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Posted to issues@hugegraph.apache.org by "dosubot[bot] (via GitHub)" <gi...@apache.org> on 2026/05/05 14:30:32 UTC
Re: [I] [Bug] schema ~create_time userdata round-trips Date as String after cache reload [hugegraph]
dosubot[bot] commented on issue #3013:
URL: https://github.com/apache/hugegraph/issues/3013#issuecomment-4380257320
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Your analysis is correct. The root cause is that all backend serializers (Text, Binary, MySQL, Cassandra) deserialize userdata using `JsonUtil.fromJson(userdataStr, Map.class)`, which gives Jackson no type information about the values [[1]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/serializer/TextSerializer.java) [[2]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/serializer/BinarySerializer.java) [[3]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-mysql/src/main/java/org/apache/hugegraph/backend/store/mysql/MysqlSerializer.java) [[4]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-cassandra/src/main/java/org/apache/hugegraph/backend/st
ore/cassandra/CassandraSerializer.java). Even though a custom `DateDeserializer` is registered with format `"yyyy-MM-dd HH:mm:ss.SSS"` [[5]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/io/HugeGraphSONModule.java), it's only invoked when the target type is explicitly `Date.class` — not when deserializing to a raw `Map`.
During creation, `SchemaTransaction.setCreateTimeIfNeeded()` correctly stores a real `java.util.Date` via `DateUtil.now()` [[6]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/tx/SchemaTransaction.java#L87-L91), and the serialization side properly converts it to a formatted string. But on the read path, the string is never converted back.
The simplest fix would be to post-process userdata after deserialization — check for the `~create_time` key and convert the `String` value back to `Date` using `DateUtil.parse()` [[7]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-commons/hugegraph-common/src/main/java/org/apache/hugegraph/util/DateUtil.java#L32-L51). This would need to be applied in the `readUserdata()` path of each serializer (or in a shared utility). Multiple test cases already expect a `Date` return type and would throw `ClassCastException` otherwise [[8]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/VertexLabelCoreTest.java#L1220) [[9]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/PropertyKeyCoreTest.java#L669).
Worth noting: this bug likely existed before PR #3011 but was rarely observed in single-JVM deployments because the in-memory schema object (with the correct `Date` type) was typically used without needing a full backend reload.
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