Re: [I] 如何在请问在图数据库中如何禁用点和边的缓存功能？尽管尝试修改了 vertex.cache_expire 和 vertex.cache_capacity 配置项，但似乎无法实现完全禁用缓存。 [incubator-hugegraph]

Tue, 06 Aug 2024 19:50:12 -0700 


dosubot[bot] commented on issue #2626:
URL: 
https://github.com/apache/incubator-hugegraph/issues/2626#issuecomment-2272515931

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   要在 HugeGraph 图数据库中完全禁用点和边的缓存功能，可以通过配置文件进行设置。以下是一个可能的配置示例：
   
   ```yaml
   # conf/hugegraph.properties
   
   # Disable vertex cache
   cache.vertex.capacity=0
   cache.vertex.expire=0
   
   # Disable edge cache
   cache.edge.capacity=0
   cache.edge.expire=0
   ```
   
   将 `cache.vertex.capacity` 和 `cache.edge.capacity` 设置为 `0`，并将 
`cache.vertex.expire` 和 `cache.edge.expire` 设置为 
`0`，可以有效地禁用顶点和边的缓存功能<sup>[[1]](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/cn/docs/changelog/hugegraph-0.11.2-release-notes.md)</sup>。
   
   此外，代码注释中也解释了当 `cache.vertex.capacity` 和 `cache.edge.capacity` 设置为 `0` 时的默认行为：
   
   ```java
   public static final ConfigOption<Long> VERTEX_CACHE_CAPACITY =
           new ConfigOption<>(
                   "vertex.cache_capacity",
                   "The max cache size(items) of vertex cache.",
                   rangeInt(0L, Long.MAX_VALUE),
                   (1000 * 1000 * 10L)
           );
   
   public static final ConfigOption<Long> EDGE_CACHE_CAPACITY =
           new ConfigOption<>(
                   "edge.cache_capacity",
                   "The max cache size(items) of edge cache.",
                   rangeInt(0L, Long.MAX_VALUE),
                   (1000 * 1000 * 1L)
           );
   ```
   
   `rangeInt(0L, Long.MAX_VALUE)` 表示容量可以设置为 `0`，这意味着可以通过将容量设置为 `0` 
来禁用缓存<sup>[[2]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/config/CoreOptions.java)</sup>。
   
   当缓存被禁用时，所有读写操作将直接与底层存储后端（如 
RocksDB）进行交互，而不会使用任何内存缓存层<sup>[[3]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-rocksdb/src/main/java/org/apache/hugegraph/backend/store/rocksdb/RocksDBOptions.java)</sup><sup>[[4]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-store/hg-store-core/src/main/java/org/apache/hugegraph/store/options/RaftRocksdbOptions.java)</sup>。
   
   
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