Ehcache

Question

我们在 spring 启动应用程序中使用了 ehcache。我们的 spring 引导版本是 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 的动机是它既符合 jsr107 标准又提供堆外支持。

下面是我们的 spring 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，对于大小适中的磁盘持久缓存，我们在 removeAll 操作中遇到以下 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.next(AbstractOffHeapStore.java:499) ~[ehcache-3.5.2.jar!/:3.5.2 7941fa2573343b31ae56a12564404552c6d6eff0]
        at org.ehcache.impl.internal.store.offheap.AbstractOffHeapStore.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。只需获取名称为缓存并调用全部清除：

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();
}

这是我们的 BigCache 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此内容。

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

我找不到任何类似的报告问题。提到了一些非常老的磁盘问题，但它们太老且不相似：

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

如有任何帮助，我们将不胜感激。

此致

Answer 1

从我对 ehcache-users 的回复中复制：

Most likely this is just another symptom of https://github.com/ehcache/ehcache3/issues/2542 which was fixed in 74239a93e14eb7477841fffa36c971ef9e930686

Unfortunately this fix hasn’t been merged anywhere yet. If you want to pick this up you could cut your own build of master (which would probably be a good thing to verify). Otherwise you'll have to wait for the first dot-release on the 3.7 line (timeline unknown at this point).

Chris

Ehcache - java.io.EOFException 用于 removeAll 操作的磁盘持久缓存

Ehcache - java.io.EOFException for disk persistent cache for removeAll operation

spring

spring-cache

ehcache-3