terracotta 上的 ehcache 客户端故障转移

Question

我正在尝试将 OSS Ehcache 与 terracotta 集群一起使用，但未能从 ehcache 客户端实现故障转移。

我发现此配置如文档here中所述

<ehcache:service>
<terracotta:cluster>
  <terracotta:connection url="terracotta://localhost:9510/clustered"/>
  <terracotta:server-side-config auto-create="true">
    <terracotta:default-resource from="default-resource"/>
  </terracotta:server-side-config>
</terracotta:cluster>
</ehcache:service>    

但此连接只接受一个 URL。如果集群中有两台 terracotta 服务器，我想要 HA 和故障转移。 类似于 ActiveMQ 故障转移网址：

failover:(server1:port,server2:port)

我的问题：在开源 ehcache 中是否可能，或者我需要企业版，如果可能，如何配置。

更新

我试过了 <terracotta:connection url="terracotta://host1:9510,host2:9610/clustered1"/> 正如Louis Jacomet 提到的那样，但是没有正确解析，给出：

org.ehcache.xml.exceptions.XmlConfigurationException: Error parsing XML configuration at file:/F:/Work/WORKSPACES/java7_ws/CachingTest/target/classes/ehcache.xml
    at org.ehcache.xml.XmlConfiguration.<init>(XmlConfiguration.java:167)
    at org.ehcache.xml.XmlConfiguration.<init>(XmlConfiguration.java:131)
    at org.ehcache.jsr107.EhcacheCachingProvider$ConfigSupplier.getConfiguration(EhcacheCachingProvider.java:324)
    ... 4 more
Caused by: org.xml.sax.SAXParseException; systemId: file:/F:/Work/WORKSPACES/java7_ws/CachingTest/target/classes/ehcache.xml; lineNumber: 12; columnNumber: 91; cvc-pattern-valid: Value 'terracotta://host1:9510,host2:9610/clustered1' is not facet-valid with respect to pattern '\w+://([^\]\[/?#@]+@)?[^:?#/]+(:[1-9][0-9]{0,4})?(/[^\?#]*)?(\?[^#]*)?(#.*)?' for type 'connectionUrl'.

如果我尝试编译好的<terracotta:connection url="terracotta://host1:9510/clustered1,host2:9610/clustered1"/>，但如果 host1 出现故障，客户端会给出：

Exception in thread "main" org.ehcache.StateTransitionException: org.terracotta.connection.ConnectionException: java.util.concurrent.TimeoutException
    at org.ehcache.core.StatusTransitioner$Transition.failed(StatusTransitioner.java:235)
    at org.ehcache.core.EhcacheManager.init(EhcacheManager.java:588)
    at org.ehcache.jsr107.EhcacheCachingProvider.createCacheManager(EhcacheCachingProvider.java:148)
    at org.ehcache.jsr107.EhcacheCachingProvider.getCacheManager(EhcacheCachingProvider.java:128)
    at org.ehcache.jsr107.EhcacheCachingProvider.getCacheManager(EhcacheCachingProvider.java:79)
    at org.ehcache.jsr107.EhcacheCachingProvider.getCacheManager(EhcacheCachingProvider.java:183)
    at dev.ams.poc.CacheApp.main(CacheApp.java:15)
Caused by: java.lang.RuntimeException: org.terracotta.connection.ConnectionException: java.util.concurrent.TimeoutException
    at org.ehcache.clustered.client.internal.service.DefaultClusteringService.initClusterConnection(DefaultClusteringService.java:189)
    at org.ehcache.clustered.client.internal.service.DefaultClusteringService.start(DefaultClusteringService.java:140)
    at org.ehcache.core.internal.service.ServiceLocator.startAllServices(ServiceLocator.java:118)
    at org.ehcache.core.EhcacheManager.init(EhcacheManager.java:560)
    ... 5 more

Ehcache 版本：Ehcache-clustered-3.2

Answer 1

此功能是开源产品的一部分，没有问题。

您需要在其中列出多个server:port，如：

<ehcache:service>
  <terracotta:cluster>
    <terracotta:connection url="terracotta://localhost:9510,otherhost:9510/clustered"/>
    <terracotta:server-side-config auto-create="true">
      <terracotta:default-resource from="default-resource"/>
    </terracotta:server-side-config>
  </terracotta:cluster>
</ehcache:service> 

列出所有服务器是推荐的方法，否则您需要非常准确地了解故障转移逻辑。