The Terracotta Server provides powerful distributed in-memory data management capabilities for Terracotta products (such as Ehcache and TCStore) and is the backbone for Terracotta clusters.

A Terracotta Server Array can vary from a basic two-node tandem to a multi-node array (Terracotta Server Array (TSA)) providing configurable scale, high performance, and deep failover coverage.

Add distributed caching capabilities to your Ehcache deployment today!

Terracotta additionally offers various other open source projects and code libraries which may be of interest.

Some key features of the Terracotta Server include:

Advanced features such as fast-restart persistence, advanced management features and security are available in commercially supported versions from Software AG.

Getting Started with Terracotta Clustering

Installing and using Terracotta is as easy as downloading the kit and ensuring that the correct files are on your application’s classpath for the client components like Ehcache, and then start the server. The only platform requirement is using JDK 1.8 or higher.

Starting a Terracotta Server

1 - Download the Terracotta Server

The Terracotta Server can be either downloaded as part of the Ehcache clustered kit or as a Docker image.

Please see the download page to get the latest kit or Docker image.

If the kit is downloaded, then unpack it with the appropriate decompression application. The kit is packaged as a .tar.gz file.

2 - Start the Terracotta Server

Local Kit:

Assuming that you have the clustered Ehcache kit available locally, start with extracting the ehcache-clustered kit. Change to your extracted directory and then execute the start-tc-server script as below to start the Terracotta server with the above configuration:

cd <path/to/terracotta/kit>/server/bin

# On Windows:
start-tc-server.bat -auto-activate -cluster-name tc-cluster -offheap-resources=offheap-1:512MB,offheap-2:512M

# On Unix / Mac:
./start-tc-server.sh -auto-activate -cluster-name tc-cluster -offheap-resources=offheap-1:512MB,offheap-2:512M

Please pay attention that the command-line supports a lot of settings, which, by default, are locating the server data and logs inside your home folder at: ~/terracotta

With Docker:

docker run --rm -it --publish 9410:9410 -e DEFAULT_ACTIVATE=true terracotta/ehcache-terracotta-server:3.10.8

Verification:

Check for the below INFO log to confirm if the server started successfully,

Terracotta Server instance has started up as ACTIVE node on all interfaces (address:/0.0.0.0 port:9410) successfully, and is now ready for work..

Starting a clustered Ehcache client

1 - Setup the classpath

Add the following JAR (Ehcache API) from within the kit to your application’s classpath (if they are not already there):

  • client/ehcache/ehcache-3.x.y.jar

  • client/ehcache/ehcache-clustered-3.x.y.jar

2 - Run a sample clustered client

This sample will connect to the server, put a key-value in a cache and then retrieve it.

In Java:

try(PersistentCacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder()
  .with(ClusteringServiceConfigurationBuilder.cluster(URI.create("terracotta://localhost:9410/my-cache-manager-name"))
    .autoCreateOnReconnect(server -> server.defaultServerResource("offheap-1")))

  .withCache("cache", CacheConfigurationBuilder.newCacheConfigurationBuilder(Long.class, String.class,
    ResourcePoolsBuilder.newResourcePoolsBuilder()
      .with(ClusteredResourcePoolBuilder.clusteredDedicated("offheap-1", 8, MemoryUnit.MB))))

  .build(true)) {

  Cache<Long, String> cache = cacheManager.getCache("cache", Long.class, String.class);

  cache.put(1L, "one");
  assertThat(cache.get(1L), equalTo("one"));
}

In XML:

Create an ehcache.xml configuration file:

<?xml version="1.0" encoding="UTF-8"?>

<ehcache:config
    xmlns:ehcache="http://www.ehcache.org/v3"
    xmlns:tc="http://www.ehcache.org/v3/clustered">

  <ehcache:service>
    <tc:cluster>
      <tc:connection url="terracotta://localhost:9410/my-cache-manager-name"/>
      <tc:server-side-config client-mode="auto-create"/>
    </tc:cluster>
  </ehcache:service>

  <ehcache:cache alias="cache">
    <ehcache:key-type>java.lang.Long</ehcache:key-type>
    <ehcache:value-type>java.lang.String</ehcache:value-type>

    <ehcache:resources>
      <tc:clustered-dedicated from="offheap-1" unit="MB">8</tc:clustered-dedicated>
    </ehcache:resources>
  </ehcache:cache>

</ehcache:config>

Then the following code will load the XML configuration and connects to the server:

try(CacheManager cacheManager = CacheManagerBuilder.newCacheManager(new XmlConfiguration(new File("ehcache.xml").toURI().toURL()))) {
  cacheManager.init();

  Cache<Long, String> cache = cacheManager.getCache("cache", Long.class, String.class);
  cache.put(1L, "one");
  assertThat(cache.get(1L), equalTo("one"));
}

More information

Read the user documentation for everything you’ve been wondering about the new API!