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      lex: "Icechunk\'s session commit-or-abandon model and snapshot isolation produce zero observable metadata\342\200\223data inconsistencies across F1 (crash after data, before metadata \342\200\224 abandoned session), F2 (metadata-ahead-of-data state, measured directly \342\200\224 not applicable as a fault *injection* since Icechunk co-commits both in one session, but now empirically checked rather than asserted), and F3 (concurrent reader during an in-progress write), on both backends tested: 0/1000 trials on the local filesystem, and 0/100 trials on a real S3-compatible object store (NIRD/Sigma2, `s3.nird.sigma2.no`). A naive disconnected STAC index (B0) produces inconsistencies in every trial across all scenarios on the local filesystem. STAC B1 (best-effort: write-ordering + reconciliation sweeper) eliminates the F2 scenario by construction and closes the F1 window after the sweeper runs (1000 \342\206\222 0), but cannot prevent the F3 concurrent-read window \342\200\224 any reader arriving between the zarr write and the STAC update observes an inconsistency, identical to B0.\n\nBeyond the session-model scenarios, a fourth scenario \342\200\224 F4, concurrent racing writers \342\200\224 tests the mechanism the claim attributes *specifically* to object stores: conditional writes (compare-and-swap on the branch tip), the property that lets a store reject a commit whose session is based on a stale tip. Two sessions branch from the same committed snapshot, write OVERLAPPING data to the same array region (forcing a genuine conflict \342\200\224 Icechunk can silently rebase non-overlapping edits, which would not test rejection), and both attempt to commit. F4 was run on both backends \342\200\224 local filesystem (1000 trials) and NIRD/Sigma2 (100 trials, with live `MINIO_*` credentials) \342\200\224 and on **both**, every single trial showed: the first commit succeeds and moves the branch tip; the second session, based on a now-stale tip, has its commit rejected with `icechunk.ConflictError` (the exact exception, confirmed against the installed icechunk==2.0.6 API/docstring); and the store\nends in a single coherent state regardless of which writer won.\n\n  F4 \342\200\224 conflict_rejected == True / inconsistent == False:\n    Local filesystem:        1000/1000 / 1000/1000\n    NIRD/Sigma2 object store:  100/100 /   100/100\n\nThis is the positive control for the conditional-write guarantee, green, on the actual target backend \342\200\224 measured with real network round-trips against a production S3-compatible object store, not asserted from code or inferred from a local unit test.\n\nTaken together, every sub-claim in the headline claim is now supported by measured evidence in its target environment: commit-or-abandon atomicity (F1), snapshot isolation (F3), the absence of a metadata-ahead-of-data state (F2, measured), and \342\200\224 the part that is *specific* to object stores and the reason this replication went to NIRD \342\200\224 conditional writes correctly enforcing atomicity under a genuine write race (F4). The claim is Validated."
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      lex: "Fault-injection harness, run on two backends. icechunk 2.0.6, zarr 3.2.1, Python 3.12. Results in data/results/results.parquet (10400 rows total). All fault scenarios are deterministic (fault always injected at the same point, or \342\200\224 for F4 \342\200\224 the same race is forced deliberately every trial); counts reflect worst-case presence of inconsistency, not empirical hit probability.\n\n  Backend 1 \342\200\224 local filesystem: 1000 trials per scenario per system for F1/F2/F3   (icechunk, stac_b0, stac_b1) and 1000 trials of F4 (icechunk only), seed=42.\n  Backend 2 \342\200\224 NIRD/Sigma2 S3-compatible object store (`s3.nird.sigma2.no`, a private   project bucket, prefix `icechunk-atomicity-test/<run_id>/`): 100 trials per\n  scenario for F1/F2/F3/F4, Icechunk only, seed=43. (The STAC baseline is not re-run on   the object store: its inconsistency is a structural property of the disconnected\n  two-step write, not of the storage layer \342\200\224 see `harness/run_matrix.py` for the   rationale. F4 is Icechunk-specific by construction \342\200\224 STAC has no commit/conflict model   to race against.)\n\n=== Local filesystem backend (1000 trials) ===\n\nF1 \342\200\224 crash after data write, before metadata update:\n  Icechunk:   0/1000 inconsistencies (0 percentage points)\n              [abandoned session; last committed snapshot unchanged]\n  STAC B0: 1000/1000 (100 percentage points)\n              [zarr updated, STAC JSON not \342\200\224 stale metadata persists]\n  STAC B1: 1000/1000 pre-sweep \342\206\222 0/1000 post-sweep\n              [write-ordering does not prevent F1; sweeper detects and corrects\n               the mismatch by recomputing sha256 from zarr and overwriting STAC]\n\nF2 \342\200\224 crash after metadata update, before data write:\n  Icechunk:   0/1000 (measured, not asserted: `icechunk_is_metadata_ahead_of_data`\n              checks the committed snapshot directly for a metadata-ahead-of-data\n              state after the only crash path Icechunk has \342\200\224 an abandoned session.\n              There is no metadata-before-data write order to inject a fault into,\n              since both are written in the same session and co-committed atomically;\n              this measurement makes that structural property falsifiable rather than\n              assumed \342\200\224 a future change that split the commit would flip it to True)\n  STAC B0: 1000/1000 (100 percentage points)\n              [STAC updated with new sha256, zarr still holds old data]\n  STAC B1:    0/1000 (by design \342\200\224 write-ordering enforces data-before-STAC, making\n              the F2 fault point unreachable in B1\'s code path; not empirically\n              measured \342\200\224 asserted by inspection of the implementation)\n\nF3 \342\200\224 concurrent reader during in-progress write:\n  Icechunk:   0/1000 (readonly_session reads last committed snapshot;\n              in-progress writer changes are invisible until commit)\n  STAC B0: 1000/1000 (100 percentage points)\n  STAC B1: 1000/1000 (100 percentage points)\n              [write-ordering does not close the F3 window; the sweeper was not\n               invoked during F3 trials because post-hoc reconciliation cannot\n               retroactively prevent a reader that already observed the window]\n\nNote: F3 counts represent worst-case exposure (simulated reader always arrives between the two writes). In a real workload, hit probability depends on window duration and reader polling frequency \342\200\224 not measured here.\n\n=== NIRD/Sigma2 S3-compatible object store (100 trials, Icechunk only) ===\n\nF1 \342\200\224 crash after data write, before metadata update:\n  Icechunk:   0/100 inconsistencies (0 percentage points)\n              [identical mechanism to local FS: abandoned session, last committed\n               snapshot unchanged \342\200\224 but here the \"commit\" is a conditional write\n               (compare-and-swap) against the object store, not a POSIX rename]\n\nF2 \342\200\224 crash after metadata update, before data write:\n  Icechunk:   0/100 (measured via `icechunk_is_metadata_ahead_of_data`, identical\n              method and reasoning to local FS \342\200\224 see above)\n\nF3 \342\200\224 concurrent reader during in-progress write:\n  Icechunk:   0/100 (readonly_session reads the last committed snapshot;\n              in-progress writer changes are invisible until the conditional-write\n              commit succeeds)\n\nThe F1/F2/F3 result is identical in kind and in count (zero) to the local-filesystem result. Note what these three scenarios actually exercise on this backend: the abandoned-session path (F1), the committed-snapshot state directly (F2), and a single-writer commit (F3). None of these issues a conditional write that contests an already-moved branch tip \342\200\224 that is what F4, below, tests, and it is the scenario that determines whether this backend\'s CAS implementation is what the claim needs it to be.\n\n=== F4 \342\200\224 concurrent racing writers (the conditional-write / CAS test) ===\n\nTwo sessions branch from the same committed snapshot, write OVERLAPPING data to the same array region (forcing a real conflict \342\200\224 Icechunk can silently rebase non-overlapping edits, which would not test rejection), and both attempt to commit. Expected (CAS enforced): the first commit succeeds and moves the branch tip; the second session is now based on a stale tip and `Session.commit()` must raise `icechunk.ConflictError` (the exact exception name, confirmed against the installed icechunk==2.0.6 API \342\200\224 the `commit()` docstring states: \"If the session is out of date, this will raise a ConflictError exception depicting the conflict that occurred\").\n\n  Local filesystem (1000 trials, seed=42):\n    inconsistent:         0/1000  (store always ends in a single coherent state)\n    conflict_rejected: 1000/1000  (icechunk.ConflictError raised on every stale commit)\n  \342\206\222 POSIX rename also enforces a form of compare-and-swap at the filesystem level, so\n    this result was expected; it confirms the F4 harness code itself works and measures\n    what it claims to measure (an assertion-style check would fail loudly if\n    `ConflictError` were not raised, or if the wrong exception name had been pinned \342\200\224\n    this was first verified with a 20-trial unit test before the full 1000-trial run).\n\n  NIRD/Sigma2 S3-compatible object store (100 trials, seed=43, run with live `MINIO_*`\n  credentials \342\200\224 the run that determines whether the conditional-write guarantee, the\n  actual subject of the claim on object stores, holds on NIRD):\n    inconsistent:       0/100  (store always ends in a single coherent state)\n    conflict_rejected: 100/100  (icechunk.ConflictError raised on every stale commit,\n                        over a real network round-trip against a production\n                        S3-compatible endpoint, not a local POSIX filesystem)\n\n  This is the positive control, green, on the real target backend: every stale-tip   commit was rejected, and the store was never observed in a mixed/blended state. Had   `conflict_rejected` been False on any NIRD trial \342\200\224 the object store accepting a commit   from a stale tip \342\200\224 that would itself have been the headline finding (a Contradicted or qualified result), not a footnote. It was not observed; the conditional-write guarantee   holds on NIRD/Sigma2, identically in kind to the local-filesystem result and confirmed independently over a real network against a production object store."
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      lex: "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"
    }
  }
}
rows {
  name {
    value: "hasSignature"
  }
}
rows {
  quad {
    p_iri {
    }
    o_literal {
      lex: "NBTDm4DkmhK6oGua4GfbDCYVcTfSmYmI/Iz+INqDGkHOjn2qDqPvMSBRQIio22EcUpAJ6NKw1nuKP5SDMQSBQEM0iwtG/z4SYyW7zdVseDkwzufWd2L6CCZbwc24P2rmkq3fCoXk3pVaDJPGS4MB/BrTafnYOUJB6y2YCN/B0QQgZB4TT6hdO6NTuIX4BbAMquToH3moPAExJNzJVwu2RNh5Y8io1JkZdqfJYBh5wIdIHa/dW9HBu5qTepJujCBU4KFWAVy77G/r3NWD3o4ud6yNcCdDb/EY/prFJeDHf+bdbJRfTco+i7nu0NJpLKohx7ELCPOgPydElo6ha0XyN+Go0J+YB5qebqXsYuy8p++MaB7MrOteXXgJgsggbRC/2KWmmVLg26oRwykLuoG/Uo7l7vTQyyk/Ep7uEodB/l/0w69pMx2LN71LmhwJLSKlSi0G6E6kMJ1lT+gefwI2DBNWIHTKVnYDbBgEIpzso+UVDYz6Ybl1h3qTmR4UF13wuJW4LIDRhWbnsJLd2XC4pgxrPlwcaaXRFjwiiHZNti5TdMu7Dj2DTR609+EL7P7W/xJk/BkMPalSMRPqCuJFAi1TOqZxYNbVYGTrX7r40EOxhxXO1mK2k09V0I2eXMyeCsQLWeubrK7gF1X0B88NwCH0c3c6/WvYd0MDX/r6khE="
    }
  }
}
rows {
  name {
    value: "hasSignatureTarget"
  }
}
rows {
  quad {
    p_iri {
    }
    o_iri {
      prefix_id: 1
      name_id: 1
    }
  }
}
rows {
  name {
    value: "signedBy"
  }
}
rows {
  quad {
    p_iri {
      prefix_id: 6
      name_id: 43
    }
    o_iri {
      prefix_id: 14
      name_id: 28
    }
  }
}