DongHyeonkaandClaude Opus 5
b2963105a8
The keycloak project ended with four open questions that design could not
settle. A two-VM lab was built to answer them by measurement, and this is
that material: 26 experiments, 125 raw command outputs, 22 browser captures.
Follows the import procedure in README.md.
source/ the originating repository verbatim — 78 documents, 28 SVGs,
8 manifests, plus .source-revision recording the commit
final/ the SSOT
document.md 729 lines written from the 29 experiment documents, not
concatenated: what was predicted, what was measured, and
where the measurement itself was wrong
evidence/raw 125 outputs, flattened to <experiment>__<file> because
the originals collided (01-baseline.txt appeared three
times) and the audit only globs the top level
evidence/meta one per raw file; command and exitCode are null and the
README says why rather than inventing them
evidence/browser 22 captures
assets/ three diagrams through techviz
.techviz/ their VizSpecs
A separate project rather than an addition to keycloak: the B-layer answers
that project's four questions, but the A, C and D layers are about cluster
failure, SSO and operations, and one document.md should hold one subject.
The four question records there can point here through 관계.
Recorded rather than papered over: only three of the 28 diagrams were
remade. The repository forbids hand-drawn SVG and forbids titles inside the
canvas; all 28 originals carry both, so converting them is redrawing, not
reformatting. They stay in source/ and the gap is written into the document.
verify-pipeline.py passes. audit-records.py reports no issues.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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143 lines
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<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="2416" viewBox="0 0 1200 2416" role="img">
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<title>terminal evidence</title>
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<desc>Terminal-style rendering generated from retained command output. Sensitive-looking values are redacted in the visual asset.</desc>
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<rect x="1" y="1" width="1198" height="2414" rx="14" fill="#0d1117" stroke="#30363d"/>
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<rect x="1" y="1" width="1198" height="44" rx="14" fill="#161b22"/>
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<rect x="1" y="30" width="1198" height="14" fill="#161b22"/>
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<circle cx="24" cy="22" r="6" fill="#ff5f57"/>
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<circle cx="44" cy="22" r="6" fill="#febc2e"/>
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<circle cx="64" cy="22" r="6" fill="#28c840"/>
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<text x="92" y="27" fill="#8b949e" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace">terminal evidence</text>
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<text x="24" y="68" fill="#c9d1d9" font-size="15" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">$ S=src/adapter/outbound/persistence-mongo/src/main/java/dev/caskeleton/adapter/outbound/mongo
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A=$S/autoconfigure/MongoP</tspan><tspan x="24" dy="22">latformAutoConfiguration.java
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echo '# 검증기의 인접한 두 분기'
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sed -n '97,111p' $S/autoconfigure/MongoStartupValidator.</tspan><tspan x="24" dy="22">java
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echo
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echo '# 두 분기의 좌항이 오는 곳'
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sed -n '361,364p' "$A"
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echo
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echo '# 그 검사가 열리는 조건'
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sed -n '327</tspan><tspan x="24" dy="22">,332p' "$A"
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echo ' ...'
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sed -n '346,352p' "$A"
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echo
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echo '# changeStreams 는 컴팩트 생성자에서 고정된다'
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sed -n '48,55</tspan><tspan x="24" dy="22">p' $S/autoconfigure/MongoPlatformSettings.java
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echo -n '# 자동 구성 파일에서 changeStreams 가 나오는 줄 : '
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grep -c 'c</tspan><tspan x="24" dy="22">hangeStreams' "$A"
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echo
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echo '# 소비자 빈에 붙은 조건'
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sed -n '225,234p' "$A"
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echo
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echo '# 스트림을 여는 시점의 실패를</tspan><tspan x="24" dy="22"> 복구 정책이 분류하는 방식'
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sed -n '20,21p' $S/changestream/recovery/MongoChangeStreamRecoveryPolicy.java
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sed -n '53,61p</tspan><tspan x="24" dy="22">' $S/changestream/recovery/MongoChangeStreamRecoveryPolicy.java
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sed -n '64,65p' $S/changestream/recovery/MongoChangeStre</tspan><tspan x="24" dy="22">amRecoveryPolicy.java
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echo
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echo '# 그 런북의 증상 절 전체'
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sed -n '/^## Symptoms/,/^## /p' docs/mongodb/runbooks/fail</tspan><tspan x="24" dy="22">over.md | head -12
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echo -n '# 그 런북 전체에서 standalone·oplog·40573 이 나오는 줄 : '
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grep -ci 'standalone\|oplog\|</tspan><tspan x="24" dy="22">40573' docs/mongodb/runbooks/failover.md</tspan></text>
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<text x="24" y="310" fill="#8b949e" font-size="13" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">cwd: /shared/codebase/clean-architecture-backend-template</tspan></text>
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<text x="24" y="332" fill="#8b949e" font-size="13" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">time: 2026-09-02T08:20:08+00:00 · exit 1</tspan></text>
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<line x1="24" y1="346" x2="1176" y2="346" stroke="#30363d"/>
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<text x="24" y="386" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 검증기의 인접한 두 분기</tspan></text>
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<text x="24" y="408" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> if (transactionsEnabled && !capabilities.isStable(MongoCapability.TRANSACTION)) {</tspan></text>
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<text x="24" y="430" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> throw MongoOperationRejectedException.of(</tspan></text>
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<text x="24" y="452" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> "startup.capability",</tspan></text>
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<text x="24" y="474" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> "transactions are enabled but unavailable here: "</tspan></text>
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<text x="24" y="496" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> + capabilities.require(MongoCapability.TRANSACTION).constraints()</tspan></text>
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<text x="24" y="518" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> + "; a REPLICA_SET, SHARDED or ATLAS topology is required");</tspan></text>
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<text x="24" y="540" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> }</tspan></text>
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<text x="24" y="562" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> if (changeStreamsEnabled && !capabilities.isStable(MongoCapability.CHANGE_STREAM)) {</tspan></text>
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<text x="24" y="584" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> throw MongoOperationRejectedException.of(</tspan></text>
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<text x="24" y="606" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> "startup.capability",</tspan></text>
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<text x="24" y="628" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> "change streams are enabled but unavailable here: "</tspan></text>
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<text x="24" y="650" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> + capabilities.require(MongoCapability.CHANGE_STREAM).constraints()</tspan></text>
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<text x="24" y="672" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> + "; a REPLICA_SET, SHARDED or ATLAS topology is required");</tspan></text>
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<text x="24" y="694" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> }</tspan></text>
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<text x="24" y="716" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> }</tspan></text>
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<text x="24" y="738" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="760" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 두 분기의 좌항이 오는 곳</tspan></text>
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<text x="24" y="782" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // configured — and then validated the topology against that invented answer.</tspan></text>
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<text x="24" y="804" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> properties.transactions(),</tspan></text>
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<text x="24" y="826" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> properties.changeStreams(),</tspan></text>
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<text x="24" y="848" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> versions)</tspan></text>
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<text x="24" y="870" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="892" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 그 검사가 열리는 조건</tspan></text>
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<text x="24" y="914" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * <p>Conditional on a {@link MongoTopologyProbe} bean, because the check is about the server this</tspan></text>
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<text x="24" y="936" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> * deployment actually talks to, and only a composition root knows how to reach it.</tspan></text>
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<text x="24" y="958" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> */</tspan></text>
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<text x="24" y="980" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> @Bean</tspan></text>
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<text x="24" y="1002" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> @ConditionalOnBean(MongoTopologyProbe.class)</tspan></text>
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<text x="24" y="1024" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> public InitializingBean mongoPlatformStartupCheck(</tspan></text>
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<text x="24" y="1046" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> ...</tspan></text>
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<text x="24" y="1068" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> if (security == null || admin == null || versions == null) {</tspan></text>
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<text x="24" y="1090" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // Fail closed rather than validate a subset. A partial startup check reports success for</tspan></text>
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<text x="24" y="1112" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // the parts nobody supplied, which is the shape the missing wiring already had.</tspan></text>
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<text x="24" y="1134" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> throw new IllegalStateException(</tspan></text>
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<text x="24" y="1156" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> "the Mongo platform is enabled and a topology probe is present, but the security"</tspan></text>
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<text x="24" y="1178" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> + " profile, admin credential reference or schema version range is not configured;"</tspan></text>
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<text x="24" y="1200" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> + " the startup validator cannot answer with only part of its inputs");</tspan></text>
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<text x="24" y="1222" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="1244" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># changeStreams 는 컴팩트 생성자에서 고정된다</tspan></text>
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<text x="24" y="1266" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // Experimental, and therefore not a switch (MNG-INT-003). The driver-side source — watch,</tspan></text>
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<text x="24" y="1288" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // resumeAfter/startAfter, cursor lifetime, reconnection — is not shipped; what exists is policy</tspan></text>
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<text x="24" y="1310" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // and value objects that do not add up to a running consumer. Accepting the flag and ignoring</tspan></text>
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<text x="24" y="1332" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // it</tspan></text>
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<text x="24" y="1354" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // would leave an operator believing it took effect, so the value is refused rather than stored:</tspan></text>
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<text x="24" y="1376" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // zero beans, zero threads, and a `true` that cannot be honoured never becomes one that looks</tspan></text>
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<text x="24" y="1398" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> // honoured.</tspan></text>
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<text x="24" y="1420" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> changeStreams = false;</tspan></text>
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<text x="24" y="1442" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 자동 구성 파일에서 changeStreams 가 나오는 줄 : 1</tspan></text>
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<text x="24" y="1464" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="1486" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 소비자 빈에 붙은 조건</tspan></text>
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<text x="24" y="1508" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> @Bean</tspan></text>
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<text x="24" y="1530" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> @ConditionalOnMissingBean</tspan></text>
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<text x="24" y="1552" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> @org.springframework.boot.autoconfigure.condition.ConditionalOnBean({</tspan></text>
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<text x="24" y="1574" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> dev.caskeleton.adapter.outbound.mongo.changestream.MongoChangeStreamSubscription.class,</tspan></text>
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<text x="24" y="1596" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> dev.caskeleton.adapter.outbound.mongo.changestream.MongoResumeCheckpointStore.class,</tspan></text>
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<text x="24" y="1618" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> dev.caskeleton.adapter.outbound.mongo.changestream.MongoResumeTokenCodec.class,</tspan></text>
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<text x="24" y="1640" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> dev.caskeleton.adapter.outbound.mongo.changestream.projector.MongoChangeProjector.class,</tspan></text>
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<text x="24" y="1662" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> dev.caskeleton.adapter.outbound.mongo.changestream.projector.MongoChangeDeduplicationStore</tspan></text>
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<text x="24" y="1684" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> .class</tspan></text>
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<text x="24" y="1706" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> })</tspan></text>
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<text x="24" y="1728" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="1750" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 스트림을 여는 시점의 실패를 복구 정책이 분류하는 방식</tspan></text>
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<text x="24" y="1772" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> /** Runbook for a subscription that failed for a non-resumable reason. */</tspan></text>
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<text x="24" y="1794" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> public static final String FAILURE_RUNBOOK = "docs/mongodb/runbooks/failover.md";</tspan></text>
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<text x="24" y="1816" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> if (failure.hasServerCode() && isHistoryLost(failure.serverCode())) {</tspan></text>
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<text x="24" y="1838" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> return MongoChangeStreamRecoveryDecision.halt(</tspan></text>
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<text x="24" y="1860" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> MongoChangeStreamState.HISTORY_LOST, HISTORY_LOST_RUNBOOK);</tspan></text>
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<text x="24" y="1882" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> }</tspan></text>
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<text x="24" y="1904" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> if (failure.hasLabel("ResumableChangeStreamError")) {</tspan></text>
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<text x="24" y="1926" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> return MongoChangeStreamRecoveryDecision.resume();</tspan></text>
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<text x="24" y="1948" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> }</tspan></text>
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<text x="24" y="1970" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> return MongoChangeStreamRecoveryDecision.halt(MongoChangeStreamState.FAILED, FAILURE_RUNBOOK);</tspan></text>
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<text x="24" y="1992" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> }</tspan></text>
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<text x="24" y="2014" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> private static boolean isHistoryLost(int serverCode) {</tspan></text>
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<text x="24" y="2036" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> return serverCode == 286 || serverCode == 280;</tspan></text>
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<text x="24" y="2058" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="2080" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 그 런북의 증상 절 전체</tspan></text>
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<text x="24" y="2102" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">## Symptoms</tspan></text>
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<text x="24" y="2124" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="2146" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">- `MongoServerSelectionException` / `MongoConnectionException` spike, then recovery within seconds.</tspan></text>
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<text x="24" y="2168" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">- `MongoSdamObservationListener` reports a topology change (primary removed, new primary elected).</tspan></text>
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<text x="24" y="2190" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">- `MongoPoolObservationListener` shows checkout wait times rising while server-side command duration</tspan></text>
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<text x="24" y="2212" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"> stays flat — the wait is topology, not query cost.</tspan></text>
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<text x="24" y="2234" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">- Latency spike on writes with no corresponding rise in read latency.</tspan></text>
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<text x="24" y="2256" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="2278" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">A failover that resolves in under ~15 s and produces no `WRITE_RESULT_UNKNOWN` is normal replica-set</tspan></text>
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<text x="24" y="2300" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">behaviour and needs no action beyond confirming it self-healed.</tspan></text>
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<text x="24" y="2322" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"></tspan></text>
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<text x="24" y="2344" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0">## Diagnosis</tspan></text>
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<text x="24" y="2366" fill="#e6edf3" font-size="14" font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" xml:space="preserve"><tspan x="24" dy="0"># 그 런북 전체에서 standalone·oplog·40573 이 나오는 줄 : 0</tspan></text>
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</svg>
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