feat(sdk): DSPX-4584 stream the TDF manifest, remove the ~21.7M segment ceiling - #399
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feat(sdk): DSPX-4584 stream the TDF manifest, remove the ~21.7M segment ceiling#399sujankota wants to merge 2 commits into
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… (DSPX-4584) The manifest was assembled entirely in memory on both paths, so a payload past ~21.7M segments (41 TiB at 2 MiB segments) hard-failed with OutOfMemoryError: Requested array size exceeds VM limit. - serialize the manifest straight into the zip entry and parse it from a Reader, so neither side materializes it as a Java String - add Manifest.Segments, a compact fixed-stride AbstractList<Segment> backed by packed hash bytes (~24 B/segment instead of ~176), with an ArrayList fallback for manifests this SDK did not write - materialize the aggregate hash once and share it with the root signature and every assertion instead of copying it per assertion Manifest JSON bytes are unchanged. The 0.manifest.json zip entry is now a streamed data-descriptor entry, the same form 0.payload already used. EOF
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe SDK adds compact manifest segment storage and streams manifest JSON through TDF readers and writers. TDF encryption, loading, hash aggregation, resource closing, compatibility APIs, and tests use the updated representations. ChangesManifest streaming and segment handling
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant TDF
participant Manifest
participant TDFWriter
participant ZipEntry
participant TDFReader
TDF->>Manifest: append and aggregate segment hashes
TDF->>TDFWriter: open manifest output stream
TDFWriter->>ZipEntry: write serialized manifest
TDF->>TDFReader: open manifest reader
TDFReader->>Manifest: readManifest(Reader)
Manifest-->>TDF: parsed manifest
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✅ Passed checks (4 passed)
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🧪 Generate unit tests (beta)
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Inline comments:
In `@sdk/src/main/java/io/opentdf/platform/sdk/Manifest.java`:
- Around line 185-186: Validate the first manifest hash’s stride against the
maximum safe chunk allocation before assigning it or entering the allocation
path in Manifest parsing. Reject oversized hashes before evaluating stride *
SEGMENTS_PER_CHUNK, while preserving normal chunk creation for valid strides and
the existing ArrayList fallback.
In `@sdk/src/main/java/io/opentdf/platform/sdk/TDFWriter.java`:
- Around line 30-31: Restore the public deprecated appendManifest(String) method
in TDFWriter as a compatibility wrapper, keeping its existing signature and
deprecation status. Implement it by delegating to manifest() while preserving
the current manifest-writing behavior and API compatibility.
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sdk/src/main/java/io/opentdf/platform/sdk/Manifest.javasdk/src/main/java/io/opentdf/platform/sdk/SDK.javasdk/src/main/java/io/opentdf/platform/sdk/TDF.javasdk/src/main/java/io/opentdf/platform/sdk/TDFReader.javasdk/src/main/java/io/opentdf/platform/sdk/TDFWriter.javasdk/src/test/java/io/opentdf/platform/sdk/SegmentsTest.javasdk/src/test/java/io/opentdf/platform/sdk/TDFWriterTest.java
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| try (Reader manifestJson = manifest()) { | ||
| return Manifest.decodePolicyObject(Manifest.readManifest(manifestJson)); |
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Suggested change
| try (Reader manifestJson = manifest()) { | |
| return Manifest.decodePolicyObject(Manifest.readManifest(manifestJson)); | |
| try (Reader manifestRaw = manifest()) { | |
| return Manifest.decodePolicyObject(Manifest.readManifest(manifestRaw)); |
| * Concatenates every segment hash, which is what the root signature and the | ||
| * assertion signatures are computed over. | ||
| */ | ||
| private static byte[] aggregateSegmentHashes(List<Manifest.Segment> segments, boolean isEncrypted) { |
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Instead of creating this in memory, you can just call update multiple times on the Mac object.
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The manifest was assembled entirely in memory on both paths, so a payload past ~21.7M segments (41 TiB at 2 MiB segments) hard-failed with OutOfMemoryError: Requested array size exceeds VM limit.
Manifest JSON bytes are unchanged. The 0.manifest.json zip entry is now a streamed data-descriptor entry, the same form 0.payload already used.
Summary by CodeRabbit
New Features
Breaking Changes
Compatibility