kim kwang yong

@bananayong

Productivity. Solve problems. Code. Easy, not perfect

Seoul
Vrijeme pridruživanja: svibanj 2009.

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  1. proslijedio/la je Tweet
    prije 21 sat

    HA clusters. Documentation vs Reality.

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  2. proslijedio/la je Tweet
    2. velj
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  3. proslijedio/la je Tweet
    2. velj

    The slides for HTTP/3 for everyone are available here: (lots of fun links on the last slide!)

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  4. proslijedio/la je Tweet
    1. velj

    Some people, when confronted with a problem, think “I know, I'll use ThreadLocal.” Now they have two problems.

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  5. proslijedio/la je Tweet
    31. sij

    Principles to Handle Thousands of Connections in Java Using Netty via

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    📢 "E2E testing your 2.3.0 apps with " I just gave Spring Boot 2.3.0.M1 a try and I must say now I am in love with ! Can't wait for the release now 🤓

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  7. proslijedio/la je Tweet
    30. sij

    That was my idea. Please tell me whether you like it :-)

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  8. proslijedio/la je Tweet
    29. sij

    The JVM's mysterious AllocatePrefetch options: what do they actually do?

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  9. proslijedio/la je Tweet
    29. sij

    ScheduledThreadPoolExecutor is prone to clock drift problem and should not be used for periodic scheduling in terms of UTC, system time, or for user interactions. I've created CronScheduler as a replacement for these cases:

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  10. 29. sij

    Answer: Hibernate throws MultipleBagFetchException - cannot simultaneously fetch multiple bags

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  11. proslijedio/la je Tweet
    28. sij

    TIL: G1 adaptive InitiatingHeapOccupancyPercent (default since JDK 9) can be the reason of longer, more frequent GC pauses, and higher CPU usage.

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  12. 28. sij

    How to Instrument UserLand Apps with eBPF 님이 공유

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  13. proslijedio/la je Tweet
    26. sij

    Some performance tricks when using the RoaringBitmap library

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  14. proslijedio/la je Tweet
    27. sij

    Interesting performance advice in the world of non-free GC write barriers: avoid unconditional overwrite of the field if it expected to have the same value in >99% of cases. Adding a branch may noticeably improve the performance.

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  15. proslijedio/la je Tweet
    26. sij

    1) Are you using via for mac? Have you ever noticed `EXPLAIN ANALYZE` slowing down your queries by like 60x? Let's dig into some and internals to figure out what's going on!

    An accessible version of this thread is available at https://github.com/felixge/tweets/tree/master/postgres-docker-explain-analyze
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  16. proslijedio/la je Tweet
    26. sij

    Working on a new blog post about custom Flight Recorder events and feeding them to Prometheus/Grafana using the new JFR Event Streaming API (). Having both, live monitoring/alerting and recording files for offline analysis, is a really powerful combo.

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  17. proslijedio/la je Tweet
    26. sij
    Odgovor korisnicima i sljedećem broju korisnika:

    I agree with Bruno; generally avoid returning null if possible. Requiring all callers to check for null every time is a source of NPEs. In addition to Bruno’s suggestions, consider a “null object” that is empty or zero or equivalent, eg. for String, return “” instead of null.

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  18. proslijedio/la je Tweet
    24. sij
    Odgovor korisnicima

    BTW, async-profiler can trace humongous allocations nicely with just a single command:

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  19. proslijedio/la je Tweet
    23. sij
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  20. proslijedio/la je Tweet

    Regarding trailing slashes in Spring Cloud Gateway: I added static resources to `src/main/resources/static/abc`, match a Path predicate `/abc` and have a RewriteRule filter `/abc, /abc/index.html`. It works for `/abc/` in the browser but not for `/abc`. 🤪

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