Ehcache磁盘存储不干净关机 [英] Ehcache disk store unclean shutdown

问题描述

我正在使用具有磁盘存储持久性的缓存。在应用程序的后续重新运行中，我收到以下错误：

I'm using a cache with disk store persistence. On subsequent reruns of the app I'm getting the following error:

net.sf.ehcache.store.DiskStore deleteIndexIfCorrupt
WARNING: The index for data file MyCache.data is out of date,
probably due to an unclean shutdown. Deleting index file MYCache.index

除了明确调用<$ c $之外，还有什么办法可以解决这个问题c> net.sf.ehcache.CacheManager.shutdown（）在应用程序的某个地方？

Is there any way to fix that apart from explicitly calling net.sf.ehcache.CacheManager.shutdown() somewhere in the app?

缓存配置：

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="ehcache.xsd"
             updateCheck="true" monitoring="autodetect">

    <diskStore path="C:\work"/>

    <cacheManagerEventListenerFactory class="" properties=""/>

    <cacheManagerPeerProviderFactory
            class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory"
            properties="peerDiscovery=automatic,
                        multicastGroupAddress=230.0.0.1,
                        multicastGroupPort=4446, timeToLive=1"
            propertySeparator=","
            />

    <cacheManagerPeerListenerFactory
            class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory"/>

    <defaultCache
            maxElementsInMemory="1"
            eternal="false"
            timeToIdleSeconds="0"
            timeToLiveSeconds="86400"
            overflowToDisk="true"
            diskSpoolBufferSizeMB="1"
            maxElementsOnDisk="10000"
            diskPersistent="true"
            diskExpiryThreadIntervalSeconds="120"
            memoryStoreEvictionPolicy="LFU"
            />

</ehcache>

复制问题的代码：

import java.util.ArrayList;
import java.util.List;

import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;

public class CacheTest {
    static CacheManager manager = new CacheManager(CacheTest.class
            .getResource("ehcache.xml"));
    static Cache cache;

    public static void main(String[] args) {

        // Get a default instance
        manager.addCache("test");
        cache = manager.getCache("test");

        // Generate some junk so that the
        // cache properly flushes to disk
        // as cache.flush() is not working
        List<String> t = new ArrayList<String>();
        for (int i = 0; i < 1000; i++)
            t.add(null);
        // Oddly enough fewer elements
        // do not persist to disk or give
        // an error
        for (int i = 0; i < 100000; i++) {
            cache.put(new Element(i, t));
        }
        cache.flush();

        if (cache.get("key1") == null) {
            System.out.println("key1 not found in cache!");
            cache.put(new Element("key1", "value1"));
        }

        System.out.println(cache.get("key1"));
    }
}

推荐答案

尝试设置系统属性：
net.sf.ehcache.enableShutdownHook = true

因此，您可以添加以下行你的程序的开头：
System.setProperty（net.sf.ehcache.enableShutdownHook，true）;

So, either you can add the following line in the beginning of your program: System.setProperty("net.sf.ehcache.enableShutdownHook","true");

或者，从命令行传递属性：
java -Dnet.sf.ehcache.enableShutdownHook = true ...

Or, from the command line to pass the property: java -Dnet.sf.ehcache.enableShutdownHook=true ...

注意，使用此关闭钩子时，ehcache网站确实提到了一些注意事项：
关闭Ehcache

Note, the ehcache website does mention some caution when using this shutdown hook: Shutting Down Ehcache

当关闭钩子运行时，当它不会

关闭钩子在以下时间运行：

The shutdown hook runs when:

• 程序正常存在。例如调用System.exit（），或者最后一个非守护程序线程退出


• 虚拟机终止。例如CTRL-C。这对应于kill -SIGTERM pid或在Unix系统上杀死
  -15 pid。

关闭钩子不会在：

• 虚拟机中止


• 在Unix上将SIGKILL信号发送到虚拟机进程系统。例如kill -SIGKILL
  pid或kill -9 pid


• TerminateProcess调用被发送到Windows系统上的进程。

希望它有效：）

这篇关于Ehcache磁盘存储不干净关机的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！