{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:IQXDX72PEO4334QMHHLV2EC4SK","short_pith_number":"pith:IQXDX72P","canonical_record":{"source":{"id":"2410.14239","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.DC","submitted_at":"2024-10-18T07:43:29Z","cross_cats_sorted":[],"title_canon_sha256":"5f66ec592216c02979ae8173790d66fae6b63b1da0379b77d2952a5f092f2687","abstract_canon_sha256":"6492decaed426f54d7b44d880cc11b2f93c7da654088c1e50401ab72358c6995"},"schema_version":"1.0"},"canonical_sha256":"442e3bff4f23b9bdf20c39d75d105c92985a8e7469160678492f9c4e45b1f09c","source":{"kind":"arxiv","id":"2410.14239","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2410.14239","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"arxiv_version","alias_value":"2410.14239v1","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2410.14239","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"pith_short_12","alias_value":"IQXDX72PEO43","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"pith_short_16","alias_value":"IQXDX72PEO4334QM","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"pith_short_8","alias_value":"IQXDX72P","created_at":"2026-07-05T09:22:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:IQXDX72PEO4334QMHHLV2EC4SK","target":"record","payload":{"canonical_record":{"source":{"id":"2410.14239","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.DC","submitted_at":"2024-10-18T07:43:29Z","cross_cats_sorted":[],"title_canon_sha256":"5f66ec592216c02979ae8173790d66fae6b63b1da0379b77d2952a5f092f2687","abstract_canon_sha256":"6492decaed426f54d7b44d880cc11b2f93c7da654088c1e50401ab72358c6995"},"schema_version":"1.0"},"canonical_sha256":"442e3bff4f23b9bdf20c39d75d105c92985a8e7469160678492f9c4e45b1f09c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:22:29.591243Z","signature_b64":"bnlgfzlByNIFLvYkrIFNMmn/dnOzucRlsUUxQV/cD0X7QcSbHOOCbIFTEOCJ+Dj7+aQ09CDg9CcZUjI9p1QYCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"442e3bff4f23b9bdf20c39d75d105c92985a8e7469160678492f9c4e45b1f09c","last_reissued_at":"2026-07-05T09:22:29.590676Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:22:29.590676Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2410.14239","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T09:22:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sbYxoyj7v+FjsAMJDzxGmXwKMgV69gAsR1fTHCKZeX9Zx1GB5u0KOJeJFkptYRph9auMKBCPcuNB22ZXEdmMCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T13:00:03.719794Z"},"content_sha256":"88cda8f87b4fd57d0cbc5a54d76f73290b75832eb95b242c25929008fe9baaad","schema_version":"1.0","event_id":"sha256:88cda8f87b4fd57d0cbc5a54d76f73290b75832eb95b242c25929008fe9baaad"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:IQXDX72PEO4334QMHHLV2EC4SK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Parallel Writing of Nested Data in Columnar Formats","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.DC","authors_text":"Jakob Blomer, Jonas Hahnfeld, Thorsten Kollegger","submitted_at":"2024-10-18T07:43:29Z","abstract_excerpt":"High Energy Physics (HEP) experiments, for example at the Large Hadron Collider (LHC) at CERN, store data at exabyte scale in sets of files. They use a binary columnar data format by the ROOT framework, that also transparently compresses the data. In this format, cells are not necessarily atomic but they may contain nested collections of variable size. The fact that row and block sizes are not known upfront makes it challenging to implement efficient parallel writing. In particular, the data cannot be organized in a regular grid where it is possible to precompute indices and offsets for indepe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2410.14239","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2410.14239/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T09:22:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"801b+ZnN0nDgB26liPL/auRy5uD+cOcZymMHkkYx8eLxWI4I16w7xn6sTj40QowuQFj/9pC6Vg1cafqSyvHVAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T13:00:03.720287Z"},"content_sha256":"6e63a62b22229275574eb059959c41b4a6df4d24cee0eac0d48ee8e61fe4867e","schema_version":"1.0","event_id":"sha256:6e63a62b22229275574eb059959c41b4a6df4d24cee0eac0d48ee8e61fe4867e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IQXDX72PEO4334QMHHLV2EC4SK/bundle.json","state_url":"https://pith.science/pith/IQXDX72PEO4334QMHHLV2EC4SK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IQXDX72PEO4334QMHHLV2EC4SK/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-18T13:00:03Z","links":{"resolver":"https://pith.science/pith/IQXDX72PEO4334QMHHLV2EC4SK","bundle":"https://pith.science/pith/IQXDX72PEO4334QMHHLV2EC4SK/bundle.json","state":"https://pith.science/pith/IQXDX72PEO4334QMHHLV2EC4SK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IQXDX72PEO4334QMHHLV2EC4SK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:IQXDX72PEO4334QMHHLV2EC4SK","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"6492decaed426f54d7b44d880cc11b2f93c7da654088c1e50401ab72358c6995","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.DC","submitted_at":"2024-10-18T07:43:29Z","title_canon_sha256":"5f66ec592216c02979ae8173790d66fae6b63b1da0379b77d2952a5f092f2687"},"schema_version":"1.0","source":{"id":"2410.14239","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2410.14239","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"arxiv_version","alias_value":"2410.14239v1","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2410.14239","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"pith_short_12","alias_value":"IQXDX72PEO43","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"pith_short_16","alias_value":"IQXDX72PEO4334QM","created_at":"2026-07-05T09:22:29Z"},{"alias_kind":"pith_short_8","alias_value":"IQXDX72P","created_at":"2026-07-05T09:22:29Z"}],"graph_snapshots":[{"event_id":"sha256:6e63a62b22229275574eb059959c41b4a6df4d24cee0eac0d48ee8e61fe4867e","target":"graph","created_at":"2026-07-05T09:22:29Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2410.14239/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"High Energy Physics (HEP) experiments, for example at the Large Hadron Collider (LHC) at CERN, store data at exabyte scale in sets of files. They use a binary columnar data format by the ROOT framework, that also transparently compresses the data. In this format, cells are not necessarily atomic but they may contain nested collections of variable size. The fact that row and block sizes are not known upfront makes it challenging to implement efficient parallel writing. In particular, the data cannot be organized in a regular grid where it is possible to precompute indices and offsets for indepe","authors_text":"Jakob Blomer, Jonas Hahnfeld, Thorsten Kollegger","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.DC","submitted_at":"2024-10-18T07:43:29Z","title":"Parallel Writing of Nested Data in Columnar Formats"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2410.14239","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:88cda8f87b4fd57d0cbc5a54d76f73290b75832eb95b242c25929008fe9baaad","target":"record","created_at":"2026-07-05T09:22:29Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"6492decaed426f54d7b44d880cc11b2f93c7da654088c1e50401ab72358c6995","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.DC","submitted_at":"2024-10-18T07:43:29Z","title_canon_sha256":"5f66ec592216c02979ae8173790d66fae6b63b1da0379b77d2952a5f092f2687"},"schema_version":"1.0","source":{"id":"2410.14239","kind":"arxiv","version":1}},"canonical_sha256":"442e3bff4f23b9bdf20c39d75d105c92985a8e7469160678492f9c4e45b1f09c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"442e3bff4f23b9bdf20c39d75d105c92985a8e7469160678492f9c4e45b1f09c","first_computed_at":"2026-07-05T09:22:29.590676Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:22:29.590676Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bnlgfzlByNIFLvYkrIFNMmn/dnOzucRlsUUxQV/cD0X7QcSbHOOCbIFTEOCJ+Dj7+aQ09CDg9CcZUjI9p1QYCA==","signature_status":"signed_v1","signed_at":"2026-07-05T09:22:29.591243Z","signed_message":"canonical_sha256_bytes"},"source_id":"2410.14239","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:88cda8f87b4fd57d0cbc5a54d76f73290b75832eb95b242c25929008fe9baaad","sha256:6e63a62b22229275574eb059959c41b4a6df4d24cee0eac0d48ee8e61fe4867e"],"state_sha256":"de53588211bedbd1b166d5bd7c7f358c0a9a96605ffe4cac70a5e0477eb9d992"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WZ88NkQ6ILoJDDXcqPpRLxGrHDov7NySer3fmKrYMo7KyoQWIPTbgOkeIaxWcZ2gJRu6HnrWy1+/0tJRZINyCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T13:00:03.724329Z","bundle_sha256":"fb8e9f7e1dc95692736f213ef3cfb2c51c0d4a29dc52f73a49e9349f28294ef1"}}