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The preprocessors can run in the following different modes:

  • search mode

    The preprocessor only preprocesses search queries. In this mode the preprocessor runs on the slave hosts by default.

  • index mode

    The preprocessor only preprocesses documents. In this mode the preprocessor runs on the master hosts by default.

  • any mode

    The preprocessor's tasks are not restricted.

The modes merely define preferences for the distribution of tasks for the preprocessors. If necessary, a preprocessor carries out all tasks regardless of its mode. For example, in certain circumstances a preprocessor that runs in index mode also processes search queries. This behavior increases the availability of the system, because in principle all preprocessors are able to carry out all tasks.