jlpedrosa opened a new pull request #24962: [SPARK-28149][Kubernetes] Added variable to disable negative DNS caching URL: https://github.com/apache/spark/pull/24962 ## What changes were proposed in this pull request? This PR makes possible disable the negative dns caching in JVM by adding a variable. ## How was this patch tested? I could not see a place to run this tests automatically, so I run them manually by executing docker run: ``` josemsmac:spark jopedros$ docker run --rm -it --env "DISABLE_DNS_NEGATIVE_CACHING=1" spark:latest executor ++ id -u + myuid=185 ++ id -g + mygid=0 + set +e ++ getent passwd 185 + uidentry= + set -e + '[' -z '' ']' + '[' -w /etc/passwd ']' + echo '185:x:185:0:anonymous uid:/opt/spark:/bin/false' + SPARK_CLASSPATH=':/opt/spark/jars/*' + env + grep SPARK_JAVA_OPT_ + sort -t_ -k4 -n + sed 's/[^=]*=\(.*\)/\1/g' + readarray -t SPARK_EXECUTOR_JAVA_OPTS + '[' -n '' ']' + '[' '' == 2 ']' + '[' '' == 3 ']' + '[' -z ']' + case "$1" in + shift 1 + CMD=(${JAVA_HOME}/bin/java "${SPARK_EXECUTOR_JAVA_OPTS[@]}" -Xms$SPARK_EXECUTOR_MEMORY -Xmx$SPARK_EXECUTOR_MEMORY -cp "$SPARK_CLASSPATH") + '[' -z x ']' + 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 + CMD+=(-Djava.security.properties=${MOD_OPTS_PATH}) + CMD+=(org.apache.spark.executor.CoarseGrainedExecutorBackend --driver-url $SPARK_DRIVER_URL --executor-id $SPARK_EXECUTOR_ID --cores $SPARK_EXECUTOR_CORES --app-id $SPARK_APPLICATION_ID --hostname $SPARK_EXECUTOR_POD_IP) + exec /sbin/tini -s -- /usr/lib/jvm/java-1.8-openjdk/bin/java -Xms -Xmx -cp ':/opt/spark/jars/*' -Djava.security.properties=/tmp/jvm.java.security org.apache.spark.executor.CoarseGrainedExecutorBackend --driver-url --executor-id --cores --app-id --hostname ```
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