0

我们在 Spring Boot 应用程序中使用 ehcache。我们的 spring boot 版本是 2.0.3.RELEASE 并且 spring-boot-starter-cache 2.0.3.RELEASE 使用 ehcache 3.5.2。

我们使用 ehcache 的动机是它既兼容 jsr107 又提供堆外支持。

下面是我们的弹簧配置：

@Configuration
@ConditionalOnWebApplication
@EnableCaching
public class CacheConfig {
    @Autowired
    private ApplicationContext context;

    @Bean
    public JCacheManagerFactoryBean jCacheManagerFactoryBean() throws IOException {
        JCacheManagerFactoryBean jCacheManagerFactoryBean = new JCacheManagerFactoryBean();
        Resource resource = context.getResource("classpath:mts/ehcache.xml");
        jCacheManagerFactoryBean.setCacheManagerUri(resource.getURI());
        return jCacheManagerFactoryBean;
    }

    @Bean
    public JCacheCacheManager ehCacheCacheManager() throws IOException {
        Properties props = System.getProperties();
        props.setProperty(Caching.JAVAX_CACHE_CACHING_PROVIDER, "org.ehcache.jsr107.EhcacheCachingProvider");
        JCacheCacheManager jCacheCacheManager = new JCacheCacheManager();
        jCacheCacheManager.setCacheManager(jCacheManagerFactoryBean().getObject());
        jCacheCacheManager.setTransactionAware(true);
        return jCacheCacheManager;

    }

}

我们在生产中面临的问题是，对于中等大小的磁盘持久缓存，我们在 removeAll 操作中出现以下 java.io.EOFException 错误：

Error : RuntimeException: java.io.EOFException 
java.lang.RuntimeException: java.io.EOFException
        at org.terracotta.offheapstore.disk.storage.FileBackedStorageEngine$FileChunk.readKeyBuffer(FileBackedStorageEngine.java:541) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.disk.storage.FileBackedStorageEngine.readKeyBuffer(FileBackedStorageEngine.java:265) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.storage.PortabilityBasedStorageEngine.readKey(PortabilityBasedStorageEngine.java:119) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.OffHeapHashMap$DirectEntry.<init>(OffHeapHashMap.java:1540) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.OffHeapHashMap$EntryIterator.create(OffHeapHashMap.java:1518) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.OffHeapHashMap$EntryIterator.create(OffHeapHashMap.java:1511) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.OffHeapHashMap$HashIterator.next(OffHeapHashMap.java:1407) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.AbstractLockedOffHeapHashMap$LockedEntryIterator.next(AbstractLockedOffHeapHashMap.java:399) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.AbstractLockedOffHeapHashMap$LockedEntryIterator.next(AbstractLockedOffHeapHashMap.java:392) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.terracotta.offheapstore.concurrent.AbstractConcurrentOffHeapMap$AggregateIterator.next(AbstractConcurrentOffHeapMap.java:553) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.ehcache.impl.internal.store.offheap.AbstractOffHeapStore$1.next(AbstractOffHeapStore.java:499) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.ehcache.impl.internal.store.offheap.AbstractOffHeapStore$1.next(AbstractOffHeapStore.java:489) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.ehcache.core.EhcacheBase$Jsr107CacheBase.removeAll(EhcacheBase.java:708) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.ehcache.jsr107.Eh107Cache.removeAll(Eh107Cache.java:304) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at com.mycompany.myproject.services.cache.service.impl.CacheService.doClearCacheWithName(CacheService.java:56) ~[MyProjectServicesCache_classes.jar!/:?]

调用 removeAll 操作的代码没有什么特别之处。只需获取带有名称的缓存并调用 clear all：

private void doClearCacheWithName(String cacheName) {
    Cache<Object, Object> cache = cacheManager.getCache(cacheName);
    if (cache == null) {
        throw new MyProjectException(String.format("Cache with name : %s does not exist!", cacheName));
    }
    logger.info(String.format("Clearing cache with name : %s", cacheName));
    cache.removeAll();
}

这是 ourBigCache 的生产配置：

<cache alias="ourBigCache">
        <expiry>
            <ttl unit="seconds">21600</ttl> 
        </expiry>
        <resources>
            <heap unit="entries">1000</heap>
            <disk unit="MB">4096</disk>
        </resources>
    </cache>

我们无法在本地或测试环境中重现这一点。

请注意，此缓存的使用率非常高（生产中的读取计数非常高），但我想这不会有任何区别。

我找不到任何类似的报告问题。有一些非常古老的磁盘问题被提及，但它们太旧且不相似：

https://sourceforge.net/p/ehcache/discussion/322278/thread/e7a62df3/ http://forums.terracotta.org/forums/posts/list/2694.page

任何帮助将不胜感激。

问候

4

1 回答 1

1

复制自我对 ehcache-users 的回复：

这很可能只是https://github.com/ehcache/ehcache3/issues/2542的另一个症状，已在 74239a93e14eb7477841fffa36c971ef9e930686 中修复

不幸的是，此修复尚未在任何地方合并。如果你想选择这个，你可以削减你自己的 master 构建（这可能是一件好事来验证）。否则，您将不得不等待 3.7 线上的第一个 dot-release（此时时间线未知）。

克里斯

于 2019-03-11T15:08:25.437 回答