3.3. Using Eviction


In Red Hat JBoss Data Grid, eviction is disabled by default. If an empty <eviction /> element is used to enable eviction without any strategy or maximum entries settings, the following default values are automatically implemented:
  • Strategy: If no eviction strategy is specified, EvictionStrategy.NONE is assumed as a default.
  • max-entries/maxEntries: If no value is specified, the max-entries/maxEntries value is set to -1, which allows unlimited entries.

3.3.1. Initialize Eviction

To initialize eviction, set the eviction element's max-entries attributes value to a number greater than zero. Adjust the value set for max-entries to discover the optimal value for your configuration. It is important to remember that if too large a value is set for max-entries, Red Hat JBoss Data Grid runs out of memory.
The following procedure outlines the steps to initialize eviction in JBoss Data Grid:

Procedure 3.1. Initialize Eviction

  1. Add the Eviction Tag

    Add the <eviction> tag to your project's <cache> tags as follows:
    <eviction />
    
  2. Set the Eviction Strategy

    Set the strategy value to set the eviction strategy employed. Possible values are LRU, UNORDERED and LIRS (or NONE if no eviction is required). The following is an example of this step:
    <eviction strategy="LRU" />
    
  3. Set the Maximum Entries

    Set the maximum number of entries allowed in memory. The default value is -1 for unlimited entries.
    1. In Library mode, set the maxEntries parameter as follows:
      <eviction strategy="LRU" maxEntries="200" />
      
    2. In Remote Client Server mode, set the max-entries as follows:
      <eviction strategy="LRU" max-entries="200" />
      
Result

Eviction is configured for the target cache.

Red Hat logoGithubRedditYoutubeTwitter

Learn

Try, buy, & sell

Communities

About Red Hat Documentation

We help Red Hat users innovate and achieve their goals with our products and services with content they can trust.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. For more details, see the Red Hat Blog.

About Red Hat

We deliver hardened solutions that make it easier for enterprises to work across platforms and environments, from the core datacenter to the network edge.

© 2024 Red Hat, Inc.