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。

我在文档here

中找到了此配置

<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。如果群集中有两个兵马俑服务器，我希望HA具有故障转移功能。像ActiveMQ故障转移网址：

failover:(server1:port,server2:port)

我的问题：这是否可以在opensource ehcache中使用，或者我需要拥有企业版，如果可能的话，如何配置它。

更新

我试过了 <terracotta:connection url="terracotta://host1:9510,host2:9610/clustered1"/> 正如Louis Jacomet所提到的，但没有正确解析，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'.

如果我尝试编译良好的<terracotta:connection url="terracotta://host1:9510/clustered1,host2:9610/clustered1"/>，但如果 host1 发生故障，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>

建议列出所有服务器，否则您需要非常准确地了解故障转移逻辑。

ehcache客户端在兵马俑上进行故障转移

1 个答案: