dosubot[bot] commented on issue #2719:
URL:
https://github.com/apache/incubator-hugegraph/issues/2719#issuecomment-2574498138
<!-- Answer -->
Updating vertex attributes should trigger edge cache invalidation because
edges often depend on the properties of their connected vertices. If the edge
cache is not invalidated, it can lead to inconsistencies where the cached edges
do not reflect the updated state of the vertices they connect, causing
incorrect query results or application logic errors.
For example, consider a test case where two vertices `v1` and `v2` are
connected by an edge. Initially, the edge cache is populated with this edge. If
a property of vertex `v1` is updated (e.g., adding a property "name" with value
"test-name"), the edge cache is invalidated to ensure that subsequent queries
reflect the updated vertex properties.
If the edge cache were not invalidated, querying the edges connected to `v1`
might return outdated information, such as the old vertex properties, leading
to potential errors in applications relying on this data. The test confirms
that after updating a vertex property, the edge cache size is reset to zero,
ensuring that the next query retrieves fresh data:
```java
cache.addVertexProperty(new HugeVertexProperty<>(v1,
cache.graph().schema()
.getPropertyKey("name"),
"test-name"));
cache.commit();
Assert.assertEquals(0L,
Whitebox.invoke(cache, "edgesCache", "size"));
String name = cache.queryEdgesByVertex(IdGenerator.of(1)).next().outVertex()
.value("name");
Assert.assertEquals("test-name", name);
```
This demonstrates the necessity of edge cache invalidation upon vertex
updates to maintain data consistency
<sup>[[1]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/unit/cache/CachedGraphTransactionTest.java)</sup>.
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