The Intershop Commerce Management (ICM) 184.108.40.206 release contains a Tomcat 9 update that affects all projects migrating to this version. In particular, it affects projects still using Solr 4, which is supported by Intershop only until the end of the year (see Announcement - End of Maintenance of Solr 4).
Currently, Solr 4 in ICM is running on its own Tomcat 7. However, this "inner Tomcat" is removed with the Tomcat 9 update in ICM 7.10.31. In order to have a functioning Solr, project adaptions are necessary and a compatible ICM version must be used for the migration.
In case your project is still using Solr 4 and you are planning an ICM migration in the near future, this document shows your options. If your project already uses SolrCloud 8, you can stop reading here.
Note: SolrCloud 6
Intershop provides an adapter to use SolrCloud 6. Even though SolrCloud 6 is already a "cloud version", the corresponding adapter would require a new release to be compatible with the Tomcat 9 update.
Since this adapter has already reached the "end-of-life" status in 2020, there will be no new release for this adapter anymore.
Consequently this means, if your project is using SolrCloud 6, the following two options apply to you as well!
If you are planning an ICM update to ICM 7.10.31+, we recommend updating the search service as well.
For Intershop Commerce Platform (previously known as CaaS) customers, Intershop provides the necessary SolrCloud 8 cluster.
If you choose this option, you can migrate to any ICM 7.10.31+ version.
The following steps have to be performed:
These are the advantages of doing the update during the ICM migration:
For further information, refer to: Announcement - End of Maintenance of Solr 4
This might be considered as a disadvantage:
If you want to stay on a current version, get critical bug fixes, but continue to use Solr4, you can migrate to ICM 7.10.26-LTS. The Long Term Support (LTS) release gets hotfixes until the end of December 2021, so you have more time for the SolrCloud 8 migration.
The following steps need to be done:
This is the advantages of staying on the LTS releases:
This should be considered :