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Posted to issues@spark.apache.org by "Jose Luis Pedrosa (JIRA)" <ji...@apache.org> on 2019/06/24 17:10:00 UTC

[jira] [Created] (SPARK-28149) Disable negeative DNS caching.

Jose Luis Pedrosa created SPARK-28149:
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             Summary: Disable negeative DNS caching.
                 Key: SPARK-28149
                 URL: https://issues.apache.org/jira/browse/SPARK-28149
             Project: Spark
          Issue Type: Improvement
          Components: Kubernetes
    Affects Versions: 2.4.3
            Reporter: Jose Luis Pedrosa


By default JVM caches the failures for the DNS resolutions, by default is cached by 10 seconds.

Alpine JDK used in the images for kubernetes has a default timout of 5 seconds.

This means that in clusters with slow init time (network sidecar pods, slow network start up) executor will never run, because the first attempt to connect to the driver will fail, and that failure will be cached, causing  the retries to happen in a tight loop without actually trying again.

 

 



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