Ankur Mhatre
958b401f0f
Adds spring-boot-startup-time/, the companion project for BLOG-618: a runnable Spring Boot 4.1.1 application on JDK 25 that installs BufferingApplicationStartup and FlightRecorderApplicationStartup behind a system property, and a /diag/startup endpoint that computes step self time -- the number /actuator/startup does not give you and the one that names the actual culprits. Captured under docs/output/: the step tree sorted both ways, the same startup as JFR events, a +5000-class experiment putting 0.11 ms per scanned class on the classpath scan tax, the silent truncation a 2048-step buffer performs, and JDK 25 AOT cache timings (6.93 s to 4.82 s). Post body and metadata live in post/. Moves the existing Actuator project into actuator-in-production/ so the repository holds one directory per article; the root README is now an index.
20 lines
641 B
Bash
Executable File
20 lines
641 B
Bash
Executable File
#!/usr/bin/env bash
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# The single most useful number in this repository: how long a naive Kafka health check blocks.
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set -uo pipefail
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cd "$(dirname "$0")/.."
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OUT=docs/output/09-kafka-timeout.txt
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MODE="${1:-tuned}"
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B=http://localhost:8080/actuator/health/kafka
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{
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echo "### Kafka health check against an unreachable broker -- ${MODE}"
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echo
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echo "\$ time curl -s $B"
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s=$(date +%s.%N)
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body=$(curl -s -u ops:ops-password --max-time 180 "$B")
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e=$(date +%s.%N)
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echo "$body" | python3 -m json.tool 2>/dev/null || echo "$body"
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echo
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printf 'wall clock: %.1f s\n' "$(echo "$e - $s" | bc)"
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} > "$OUT.$MODE" 2>&1
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echo "wrote $OUT.$MODE"
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