dosubot[bot] commented on issue #2626:
URL: 
https://github.com/apache/incubator-hugegraph/issues/2626#issuecomment-2272543119

   <!-- Answer -->
   L1 缓存和 L2 缓存的不同之处在于它们的层级和容量管理方式:
   
   1. **L1 缓存**:
      - 位于缓存层级的第一层,通常容量较小。
      - 直接从缓存管理器中获取,使用 `CacheManager.instance().cache(name, capacity)` 方法创建。
      - 适用于需要快速访问的小容量数据。
   
   2. **L2 缓存**:
      - 位于缓存层级的第二层,通常容量较大。
      - 使用 `CacheManager.instance().levelCache(super.graph(), name, 
heapCapacity, capacity, entrySize)` 方法创建,其中 `heapCapacity` 是 L1 
缓存的容量,`capacity` 是 L2 缓存的总容量。
      - 适用于需要存储大量数据并且访问频率较低的数据。
   
   最佳使用场景:
   - **L1 缓存**:适用于频繁访问的小数据集,例如热点数据。
   - **L2 缓存**:适用于较大数据集,访问频率较低,但仍需要缓存以提高性能的数据。
   
   支持代码片段:
   ```java
   private Cache<Id, Object> cache(String prefix, String type, long capacity,
                                   long entrySize, long expire) {
       String name = prefix + "-" + this.params().name();
       Cache<Id, Object> cache;
       switch (type) {
           case "l1":
               cache = CacheManager.instance().cache(name, capacity);
               break;
           case "l2":
               long heapCapacity = (long) (DEFAULT_LEVEL_RATIO * capacity);
               cache = CacheManager.instance().levelCache(super.graph(),
                                                          name, heapCapacity,
                                                          capacity, entrySize);
               break;
           default:
               throw new NotSupportException("cache type '%s'", type);
       }
       // Convert the unit from seconds to milliseconds
       cache.expire(expire * 1000L);
       // Enable metrics for graph cache by default
       cache.enableMetrics(true);
       return cache;
   }
   ```
   
<sup>[[1]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/cache/CachedGraphTransaction.java)</sup>
   
   
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