47 lines
5.2 KiB
XML
47 lines
5.2 KiB
XML
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<title id="title">Expand, migrate, switch and contract timeline</title>
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<desc id="desc">Four-stage timeline for a safe data migration. The old representation remains through expand, migrate and switch. Contract happens only after compatibility evidence and an explicit recovery boundary.</desc>
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<text x="82" y="90" fill="#ffffff" font-family="Arial, sans-serif" font-size="32" font-weight="700">Миграция: старая форма живёт до contract</text>
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<text x="82" y="128" fill="#cbd5e1" font-family="Arial, sans-serif" font-size="22">Expand → migrate → switch → contract: удалить старое можно только после отдельного evidence</text>
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<circle cx="190" cy="350" r="48" fill="#2f855a"/>
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<circle cx="455" cy="350" r="48" fill="#2f855a"/>
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<text x="165" y="360" fill="#ffffff" font-family="Arial, sans-serif" font-size="26" font-weight="700">1</text>
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<text x="430" y="360" fill="#ffffff" font-family="Arial, sans-serif" font-size="26" font-weight="700">2</text>
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<text x="695" y="360" fill="#ffffff" font-family="Arial, sans-serif" font-size="26" font-weight="700">3</text>
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<text x="960" y="360" fill="#ffffff" font-family="Arial, sans-serif" font-size="26" font-weight="700">4</text>
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<rect x="72" y="196" width="236" height="104" rx="18" fill="#e6fffa" stroke="#2f855a" stroke-width="3"/>
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<text x="96" y="236" fill="#1a202c" font-family="Arial, sans-serif" font-size="28" font-weight="700">Expand</text>
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<text x="96" y="270" fill="#334e68" font-family="Arial, sans-serif" font-size="21">Добавить new shape</text>
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<text x="96" y="294" fill="#334e68" font-family="Arial, sans-serif" font-size="21">не ломая old writer</text>
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<rect x="337" y="196" width="236" height="104" rx="18" fill="#e6fffa" stroke="#2f855a" stroke-width="3"/>
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<text x="361" y="236" fill="#1a202c" font-family="Arial, sans-serif" font-size="28" font-weight="700">Migrate</text>
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<text x="361" y="270" fill="#334e68" font-family="Arial, sans-serif" font-size="21">Bounded backfill</text>
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<text x="361" y="294" fill="#334e68" font-family="Arial, sans-serif" font-size="21">и stop condition</text>
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<rect x="602" y="196" width="236" height="104" rx="18" fill="#fffbeb" stroke="#d69e2e" stroke-width="3"/>
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<text x="626" y="236" fill="#1a202c" font-family="Arial, sans-serif" font-size="28" font-weight="700">Switch</text>
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<text x="626" y="270" fill="#334e68" font-family="Arial, sans-serif" font-size="21">Reader меняется</text>
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<text x="626" y="294" fill="#334e68" font-family="Arial, sans-serif" font-size="21">по evidence</text>
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<rect x="867" y="196" width="236" height="104" rx="18" fill="#fff5f7" stroke="#b83280" stroke-width="3"/>
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<text x="891" y="236" fill="#1a202c" font-family="Arial, sans-serif" font-size="28" font-weight="700">Contract</text>
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<text x="891" y="270" fill="#334e68" font-family="Arial, sans-serif" font-size="21">Удалить old path</text>
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<text x="891" y="294" fill="#334e68" font-family="Arial, sans-serif" font-size="21">только отдельно</text>
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<rect x="80" y="430" width="758" height="130" rx="18" fill="#ffffff" stroke="#829ab1" stroke-width="3"/>
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<text x="108" y="474" fill="#102a43" font-family="Arial, sans-serif" font-size="27" font-weight="700">Совместимый период</text>
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<text x="108" y="512" fill="#334e68" font-family="Arial, sans-serif" font-size="23">old reader/writer и new reader/writer имеют объявленную форму данных</text>
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<text x="108" y="542" fill="#334e68" font-family="Arial, sans-serif" font-size="23">старое представление сохраняется, пока есть declared old consumer</text>
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<text x="900" y="474" fill="#7a2846" font-family="Arial, sans-serif" font-size="25" font-weight="700">Не rollback</text>
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<text x="900" y="510" fill="#7a2846" font-family="Arial, sans-serif" font-size="20">Удалённые данные</text>
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<text x="900" y="536" fill="#7a2846" font-family="Arial, sans-serif" font-size="20">не вернёт binary</text>
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<text x="252" y="714" fill="#1f7a4d" font-family="Arial, sans-serif" font-size="24" font-weight="700">До contract можно вернуться к совместимому code path</text>
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<text x="92" y="774" fill="#486581" font-family="Arial, sans-serif" font-size="20">Это схема решений, не SQL-план и не обещание поведения конкретной СУБД.</text>
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