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28.2. L1 Cache Configuration
28.2.1. L1 Cache Configuration (Library Mode)
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The following sample configuration shows the L1 cache default values in Red Hat JBoss Data Grid's Library Mode.
Example 28.1. L1 Cache Configuration in Library Mode
<distributed-cache name="distributed_cache"
owners="2"
l1-lifespan="0"
l1-cleanup-interval="60000"/>
<distributed-cache name="distributed_cache"
owners="2"
l1-lifespan="0"
l1-cleanup-interval="60000"/>
The following attributes control the L1 cache behavior:
- The
l1-lifespanattribute indicates the maximum lifespan in milliseconds of entries placed in the L1 cache, and is not allowed in non-distributed caches. By default L1 this value is 0, indicating that L1 caching is disabled, and is only enabled if a positive value is defined. - The
li-cleanup-intervalparameter controls how often a cleanup task to prune L1 tracking data is run, in milliseconds, and by default is defined to 10 minutes.
The following sample configuration shows the L1 cache default value of
0, indicating it is disabled, in Red Hat JBoss Data Grid's Remote Client-Server mode:
Example 28.2. L1 Cache Configuration for Remote Client-Server Mode
<distributed-cache l1-lifespan="0"> <!-- Additional configuration information here --> </distributed-cache>
<distributed-cache l1-lifespan="0">
<!-- Additional configuration information here -->
</distributed-cache>
The
l1-lifespan element is added to a distributed-cache element to enable L1 caching and to set the life span of the L1 cache entries for the cache. This element is only valid for distributed caches.
If
l1-lifespan is set to 0 or a negative number (-1), L1 caching is disabled. L1 caching is enabled when the l1-lifespan value is greater than 0.
Important
When the cache is accessed remotely via the Hot Rod protocol, the client accesses the owner node directly. Therefore, using L1 Cache via the Hot Rod protocol is not recommended; instead, refer to the Near Caching section in the JBoss Data Grid Developer Guide. Other remote clients (Memcached, REST) cannot target the owner, therefore, using L1 Cache may increase the performance (at the cost of higher memory consumption).
Note
In Remote Client-Server mode, the L1 cache was enabled by default when distributed cache was used, even if the
l1-lifespan attribute is not set. The default lifespan value was 10 minutes. Since JBoss Data Grid 6.3, the default lifespan is 0 which disables the L1 cache. Set a non-zero value for the l1-lifespan parameter to enable the L1 cache.
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