Limiting I/O usage
As you might know, the Lucene index is divided into smaller pieces called segments, and each segment is stored on disk. Depending on the indexing and merge policy settings, Lucene, from time to time, merges two or more segments into a new one. This operation requires reading the old segments and writing a new one with the information from the old segments. The merges can happen at the same time when Solr indexes data and queries are run. The same goes for writing the segments; it can be pretty expensive when it comes to I/O usage. It is because of this that Solr allows us to configure the limits for I/O usage. This recipe will show you how to do this.
Getting ready
Before continuing further with this recipe, read the Choosing ...
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