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[SPARK-28149][K8S] Added variable to disable negative DNS caching #24962

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jlpedrosa wants to merge 1 commit into from
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[SPARK-28149][K8S] Added variable to disable negative DNS caching #24962

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13 changes: 12 additions & 1 deletion resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,18 @@ case "$1" in
-Xms$SPARK_EXECUTOR_MEMORY
-Xmx$SPARK_EXECUTOR_MEMORY
-cp "$SPARK_CLASSPATH"
org.apache.spark.executor.CoarseGrainedExecutorBackend
)

#Disable negative dns reslolution https://docs.oracle.com/javase/8/docs/technotes/guides/net/properties.html
if ! [ -z ${DISABLE_DNS_NEGATIVE_CACHING+x} ]; then
MOD_OPTS_PATH=/tmp/jvm.java.security
sed -e 's/networkaddress.cache.negative.ttl=10/networkaddress.cache.negative.ttl=0/g' \
/usr/lib/jvm/java-1.8-openjdk/jre/lib/security/java.security > ${MOD_OPTS_PATH}
CMD+=(-Djava.security.properties=${MOD_OPTS_PATH})
fi


CMD+=( org.apache.spark.executor.CoarseGrainedExecutorBackend
--driver-url $SPARK_DRIVER_URL
--executor-id $SPARK_EXECUTOR_ID
--cores $SPARK_EXECUTOR_CORES
Expand Down