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# Here are some JVM args that are extremely useful in production when things go wrong
-XX:+G1SummarizeRSetStats
-XX:G1SummarizeRSetStatsPeriod=10
-XX:+PrintAdaptiveSizePolicy
-XX:+PrintJNIGCStalls
-XX:+PrintReferenceGC
-XX:+PrintGCCause
-XX:+PrintGCDateStamps
-XX:+PrintGCTimeStamps
-XX:+PrintGCDetails

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# To regenerate the test key and certificates

# Generate an RSA private key and convert it to PKCS8 wraped in PEM
openssl genrsa 2048 | openssl pkcs8 -topk8 -inform pem -outform pem -nocrypt -out rsa.key
# Generate a certificate signing request with the private key
openssl req -new -key rsa.key -out rsa.csr
# Sign request with private key
openssl x509 -req -days 10000 -in rsa.csr -signkey rsa.key -out rsa.crt

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Certificates

CA and trust keystore

keytool -genkeypair -keyalg RSA -keysize 2048 -validity 365 -alias ca -dname "CN=ca,O=HMS,S=SE" -keystore ca.jks -storepass password
keytool -exportcert -rfc -alias ca -keystore ca.jks -storepass password > ca.pem
cat ca.pem | keytool -importcert -alias ca -noprompt -keystore trust.jks -storepass password

server cert

findepi

1. Intellij Preferences > Live Templates > group other
2. Add a new one with
   • abbreviation rnn
   • Description requireNonNull
   • Template text java.util.Objects.requireNonNull($var$, "$var$ is null")
   • Applicable contexts: Java > Expression
   • check use static imports if possible

• Edit variables button and there add var variable with variableOfType("Object") expression

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mvn clean release:clean && mvn release:prepare

# `env GPG_TTY=$(tty)` may help with some sort of GPG problems
mvn release:perform

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full build, like mvn install

# See knownSparkVersions in gradle.properties for current list Spark versions
./gradlew -DsparkVersions=2.4,3.0,3.1,3.2,3.3 -x test -x integrationTest build publishToMavenLocal

# ... or pull the list automatically
./gradlew -DsparkVersions=$(sed -n 's/^systemProp.knownSparkVersions=//p' gradle.properties) \
    -x test -x integrationTest build publishToMavenLocal

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# store as docky/Dockerfile to match references in the other script

FROM ubuntu:latest

RUN true && \
        export DEBIAN_FRONTEND=noninteractive && \
        apt-get update && \
        apt-get install -y openssl && \
        apt-get clean && \
        echo OK