The preprocessing of documents is carried out by preprocessors running in any or index mode. If you set up the system according toLandscape Configuration, these are
For more information on the meaning of the modes, seePreprocessor Modes.
If the preprocessing capacity of the master and backup hosts is insufficient, you can use one host or multiple hosts exclusively for preprocessing. Preprocessing then takes place on additional preprocessors, allowing more documents to be preprocessed in parallel. This increases throughput for preprocessing.
On a host used exclusively for preprocessing, one or more preprocessors run in index mode, and a name server also runs. Such a host is referred to as a preprocessor host.
The graphic below depicts a system with one master host, two slave hosts, and one preprocessor host. The preprocessor host supports the master host in preprocessing.