solr-undertow v1.8.0-RC Release Notes

Release Date: 2020-06-30 // 4 months ago
  • 🛠 Fix support for Solr 8.x builds that require metrics-*.jar files in server library path.

    ⚡️ update Kotlin to 1.3.72
    ⚡️ update Undertow to 1.4.28.Final
    ⚡️ update Solr testing to 8.5.2


Previous changes from v1.7.0

  • ➕ Added request per second rate limiting, see example rate limited config file for a full example. These are the new settings that go WITHIN the rate limiter definition:

    maxReqPerSecond: 80
    throttledReqPerSecondMinPauseMillis: 10
    throttledReqPerSecondMaxPauseMillis: 50
    overLimitReqPerSecondHttpErrorCode: 503 
    

    The throttledReqPerSecondMinPauseMillis is a small pause that happens each time a request cannot be made, causing a hold on the thread for a short time to pull back the pressure.

    The throttledReqPerSecondMaxPauseMillis should be a value similar to this calculation: 1000 / maxReqPerSecond * 2.5 but should be a number less than 500. It is the amount of time that a thread will opportunistically wait for a guaranteed time slot to execute, if no time slot will be available it only waits the min pause and exits with error. The slots are known in advance, therefore no long pause happens when there is no chance of making it to a future slot.