Ehcache无法在XA模式下将数据溢出到磁盘(NotSerializableException)

问题描述

我正在使用Ehcache进行XA事务处理.目前，我正在使用Spring事务管理和Bitronix作为事务管理器.

我使用以下方法创建，配置和填充缓存:

  @Transactional公共无效createCache(){this.cacheConfiguration = new CacheConfiguration("MyCache"，5000).diskPersistent(false).eternal(false).diskExpiryThreadIntervalSeconds(1).maxElementsInMemory(70).transactionalMode(TransactionalMode.XA);最终配置config = new Configuration();config.setDefaultCacheConfiguration(this.cacheConfiguration);最后的DiskStoreConfiguration diskStoreConfiguration = new DiskStoreConfiguration();diskStoreConfiguration.setPath("cache");config.addDiskStore(diskStoreConfiguration);this.cacheManager = new CacheManager(config);this.cacheConfiguration.name("primaryCache");this.cache =新的Cache(this.cacheConfiguration);this.cacheManager.addCache(this.cache);对于(int i = 0; i< 100; i ++){最终的Integer值= Integer.valueOf(i);this.cache.put(new Element(value，value));}} 

一切正常，Ehcache的运行正常，超过了70个被逐出的元素.

现在，如果我将 diskPersistent 从 false 更改为 true ，则当Ehcache尝试将某些元素复制到磁盘时，该功能将无法正常工作存储，但以下情况除外:

  [primaryCache.data]错误n.s.e.s.c.f.DiskStorageFactory btm-gtrid = 737072696E672D62746D0000012F9296448C00000000-磁盘写入0失败(它将被逐出):java.io.NotSerializableException:net.sf.ehcache.transaction.ReadCommittedSoftLockImpl 

这是预期，因为将Ehcache切换为事务模式会使其将 Integer 类型的原始值替换为 SoftLock :

  [main]调试n.s.e.t.local.LocalTransactionStore ehcache-txid = 0，btm-gtrid = 737072696E672D62746D0000012F9296448C00000000-放置:缓存[primaryCache]密钥[0]不在，已插入软锁 

为完整起见，这在使用Atomikos事务管理器时也会发生，并且在不使用XA模式时也可以正常工作.

问题是:有没有办法混合XA事务和磁盘溢出?

解决方案

一切都应按您预期的方式运行，但是您刚刚发现了一个错误，该错误完全阻止了开源磁盘持久性存储以任何事务模式工作./p>

请在Ehcache JIRA(https://jira.terracotta.org/jira/browse/EHC)中报告该问题，我们将尽快解决.

I'm experimenting XA transactions with Ehcache. Currently I'm using Spring transaction management and Bitronix as transaction manager.

I create, configure and fill up a cache using the method below:

@Transactional
public void createCache() {
    this.cacheConfiguration = new CacheConfiguration("MyCache", 5000).diskPersistent(false).eternal(false)
            .diskExpiryThreadIntervalSeconds(1).maxElementsInMemory(70).transactionalMode(TransactionalMode.XA);
    final Configuration config = new Configuration();
    config.setDefaultCacheConfiguration(this.cacheConfiguration);
    final DiskStoreConfiguration diskStoreConfiguration = new DiskStoreConfiguration();
    diskStoreConfiguration.setPath("cache");
    config.addDiskStore(diskStoreConfiguration);
    this.cacheManager = new CacheManager(config);
    this.cacheConfiguration.name("primaryCache");
    this.cache = new Cache(this.cacheConfiguration);
    this.cacheManager.addCache(this.cache);

    for (int i = 0; i < 100; i++) {
        final Integer value = Integer.valueOf(i);
        this.cache.put(new Element(value, value));
    }
}

Everything is working fine and Ehcache works as expected by evicted elements over the count of 70.

Now if I change diskPersistent from false to true, it does not work as soon as Ehcache attempt to copy some element to the disk storage with the following exception:

[primaryCache.data] ERROR n.s.e.s.c.f.DiskStorageFactory btm-gtrid=737072696E672D62746D0000012F9296448C00000000 - Disk Write of 0 failed (it will be evicted instead): 
java.io.NotSerializableException: net.sf.ehcache.transaction.ReadCommittedSoftLockImpl

This is expected as switching Ehcache to transactional mode makes it replace the original values of Integertype by a SoftLock:

[main] DEBUG n.s.e.t.local.LocalTransactionStore ehcache-txid=0, btm-gtrid=737072696E672D62746D0000012F9296448C00000000 - put: cache [primaryCache] key [0] was not in, soft lock inserted

To be complete, this also happens when using the Atomikos transaction manager and works flawlessly when not using XA mode.

The question is: is there a way to mix XA transactions and disk overflow ?

解决方案

Everything should work as you expect them to but you've just found a bug which completely prevents the Open Source disk persistent store from working with any transactional mode.

Please report the problem in the Ehcache JIRA (https://jira.terracotta.org/jira/browse/EHC) and we'll fix it as soon as we can.

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