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https://issues.apache.org/jira/browse/SPARK-28149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-28149:
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Affects Version/s: (was: 2.4.3)
3.0.0
> 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: 3.0.0
> Reporter: Jose Luis Pedrosa
> Priority: Minor
>
> 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.
>
> The proposed implementation would be to add to the entrypoint.sh (that is
> exclusive for k8s) to alter the file with the dns caching, and disable it if
> there's an environment variable as "DISABLE_DNS_NEGATIVE_CACHING" defined.
>
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