtime. For more information, see Apache Solr Release Notes in the upstream documentation. For the list of notable unsupported features, see Unsupported features.

Solr now supports rolling upgrades. This means that rolling upgrades are available from release 7.1.9 to higher. Upgrades to release 7.1.9 still involve service downtime.

Using Local File System (LFS) for both MapReduce Indexer Tool (MRIT) and HBase MRIT is now supported.

Spark 3 is now supported.

Spark 2 is deprecated in this release and support will be dropped in an upcoming release.

This release introduces the following two health checks for the Solr service which give information about the status of the cores hosted on different hosts:

Recovering cores: By default this check reports concerning health if any of the hosted cores are in recovering status. This threshold can be modified in the configurations with the solr_recovering_core_thresholds confiuration parameter.
Critical cores: By default this check reports "bad health" if any of the hosted cores are in down or recovery failed status. This threshold can be modified in the configurations with the solr_critical_core_thresholds config.

These checks are enabled by default for the Infra Solr service but disabled by default for the Workload Solr services (Cloudera Search).

Critical CVE fixes.