[jira] [Assigned] (SPARK-28149) Disable negeative DNS caching
[ https://issues.apache.org/jira/browse/SPARK-28149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Apache Spark reassigned SPARK-28149: Assignee: (was: Apache Spark) > 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 >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. > -- This message was sent by Atlassian JIRA (v7.6.3#76005) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org
[jira] [Assigned] (SPARK-28149) Disable negeative DNS caching
[ https://issues.apache.org/jira/browse/SPARK-28149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Apache Spark reassigned SPARK-28149: Assignee: Apache Spark > 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 >Assignee: Apache Spark >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. > -- This message was sent by Atlassian JIRA (v7.6.3#76005) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org
