原始 JSON 报告 机器可读
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"body": "process-graph was naive and performed O(n) separate passes over the\nhistory, each using a standard clojure sequence reduction. This commit\nreplaces that function with an optimized concurrent fold using Bifurcan\nstructures directly.",
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"headline": "consistency-model: relocate ROLA",
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"body": "This should save us some time, since projection is more expensive now.",
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"body": "We burned a lot of time in projecting single large SSCs, as show up in\npoorly isolated databases like prefix. This commit changes three things:\n\n1. We move the SCC vertex projection into the async task where it\n belongs\n2. We project rels on large SCCs in parallel then merge them. This burns\n mo\n[…]\n is ~10% faster overall.\n3. We no longer warm filtered graphs--many of the filtered graphs are\n unnecessary now\n\nThis brings us from ~5000 ops/sec to ~15,000 ops/sec on the\nsim-prefix-perf benchmark",
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"headline": "Roughly triple throughput for large SCCs",
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"headline": "Don't write out cycle text files or incompatible orders when :directo…",
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"body": "We defined an (in retrospect bad) variant of sequential extension which\nincluded intermediate vertices; this caused false positives in cycle\nexistence checks for certain kinds of graphs. Obvious in hindsight\n<sigh>.",
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"headline": "Fix a bug in cycle-exists due to sequential extension",
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"body": "Strips out basic utility functions from elle.graph: many of these are\nnow in bifurcan-clj. Wipes out the old BFS mechanisms in elle.graph\nwhich are now handled by elle.bfs. There's still a simple BFS used by\ndusty corner of elle.core, but I think that can be nuked soon.",
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"headline": "Spring cleaning!",
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"body": "RelGraph allowed constant-time union and projection once we'd built the\ngraphs for individual rels, but we paid a huge cost in materializing the\nvertices and out sets when doing Tarjan. Our new architecture makes two\ncosts cheaper:\n\n1. Operations on rel sets are now so cheap as to be invisible, than\n[…]\nhs and rel graph altogether, and obtain\na modest ~(10%?) speedup. We're hitting 50-55Khz in the sloppy test now.\n\nWe can also drop the materialize phase, since the full graph is\nmaterialized directly.",
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"headline": "Remove NamedGraph and RelGraph",
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"body": "We used to represent (e.g.) a predicate rw edge using :rw; we\ndistinguished between G2-item and G2 on the basis of a :predicate? field\nin the explainer's linkages once a cycle was found. We now build graphs\nwith separate wr and wrp, rw and rwp edges, etc.\n\nWe introduce new anomaly types :G-single-it\n[…]\n wrp rw].\n\nWe extend BFSPath so that its wanted rels are a *set* of rels, any of\nwhich may match. This lets us express a cycle which must have 'at least\none rw or rwp, and also at least one realtime'.",
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"headline": "Merge branch 'main' of github.com:jepsen-io/elle",
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"body": "We used to represent relationships as keywords or sets of keywords,\ne.g. :ww, #{:rw, :wr}. We now have a custom bitset representation,\nBitRels, which captures both a single rel and a set of rels in a single\nbyte, and provides primitive static functions for performing union,\nintersection, testing, et\n[…]\nstructing\nyour own relationship graphs, you'll need to name them using BitRels/WW,\nBitRels/REALTIME, etc., instead of :ww, :realtime, etc. You'll find\nconvenient references in the elle.rels namespace.",
"is_bot": false,
"headline": "Convert ISet<Keyword> rels in op graphs to custom bitsets.",
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"body": "core/check: call write-cycles! correctly",
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"headline": "Merge pull request #24 from nurturenature/tests",
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"headline": "core/check: call write-cycles! correctly",
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"body": "We burned a lot of time searching RelGraphs via Tarjan because the graph\nlazily computed vertices and out sets. We now perform this phase in\nparallel for a ~10% overall speedup on the sloppy list-append benchmark.",
"is_bot": false,
"headline": "txn: materialize graph before Tarjan search",
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"headline": "Ignore some dev/test files",
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"body": "When the BFS search finds a loop with a tail, it attempts to trim off\nthe tail and see if it can still find a loop in that subgraph.",
"is_bot": false,
"headline": "bfs: trim loops with tails",
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"headline": "Fix up tests, optimize cycle search path",
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"oid": "7c47e96bbe267dbeb4b5568fb3b78e76f836b1a1",
"body": "These consistency levels correspond to strong/strong-session\nserializable, SI, etc. We already had G0-realtime and G1c-realtime\nanomalies, but now they actually mean something.\n\nThis also makes our anomaly search trimming process more efficient: if\nwe find no SCC in WW U RT, we can prove that it's unnecessary to check\nfor G0-realtime, and so on. Before we only trimmed G0 itself, not\nrealtime or process variants.",
"is_bot": false,
"headline": "consistency-model: add strong and strong-session PL-1/PL-2",
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"headline": "list-append/sorted-values: Speed boost",
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"body": "Had to patch some things in Bifurcan too, but we're now to the point\nwhere our RelGraphs actually use custom comparators throughout.",
"is_bot": false,
"headline": "RelGraph equality semantics are now preserved",
"author_name": "Aphyr",
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"oid": "0f516625587d94db6a6cb8b5a4c8c6a7840fdb57",
"body": "We were burning tons of time in the cycle evaluator. This is a\nhand-optimized BFS search which supercedes all three of our previous\nsearch tactics, and is (presently) a tad faster. 50,000 ops/sec on the\nlist-append sloppy-perf-test.",
"is_bot": false,
"headline": "Work in progress: add a new elle.bfs cycle search algo",
"author_name": "Aphyr",
"author_login": "aphyr",
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"body": "This adds a new, more precise, less informative, and more efficient\nphase to cycle detection in elle.txn. In addition to performing a series\nof BFS searches for specific exemplars of cycles, Elle now also computes\na series of graphs which must be acyclic under certain consistency\nmodels. For instanc\n[…]\napproximately 20%\nby adding this pass. We think it's still worth it. It catches several\nanomalies our test suite missed, and allows precise claims to be made in\nlinear, as opposed to exponential time.",
"is_bot": false,
"headline": "Add cycle-exists anomalies",
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"headline": "list-append-test: add perf test for a sloppy db full of cycles",
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"oid": "fdb7244bc66ffaf4557c01e44fbb5ea7ef1ac2a7",
"body": "Now that operation graphs directly support fast index-based hashing and\nequality, we can skip the graph renumbering process entirely.",
"is_bot": false,
"headline": "graph: remove graph renumbering.",
"author_name": "Aphyr",
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"oid": "47a0e58adda724021f3087a9612f2c8c3d6bb5ac",
"body": "Operations on op graphs are now significantly faster, thanks to custom\nequality semantics. This should hopefully let us get rid of graph\nrenumbering.",
"is_bot": false,
"headline": "Replace transaction graphs with index-based hash and equality",
"author_name": "Aphyr",
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"headline": "rw-register: tweak iteration slightly, hoping for better perf",
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{
"oid": "6b706c77ccc18decddd1f460aceb3bdd01c05a81",
"body": "We use the severity order and implication graph to avoid checking for\n(e.g.) G0-realtime if we've already found a G0.",
"is_bot": false,
"headline": "txn: cycle search now skips implied anomalies",
"author_name": "Aphyr",
"author_login": "aphyr",
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{
"oid": "c41bcf6ba366a8e85885bdf7aad72eb4cd36126c",
"body": "We now have a notion of sorting anomalies by implication and severity,\nwhich we'll use for guiding the search order in txn.",
"is_bot": false,
"headline": "consistency-model: move to DAGs, introduce severity ordering",
"author_name": "Aphyr",
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"body_truncated": false,
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{
"oid": "96dd4e54ba4dc9487905b54c44b6120f397355b7",
"body": "We used to specify cyclic anomalies in terms of first-rels/rest-rels,\nwrote out process and realtime variants of anomalies by hand, and\nchecked them by running a general-purpose cycle search, explaining the\nfound cycle, then filtering the explanation. This... worked, but it was\neasy to forget to upd\n[…]\nup.\n\nLater on it might be worth profiling this and rewriting the whole\npathstate system in Java. Transition functions, loop checks, and\npredicates could all be folded into PathState validity directly.",
"is_bot": false,
"headline": "txn: redesign core anomaly specifications and rewrite cycle search",
"author_name": "Aphyr",
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"body": null,
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"headline": "elle.txn: drop superfluous pmap for filtered graphs",
"author_name": "Aphyr",
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"oid": "8ac01a6e289d50c9e649f89432ad8e553673e4fb",
"body": "We used to compute filtered graphs from the entire graph, then take each\nSCC and look for cycles in the whole graphs using just that SCC's\ntransactions. This meant we spent time materializing filtered graphs\nthat would never actually be used. This pulls the graph selection step\nall the way up: we fi\n[…]\nect, so there is no duplicated work. This also gets\nrid of the extra SCC arities for the various cycle-search routines in\ngraph: the graph IS the SCC. I'm also hopeful this gives improved\nparallelism.",
"is_bot": false,
"headline": "Txn: refactor cycle-search SCC partitioning approach",
"author_name": "Aphyr",
"author_login": "aphyr",
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"headline": "Version 0.1.10-SNAPSHOT",
"author_name": "Aphyr",
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"headline": "Version 0.1.9",
"author_name": "Aphyr",
"author_login": "aphyr",
"committed_at": "2023-10-26T18:13:04Z",
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{
"oid": "d840fe3f9f6eed5489434d411b1ec3017109f2d4",
"body": "…riants\n\nWe've introduced a number of anomaly variants which incorporate process\nor realtime edges, but neglected to unify them into a full lattice. This\npatch adds several missing implications: G0-process, for instance, now\nimplies G1c-process.",
"is_bot": false,
"headline": "consistency-models: Add missing lattice edges for process/realtime va…",
"author_name": "Aphyr",
"author_login": "aphyr",
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{
"oid": "5f9618c3b8f58c3b0a892412841222b251482f99",
"body": "A future read occurs when a transaction reads a value it will write in\nthe future. This is an internal anomaly in the sense that it manifests\nin a single transaction, but under Cerone et al it's it's actually a\nviolation of EXT, not INT. In Adya terms it's a singleton cycle of G1c:\nT1 -wr-> T1.",
"is_bot": false,
"headline": "list-append: add future-read anomaly type",
"author_name": "Aphyr",
"author_login": "aphyr",
"committed_at": "2023-10-26T17:52:29Z",
"body_truncated": false,
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},
{
"oid": "bd0f26c01c5da2909cbfab8fc148cf5c1f07ecb6",
"body": "Our definitions of strong session SI and strong SI were limited\nspecifically to G-nonadjacent-(process|realtime), respectively. We now\nconsider internal and G1-(process|realtime) anomalies as well.",
"is_bot": false,
"headline": "Expand strong-session-SI and strong-SI anomalies",
"author_name": "Aphyr",
"author_login": "aphyr",
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