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Posted to dev@hugegraph.apache.org by "dpol1 (via GitHub)" <gi...@apache.org> on 2026/08/08 08:15:34 UTC
[I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
dpol1 opened a new issue, #3145:
URL: https://github.com/apache/hugegraph/issues/3145
Follow-up to the discussion in #3110. @imbajin confirmed the testing and validation groundwork can start before any Rust decision, so this issue tracks the Java-only part: a selection matrix for the first PoC candidate and golden compatibility fixtures for the codec classes.
**Scope**
Three deliverables, all plain Java against the current build:
1. A selection matrix for PoC candidates (first cut below, to be refined in this thread).
2. A golden fixture corpus for `LongEncoding` plus a replay test that runs it against the current implementation.
3. Short written notes on the behavioral contract the fixtures lock down (edge cases, error behavior, invariants).
**Non-goals**
No Rust, no JNI, no Cargo, no packaging changes, no new Maven modules, no runtime wiring. Those wait for the component decision, a mentor, and a design review with contributors who have deeper Rust experience, as discussed in #3110.
**Selection matrix**
Criteria: an existing test oracle, enough call sites to matter, work per call big enough to survive a JNI crossing, and, following the maintainer feedback in #3110, keeping the Java implementation alive has to stay cheap, since graceful fallback is a requirement.
| Candidate | Oracle | Fallback cost | Notes |
|---|---|---|---|
| `LongEncoding` | `LongEncodingTest` (684 lines) | low, pure functions | output feeds storage keys, so the contract needs locking either way |
| `NumericUtil` | `NumericUtilTest` (475 lines) | low | coupled to `LongEncoding.encodeNumber`, candidate for the same corpus later |
| `BytesBuffer` | `BytesBufferTest` (1351 lines) | high | persisted format, 30+ callers, a fallback would have to stay byte-identical |
| `IntSet` / `IntMap` | `IntSetTest`, `IntMapTest` | high | concurrent structures on `Unsafe`, a live double implementation risks divergence |
With the fallback criterion the concurrent structures and the serializer drop out of round one. `LongEncoding` is the first fixture target. That is a choice about where to write fixtures first, not a decision that it becomes the Rust PoC.
**Fixture shape**
Plain ASCII, line-based (TSV with `\uXXXX` escapes for non-ASCII), checked into test resources so it needs no extra dependency to read. It covers: round trips across the full value range including `Long.MIN_VALUE`/`MAX_VALUE` (the encoding does intentional wrapping arithmetic), arbitrary UTF-16 input on the decode side (valid inputs are ASCII, invalid ones are not), the error cases (`IllegalArgumentException` vs `NumberFormatException` vs NPE on null), and the length limits.
The replay test is JUnit 4 and compiles at the Java 8 level, since that is the current `hugegraph-commons` baseline. Root is Java 11. Java 17 / commons Java 11 from #3117 are treated as declared targets, not assumptions.
**Acceptance**
- [ ] matrix reviewed in this thread
- [ ] corpus + replay test merged and running in the normal test suite
- [ ] contract notes written up here or in the PR
Owner: @dpol1. Mentor / Rust reviewer: TBD per #3110.
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "dpol1 (via GitHub)" <gi...@apache.org>.
dpol1 commented on issue #3145:
URL: https://github.com/apache/hugegraph/issues/3145#issuecomment-5779637268
@imbajin thanks for the references and the coverage correction. Confirmed: the corpus covers `encodeSortable`/`decodeSortable`, `encodeB64`/`decodeB64`, and `encodeSignedB64`/`decodeSignedB64`, never calls `encodeNumber`, and therefore pins nothing in `NumericUtil`. I corrected the matrix rows `LongEncoding`, `NumericUtil`, and `BytesBuffer` and the inventory in place, with a dated update block in the inventory, instead of adding another table. I ticked checkbox 2: #3146 is merged, and both tests run in the commons `UnitTestSuite`.
@SebastianGruza thanks for the #3090 data point. I checked the store side: the `SelectIterator`/`FilterIterator` parse path exists, but no current traffic reaches it (no production caller selects properties; details in the inventory update). The `BytesBuffer` row now states that the byte-identical constraint binds today on the server encoder and its own readers and becomes a cross-process contract only if #3090 re-enables store-side filtering. For the storage rows of the matrix, I will cite the #3223 baselines rather than produce my own.
Next step, towards the remaining checkbox (matrix reviewed): an RFC, filed as a child issue of #3110, that lets the maintainers decide whether and where a first Rust proof of concept in the Server is justified. It will cover:
- the inventory candidates, plus at most one non-codec candidate that meets the same criteria;
- three options side by side: an improved Java implementation, an in-process boundary, and an out-of-process boundary;
- crossing costs measured on our own code: single and batched calls, copy versus read semantics, varying sizes;
- the validation, packaging, and rollback sections the #3110 guardrails require.
It presupposes neither a component nor an advantage; "not justified yet" is an acceptable conclusion, and the document will say whether the evidence is missing or contrary. Target: ready for review in about a month, before the discussion after 1.8.0. No Rust code enters this repository before that review.
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #3145:
URL: https://github.com/apache/hugegraph/issues/3145#issuecomment-5401402518
Due to the lack of activity, the current issue is marked as stale and will be closed after 20 days, any update will remove the stale label
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "imbajin (via GitHub)" <gi...@apache.org>.
imbajin commented on issue #3145:
URL: https://github.com/apache/hugegraph/issues/3145#issuecomment-5719094030
## References: compatibility baselines and a later Java/Rust PoC
The Java-only groundwork here has useful precedents. `LongEncoding` remains the first fixture target; choosing a native component and demonstrating its value are later decisions.
### Shared fixtures, golden outputs and differential testing
| Reference | Existing practice | What is useful here |
|---|---|---|
| [SQLite — sqllogictest](https://www.sqlite.org/sqllogictest/doc/trunk/about.wiki) | A reference engine fills in expected query results; validation replays the completed scripts against an engine under test. Independently developed engines provide additional oracles. | The closest example of recording reference results and replaying them elsewhere. Later Java/Rust differential tests can supplement the fixed corpus. This checks query results, not performance or concurrency. |
| [SQLite — regression and fuzz testing](https://www.sqlite.org/testing.html) | Historical fuzz cases are retained and replayed by `fuzzcheck`; boundary, malformed-input and fault tests complement ordinary regression tests. | Keep minimized failures as permanent regression inputs, alongside deliberately selected boundary cases. A finite corpus complements rather than replaces other test methods. |
| [Apache Parquet — interoperability fixtures](https://github.com/apache/parquet-format#modules) / [parquet-testing](https://github.com/apache/parquet-testing) | Shared data files verify that implementations in different languages can read and write each other's files; the repository also keeps bad-data reproducers. | Reuse one fixture collection across languages. If serialization becomes a candidate later, test old-writer/new-reader and new-writer/old-reader paths explicitly. |
| [Apache Arrow — integration testing](https://arrow.apache.org/docs/format/Integration.html) | Human-readable JSON datasets and pre-generated IPC files support cross-language integration tests. | Separate portable test data from language-specific runners. The fixture format need not resemble the implementation's internal objects. |
| [Protocol Buffers — conformance suite](https://github.com/protocolbuffers/protobuf/blob/main/conformance/README.md) | A common tester communicates with small adapters for individual language implementations. | Keep a common contract and thin runners. This is a conformance example, not a universal byte-equality rule: [protobuf serialization is not canonical](https://protobuf.dev/programming-guides/serialization-not-canonical/). |
| [Go — go/doc golden files](https://go.dev/src/go/doc/testdata/) | Expected outputs are checked in as readable `.golden` files beside test inputs. | A lightweight precedent for reviewable expected-output files; this is an output-regression example, not a storage-format guarantee. |
| [Rust Insta — snapshot files](https://insta.rs/docs/snapshot-files/) / [review workflow](https://insta.rs/docs/cli/) | Committed snapshots are compared with new results, with an explicit review/accept workflow. Text snapshot line endings are normalized to LF. | Changes to expected results deserve review. The LF policy also illustrates why fixture transport details should not cause platform-dependent failures. |
| [Project Wycheproof](https://github.com/C2SP/wycheproof) | Implementation-agnostic JSON vectors and schemas encode expected behavior for cryptographic edge cases and known bugs. Language-specific tests consume the same vectors. | Label the intent of unusual cases and keep the oracle reusable. The cryptographic requirements themselves are separate from HugeGraph's codec contract. |
| [RFC 4648 — encoding test vectors](https://www.rfc-editor.org/rfc/rfc4648.html#section-10) | A small set of explicit input/output examples anchors encoding behavior. | Keep a few easy-to-explain examples beside the larger corpus. HugeGraph's ordered alphabet and sortable prefixes are its own format; RFC 4648 is a testing precedent, not the format to substitute. |
The comparison rule must follow the contract: exact encoded strings for HugeGraph's canonical sortable keys; semantic equivalence where a format permits multiple representations; and explicit compatibility decisions for historical malformed-input behavior.
### Java/Rust integration and operational boundaries
| Reference | Existing practice | What is useful for a later PoC |
|---|---|---|
| [Apache DataFusion Comet — architecture](https://datafusion.apache.org/comet/) / [compatibility](https://datafusion.apache.org/comet/user-guide/latest/compatibility/index.html) | Spark/JVM integration delegates supported work to a Rust native engine, with documented compatibility and fallback behavior. | Evaluate a bounded component while preserving observable behavior. A native engine's success does not establish a speedup for individual `LongEncoding` calls. |
| [Apache OpenDAL — Java binding](https://opendal.apache.org/docs/bindings/java/) | A Java API uses a Rust core and distributes platform-specific native artifacts. | A concrete reference for classifiers, native loading, platform support and release packaging. HugeGraph's preferred Java fallback still needs its own design. |
| [jni-rs](https://docs.rs/jni/latest/jni/) | Rust bindings expose Java native methods with explicit reference lifetimes and error/panic handling at the boundary. | Define ownership and Java-visible error mapping before integration; failures must not unwind across the FFI boundary. |
| [JNI design/performance guidance](https://developer.android.com/ndk/guides/jni-tips#general_tips) | The official Android JNI guide recommends reducing marshalling volume and frequency. | Benchmark the complete call path, including crossing, conversion/copying and returned objects. Compare single-item and batched calls where appropriate; Android guidance is not a HugeGraph benchmark. |
| [Rust wrapping arithmetic](https://doc.rust-lang.org/std/primitive.i64.html#method.wrapping_add) / [Rust string invariants](https://doc.rust-lang.org/std/primitive.str.html) | Wrapping operations are explicit, while Rust `str` requires valid UTF-8. | Preserve the documented overflow behavior and decide how arbitrary Java UTF-16 inputs, including lone surrogates, reach the Rust boundary. Ordinary string conversion must not silently change the test input. |
### Applying these references without expanding the current scope
- Keep the committed corpus and the existing hand-written, ordering and round-trip tests. Record the baseline revision and fixture-format version; inspect behavior changes before regenerating expected results.
- A future native candidate should demonstrate compatibility and end-to-end value against the Java baseline on representative workloads. Java fallback should cover defined availability/compatibility cases; it is not recovery from a fatal native-process failure.
- One coverage clarification for the earlier inventory: #3146 currently covers `encodeSortable`/`decodeSortable`, `encodeB64`/`decodeB64`, and `encodeSignedB64`/`decodeSignedB64`. It does **not** include `encodeNumber` or a shared `NumericUtil` corpus. Their existing Java unit tests and a future portable corpus are distinct forms of coverage.
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "dpol1 (via GitHub)" <gi...@apache.org>.
dpol1 commented on issue #3145:
URL: https://github.com/apache/hugegraph/issues/3145#issuecomment-5814268645
The RFC is ready for review in #3238. The evidence and the steps to reproduce the runs are in https://github.com/dpol1/hugegraph-rust-rfc. The checkbox "matrix reviewed in this thread" stays open until the maintainers review the matrix.
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed issue #3145: [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork
URL: https://github.com/apache/hugegraph/issues/3145
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "dosubot[bot] (via GitHub)" <gi...@apache.org>.
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URL: https://github.com/apache/hugegraph/issues/3145#issuecomment-5231671665
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<!-- Answer -->
Nice inventory. Here's a first pass on your four open points, traced through the current tree:
**1. Core `BytesBuffer` vs struct `BytesBuffer` — do they need to read each other's bytes?**
No, not at the gRPC boundary. The server's `BinarySerializer` encodes mutations using the core `BytesBuffer` into `BackendColumn.name`/`BackendColumn.value` byte arrays [[1]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-rocksdb/src/main/java/org/apache/hugegraph/backend/store/rocksdb/RocksDBTable.java#L105-L110). `HstoreTable.insert()` passes those byte arrays unchanged to the session/store [[2]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-hstore/src/main/java/org/apache/hugegraph/backend/store/hstore/HstoreTable.java#L239-L255). The gRPC payload itself is an opaque `bytes data` field on `StoreCommandRequest` — no field-level protobuf structure for IDs or properties [[3]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/resources/proto/raft.proto#L25-L53).
The struct `BytesBuffer` is used on the store side for **its own** key/query construction (prefix building, ID reading on the query path), not for re-encoding mutation payloads that crossed the wire [[4]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-common/src/main/java/org/apache/hugegraph/store/query/util/KeyUtil.java#L62-L65) [[5]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-core/src/main/java/org/apache/hugegraph/store/business/SelectIterator.java#L24-L69). So the two copies live behind separate boundaries. The encoding logic for string IDs is compatible (same `0x80`/`0xc0` prefix-bit scheme, same effective 16384-byte limit enforced in `writeId`) [[6]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-struct/src/main/java/org/apache/hugegraph/serializer/BytesBuffer.java#L706-L717) [[7]](https://github.com/apache/
hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/serializer/BytesBuffer.java#L684-L698), but they don't cross-decode each other's output at the gRPC layer.
That said, the store **does** read bytes that the server encoded — so format compatibility matters for the string-ID encoding path even though the two `BytesBuffer` classes don't call each other. A characterization fixture per copy (as you proposed) is the right deliverable; a cross-copy equality test would only be meaningful for the shared string-ID encoding subset.
**2. Store ingest path — does struct `BytesBuffer` encode on write, or only on read/query?**
Encoding happens on the server side. The core `BinarySerializer` produces fully encoded `BackendEntry` columns , `HstoreStore.mutate()` forwards `BackendAction` objects without re-serializing [[8]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-hstore/src/main/java/org/apache/hugegraph/backend/store/hstore/HstoreStore.java#L249-L315), and the session passes byte arrays straight to `graph.put()` [[9]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-hstore/src/main/java/org/apache/hugegraph/backend/store/hstore/HstoreSessionsImpl.java#L517-L526). The struct `BytesBuffer` is used in the store for read-side and query-side key construction [[10]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-hstore/src/main/java/org/apache/hugegraph/backend/store/hstore/HstoreStore.java#L448-L455), not for encoding inge
st payloads.
**3. External tools — do loader/hubble/tools parse or generate the binary row format?**
No. All three go through the client/REST API layer:
- The loader reads source records, converts to graph elements, and inserts via `context.client().graph()` [[11]](https://github.com/apache/hugegraph-toolchain/blob/bc49e6683fcc8f00e32d290cd558a0320c1850a3/hugegraph-loader/src/main/java/org/apache/hugegraph/loader/builder/ElementBuilder.java#L62-L95) [[12]](https://github.com/apache/hugegraph-toolchain/blob/bc49e6683fcc8f00e32d290cd558a0320c1850a3/hugegraph-loader/src/main/java/org/apache/hugegraph/loader/spark/HugeGraphSparkLoader.java#L152-L230).
- Hubble communicates through HTTP/REST [[13]](https://github.com/apache/hugegraph-toolchain/blob/bc49e6683fcc8f00e32d290cd558a0320c1850a3/hugegraph-hubble/hubble-be/src/main/java/org/apache/hugegraph/common/Response.java#L19-L36).
- Tools constructs a `HugeClient` from URL + graph name [[14]](https://github.com/apache/hugegraph-toolchain/blob/bc49e6683fcc8f00e32d290cd558a0320c1850a3/hugegraph-tools/src/main/java/org/apache/hugegraph/base/ToolClient.java#L20-L105).
None import or use HugeGraph's `BytesBuffer`. The binary row format is internal to the server ↔ store boundary.
**4. Kryo property values and page tokens across upgrades**
*Kryo*: There's no explicit cross-version compatibility mechanism. The Kryo instance is a bare `new Kryo()` plus a UUID serializer, pinned transitively through TinkerPop 3.5.1 [[15]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/util/KryoUtil.java#L25-L43) [[16]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/pom.xml#L38-L47). Generic properties use `writeClassAndObject()`/`readClassAndObject()` with no application-level version header [[17]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/util/KryoUtil.java#L64-L79), and the read path has no fallback for incompatible data [[18]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/bac
kend/serializer/BytesBuffer.java#L652-L655). A Kryo or TinkerPop upgrade should not be assumed safe for stored generic property values without testing representative persisted data.
*Page tokens*: These are ephemeral, client-carried cursors — Base64-encoded `PageState` containing a byte-array position, offset, and total count [[19]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/page/PageInfo.java#L61-L98) [[20]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/page/PageState.java#L26-L42). They survive normal restarts but there's no explicit cross-version compatibility guarantee [[21]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/page/PageInfo.java#L75-L98). Clients should be prepared to restart pagination from the first page after an upgrade.
**Summary for the matrix**: The two `BytesBuffer` copies live behind separate boundaries (server encodes, store reads), external tools don't touch the binary format, Kryo compatibility is unguaranteed, and page tokens are ephemeral. These findings reinforce that a per-copy characterization fixture is the right shape for `BytesBuffer`, and that `LongEncoding` → `NumericUtil` remains the natural fixture ordering since those are the codec paths with the cleanest boundaries.
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "dpol1 (via GitHub)" <gi...@apache.org>.
dpol1 commented on issue #3145:
URL: https://github.com/apache/hugegraph/issues/3145#issuecomment-5231627813
Compatibility inventory, first pass. Analyzed at master `c10779dc6` (the base of PR #3146). Counting rule: production sources only — test code, generated sources, and the bundled dist copy are excluded. File:line evidence exists for every cell, happy to expand any row.
| Candidate (module) | Wired production surface | Persisted or wire boundary | Existing oracle | Java fallback / PoC risk |
|---|---|---|---|---|
| `LongEncoding` (commons) | `encodeNumber`, `encodeSignedB64`, `decodeSignedB64`, `validB64Char` in 7 files; `decodeSortable`/`decodeNumber` have no production callers today | encoded strings embedded in vertex ids (primary-key strategy), edge sort keys, index ids and values, stored-string ids; the same contract reaches the store side via the struct copies of `IdGenerator`/`ConditionQuery`/`PropertyKey` | `LongEncodingTest`, golden corpus (PR #3146) | fallback cheap: final class, static pure functions, no state |
| `NumericUtil` (commons) | sortable conversions and byte helpers in 20 files | range-index row keys, `LongId` bytes, HBase counter cells; algorithm derived from Lucene `NumericUtils`, effectively frozen | `NumericUtilTest`; the corpus pins it only transitively via `encodeNumber` | fallback cheap: static, stateless; the byte-array surface has no golden corpus yet |
| `BytesBuffer` (server/core) | serializer stack, 26 files | the binary row format itself for every backend, raft log entries, client-visible page tokens; non-primitive property values embed Kryo bytes | `BytesBufferTest`, `BinarySerializer` round-trip tests | high: byte layout is the on-disk format, process-wide config state, Kryo coupling |
| `BytesBuffer` (hugegraph-struct, consumed by hstore modules) | store read/query paths, 16 files | gRPC `ByteString` id fields (wire) and RocksDB keys and values on the store side (disk) | none — no test imports this copy | high, and currently uncharacterized |
| `IntSet`/`IntMap` (server/core) | traversal records only, 4 files | none: per-request, in-heap | `IntMapTest`, `IntSetTest`, JMH benchmark | state cheap, but the concurrency contract is real (`concurrent=true` in K-neighbor/K-out) and the implementation sits on `sun.misc.Unsafe`, which is on the JEP 471 removal path |
Findings that actually move the selection:
1. `LongEncoding`'s wired surface is narrower than its API: production never calls `decodeSortable`/`decodeNumber`. The corpus still locks them (they are public contract), but a PoC can be judged on the four wired operations.
2. `NumericUtil`'s byte-array surface (`numberToSortableBytes` and friends, used in range-index keys) is the natural next corpus once the shape of #3146 settles.
3. Facts about the two `BytesBuffer` copies, recorded separately: the struct copy declares `ID_LEN_MAX = 32768` but its `writeId` enforces a literal 16384 and the declared constant is referenced only in a comment; the core copy declares `ID_LEN_MAX = 16384`; `BLOB_LEN` is 5 in core and 4 in struct; git history shows the struct file was extracted from the core one in 2025-09 while the core copy kept evolving (latest 2026-06, #3049); no test currently locks the struct copy. Whether the two copies must interoperate on the same byte format is one of the open points below. Until that contract is stated, the safe deliverable is a characterization fixture per copy, not a cross-copy equality test.
4. `IntSet`/`IntMap`: only 4 production call sites and transient state, so porting value looks low; the direct `sun.misc.Unsafe` usage matters for JDK upgrades independently of any Rust work. Side note: `IntMapByDynamicHash` has tests and a JMH benchmark but no production wiring.
Open points I could not settle from the tree — input welcome, and @dosu feel free to take a first pass:
- whether hugegraph-server's core `BytesBuffer` and the hstore struct copy ever need to read each other's bytes, or the two formats live behind separate boundaries;
- whether the store ingest path writes struct-`BytesBuffer`-encoded bytes, or only re-encodes on read and query;
- whether external tools (loader, hubble, tools) parse or generate the binary row format;
- whether stored Kryo-encoded property values are guaranteed readable across a Kryo upgrade, and whether page tokens are expected to survive a server upgrade.
I'll fold the answers into the matrix as they come.
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "dpol1 (via GitHub)" <gi...@apache.org>.
dpol1 commented on issue #3145:
URL: https://github.com/apache/hugegraph/issues/3145#issuecomment-5231624007
Contract notes for the LongEncoding corpus (PR #3146), the invariants worth knowing before porting or refactoring:
**Alphabet and ordering.** `B64_SYMBOLS` = `0-9 A-Z _ a-z ~`, 64 chars in ascending ASCII order. For canonical `encodeSortable` outputs, plain string comparison gives numeric order: negatives (prefix `0`) sort before positives because positive outputs always start with a length char >= `1`, the length character orders different magnitudes within one sign, and the digits decide between encodings of equal length.
**Length symbols.** `LENGTH_SYMBOLS` (`0-9A-F`) is exactly the first 16 characters of `B64_SYMBOLS`, and `decodeSortable` reads the declared length through `B64_SYMBOLS.indexOf`, so the prefix relationship is load-bearing for decoding: declared lengths from 0 to 63 are structurally accepted. Declared length 0 is reachable only in the negative form `"00"`, since the initial `str.length() >= 2` check rules out a bare positive length char.
**Wrapping is intentional.** `encodeSortable` maps negatives by `num += Long.MIN_VALUE` (overflow on purpose) and `decodeSortable` reverses it with `value -= Long.MIN_VALUE`; the digit loop accumulates with multiply/add that wrap silently. A port must use wrapping arithmetic (e.g. `wrapping_add`/`wrapping_sub`/`wrapping_mul` in Rust), not checked arithmetic.
**Decode accepts more than encode produces.** Structurally valid input goes up to 64 chars in the positive form and 65 with the negative prefix, and the accumulation wraps rather than failing. Concrete case: `decodeSortable("00")` returns `Long.MIN_VALUE`, while `encodeSortable(Long.MIN_VALUE)` produces `"010"`. Round-trip equality holds encode->decode, not decode->encode.
**Empty-string edge.** `decodeB64("")` = 0, `decodeSignedB64("")` = 0, `decodeSignedB64("-")` = 0. No exception.
**Specials.** `encodeSignedB64(Long.MIN_VALUE)` returns the literal `"-80000000000"` (the b64 of 2^63). `encodeB64` rejects any negative input with `IllegalArgumentException`.
**Error taxonomy.** `IllegalArgumentException` for argument/structural precondition failures (input shorter than 2 chars, declared length not matching the actual length, negative input to `encodeB64`); `NumberFormatException` for any character outside the symbol table during digit decoding, including non-ASCII BMP characters and surrogate code units; `NullPointerException` on null. Exception classes are contract; messages deliberately are not.
**Domains.** Encode outputs are always pure ASCII. Decode input is arbitrary UTF-16; the corpus exercises representative inputs on that side (non-ASCII BMP chars, surrogate pairs, lone surrogates), not an exhaustive sweep.
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Re: [I] [Proposal] Java compatibility fixtures and PoC selection matrix for the Rust modernization groundwork [hugegraph]
Posted by "SebastianGruza (via GitHub)" <gi...@apache.org>.
SebastianGruza commented on issue #3145:
URL: https://github.com/apache/hugegraph/issues/3145#issuecomment-5751608869
One data point for the `BytesBuffer` row of the matrix, from #3090: the store-side struct copy reads only the header byte of an encoded property value, and every pushdown path that would need the full struct decoding is dead today (sort keys reset, `NoIndexException`, `queryAll` receives a plain `Query`, the shard scan drops the query bytes). So the "fallback would have to stay byte-identical" constraint currently binds on the server's own encoder and its readers, not across the gRPC boundary to the store. Details and the codec test are in that thread. Baselines and upgrade/rollback requirements for the storage side are tracked in the sibling child issue I opened under #3110 today.
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