Hazelcast缓存未根据<time-to-live-seconds>逐出

Question

我们配置<time-to-live-seconds>为1200(20分钟)但缓存在缓存创建时间一分钟后自动逐出.

有人可以告诉如何在指定的时间段内使缓存生效吗？

Answer 1

在片段下方hazelcast.xml将time-to-live-seconds"simpleMap"中条目的属性设置为150秒.超过150秒且未更新150秒的条目将自动从地图中逐出.

<map name="simpleMap">
    <backup-count>0</backup-count>
    <max-idle-seconds>0</max-idle-seconds>
    <eviction-policy>LRU</eviction-policy>
    <time-to-live-seconds>30</time-to-live-seconds>
    <max-size>3000</max-size>
    <eviction-percentage>30</eviction-percentage>
    <merge-policy>com.hazelcast.map.merge.PutIfAbsentMapMergePolicy</merge-policy>
</map>

我已经将一个条目监听器(如果使用ver3.5,请使用MapListener接口)附加到"simpleMap"以进行测试,只要条目被从地图中逐出,就会打印密钥和值.

public static void main(String[] args) 
{
    HazelcastInstance instance = HazelcastHelper.getHazelcastInstance();
    IMap<String, String> map = instance.getMap("simpleMap");
    map.addEntryListener(new SimpleMapEntryListener(), true);

    map.put("evictme", "value");
    printTime();
    try {
        Thread.sleep(1000 * 60);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    printTime();
}

private static void printTime()
{
    Calendar cal = Calendar.getInstance();
    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
    System.out.println( sdf.format(cal.getTime()) );
}

class SimpleMapEntryListener implements EntryListener<String, String>
{

    @Override
    public void entryEvicted(EntryEvent<String, String> arg0) 
    {
        System.out.println("Key : " + arg0.getKey() + " Value: " + arg0.getOldValue() + " evicted.");
        // print current time here.
    }
    // Add other overriden methods.

}

如果执行上面给出的代码,您可以看到条目<"evictme","value">仅在30秒后自动逐出.

您可能还需要检查max-idle-seconds配置(参见上面的示例,它设置为零,这意味着无限).max-idle-seconds如果设置(即不为零),则缓存将根据其被逐出.