What it contains ? So let’s start with information about the information that documentCache holds. So documentCache contain Lucene documents that were fetched from the index. So little and so much. What it is used for ? Every object (Lucene document) stored in documentCache contains a list of references to the fields, that are stored with the document. Thanks to this, when a document is fetched and put into the cache it doesn’t have to be fetched again while processing another query. And this is why the number of I/O operations is reduces when rendering the query results list.
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