[FLINK-23756] Update FrocksDB release document with more info

Also make some slight improvements to the Maven upload script.

FROCKSDB-RELEASE.md

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+# FRocksDB Release Process
+
+## Summary
+
+FrocksDB-6.x releases are a fat jar file that contain the following binaries:
+* .so files for linux32 (glibc and musl-libc)
+* .so files for linux64 (glibc and musl-libc)
+* .so files for linux [aarch64](https://en.wikipedia.org/wiki/AArch64) (glibc and musl-libc)
+* .so files for linux [ppc64le](https://en.wikipedia.org/wiki/Ppc64le) (glibc and musl-libc)
+* .jnilib file for Mac OSX
+* .dll for Windows x64
+
+To build the binaries for a FrocksDB release, building on native architectures is advised. Building the binaries for ppc64le and aarch64 *can* be done using QEMU, but you may run into emulation bugs and the build times will be dramatically slower (up to x20).
+
+We recommend building the binaries on environments with at least 4 cores, 16GB RAM and 40GB of storage. The following environments are recommended for use in the build process:
+* Windows x64
+* Linux aarch64
+* Linux ppc64le
+* Mac OSX
+
+## Build for Windows
+
+For the Windows binary build, we recommend using a base [AWS Windows EC2 instance](https://aws.amazon.com/windows/products/ec2/) with 4 cores, 16GB RAM, 40GB storage for the build.
+
+Firstly, install [chocolatey](https://chocolatey.org/install). Once installed, the following required components can be installed using Powershell:
+
+    choco install git.install jdk8 maven visualstudio2017community visualstudio2017-workload-nativedesktop
+
+Open the "Developer Command Prompt for VS 2017" and run the following commands:
+
+    git clone [email protected]:ververica/frocksdb.git
+    cd frocksdb
+    git checkout FRocksDB-6.20.3 # release branch
+    java\crossbuild\build-win.bat
+
+The resulting native binary will be built and available at `build\java\Release\rocksdbjni-shared.dll`. You can also find it under project folder with name `librocksdbjni-win64.dll`.
+The result windows jar is `build\java\rocksdbjni_classes.jar`.
+
+There is also a how-to in CMakeLists.txt.
+
+**Once finished, extract the `librocksdbjni-win64.dll` from the build environment. You will need this .dll in the final crossbuild.**
+
+## Build for aarch64
+
+For the Linux aarch64 binary build, we recommend using a base [AWS Ubuntu Server 20.04 LTS EC2](https://aws.amazon.com/windows/products/ec2/) with a 4 core Arm processor, 16GB RAM, 40GB storage for the build. You can also attempt to build with QEMU on a non-aarch64 processor, but you may run into emulation bugs and very long build times.
+
+### Building in aarch64 environment
+
+First, install the required packages such as Java 8 and make:
+
+     sudo apt-get update
+     sudo apt-get install build-essential openjdk-8-jdk
+
+then, install and setup [Docker](https://docs.docker.com/engine/install/ubuntu/):
+
+     sudo apt-get install apt-transport-https ca-certificates curl gnupg lsb-release
+
+     curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
+     echo "deb [arch=arm64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+
+     sudo apt-get update
+     sudo apt-get install docker-ce docker-ce-cli containerd.io
+
+     sudo groupadd docker
+     sudo usermod -aG docker $USER
+     newgrp docker
+
+Then, clone the FrocksDB repo:
+
+     git clone https://github.com/ververica/frocksdb.git
+     cd frocksdb
+     git checkout FRocksDB-6.20.3 # release branch
+
+
+First, build the glibc binary:
+
+    make jclean clean rocksdbjavastaticdockerarm64v8
+
+**Once finished, extract the `java/target/librocksdbjni-linux-aarch64.so` from the build environment. You will need this .so in the final crossbuild.**
+
+Next, build the musl-libc binary:
+
+     make jclean clean rocksdbjavastaticdockerarm64v8musl
+
+**Once finished, extract the `java/target/librocksdbjni-linux-aarch64-musl.so` from the build environment. You will need this .so in the final crossbuild.**
+
+### Building via QEMU
+
+You can use QEMU on, for example, an `x86_64` system to build the aarch64 binaries. To set this up on an Ubuntu envirnment:
+
+    sudo apt-get install qemu binfmt-support qemu-user-static
+    docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+
+To verify that you can now run aarch64 docker images:
+
+    docker run --rm -t arm64v8/ubuntu uname -m
+    > aarch64
+
+You can now attempt to build the aarch64 binaries as in the previous section.
+
+## Build in PPC64LE
+
+For the ppc64le binaries, we recommend building on a PowerPC machine if possible, as it can be tricky to spin up a ppc64le cloud environment. However, if a PowerPC machine is not available, [Travis-CI](https://www.travis-ci.com/) offers ppc64le build environments that work perfectly for building these binaries. If neither a machine or Travis are an option, you can use QEMU but the build may take a very long time and be prone to emulation errors.
+
+### Building in ppc64le environment
+
+As with the aarch64 environment, the ppc64le environment will require Java 8, Docker and build-essentials installed. Once installed, you can build the 2 binaries:
+
+    make jclean clean rocksdbjavastaticdockerppc64le
+
+**Once finished, extract the `java/target/librocksdbjni-linux-ppc64le.so` from the build environment. You will need this .so in the final crossbuild.**
+
+    make jclean clean rocksdbjavastaticdockerppc64lemusl
+
+**Once finished, extract the `java/target/librocksdbjni-linux-ppc64le-musl.so` from the build environment. You will need this .so in the final crossbuild.**
+
+### Building via Travis
+
+Travis-CI supports ppc64le build environments, and this can be a convienient way of building in the absence of a PowerPC machine. Assuming that you have an S3 bucket called **my-frocksdb-release-artifacts**, the following Travis configuration will build the release artifacts and push them to the S3 bucket:
+
+```
+dist: xenial
+language: cpp
+os:
+  - linux
+arch:
+  - ppc64le
+
+services:
+  - docker
+addons:
+  artifacts:
+    paths:
+      - $TRAVIS_BUILD_DIR/java/target/librocksdbjni-linux-ppc64le-musl.so
+      - $TRAVIS_BUILD_DIR/java/target/librocksdbjni-linux-ppc64le.so
+
+env:
+  global:
+    - ARTIFACTS_BUCKET=my-rocksdb-release-artifacts
+  jobs:
+    - CMD=rocksdbjavastaticdockerppc64le
+    - CMD=rocksdbjavastaticdockerppc64lemusl
+
+install:
+  - sudo apt-get install -y openjdk-8-jdk || exit $?
+  - export PATH=/usr/lib/jvm/java-8-openjdk-$(dpkg --print-architecture)/bin:$PATH
+  - export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-$(dpkg --print-architecture)
+  - echo "JAVA_HOME=${JAVA_HOME}"
+  - which java && java -version
+  - which javac && javac -version
+
+script:
+  - make jclean clean $CMD
+```
+
+**Make sure to set the `ARTIFACTS_KEY` and `ARTIFACTS_SECRET` environment variables in the Travis Job with valid AWS credentials to access the S3 bucket you defined.**
+
+**Once finished, the`librocksdbjni-linux-ppce64le.so` and `librocksdbjni-linux-ppce64le-musl.so` binaries will be in the S3 bucket. You will need these .so binaries in the final crossbuild.**
+
+
+### Building via QEMU
+
+You can use QEMU on, for example, an `x86_64` system to build the ppc64le binaries. To set this up on an Ubuntu envirnment:
+
+    sudo apt-get install qemu binfmt-support qemu-user-static
+    docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+
+To verify that you can now run ppc64le docker images:
+
+    docker run --rm -t ppc64le/ubuntu uname -m
+    > ppc64le
+
+You can now attempt to build the ppc64le binaries as in the previous section.
+
+## Final crossbuild in Mac OSX
+
+Documentation for the final crossbuild for Mac OSX and Linux is described in [java/RELEASE.md](java/RELEASE.md) as has information on dependencies that should be installed. As above, this tends to be Java 8, build-essentials and Docker.
+
+Before you run this step, you should have 5 binaries from the previous build steps:
+
+ 1. `librocksdbjni-win64.dll` from the Windows build step.
+ 2. `librocksdbjni-linux-aarch64.so` from the aarch64 build step.
+ 3. `librocksdbjni-linux-aarch64-musl.so` from the aarch64 build step.
+ 3. `librocksdbjni-linux-ppc64le.so` from the ppc64le build step.
+ 4. `librocksdbjni-linux-ppc64le-musl.so` from the ppc64le build step.
+
+To start the crossbuild within a Mac OSX environment:
+
+    make jclean clean
+    mkdir -p java/target
+    cp <path-to-windows-dll>/librocksdbjni-win64.dll java/target/librocksdbjni-win64.dll
+    cp <path-to-ppc64le-lib-so>/librocksdbjni-linux-ppc64le.so java/target/librocksdbjni-linux-ppc64le.so
+    cp <path-to-ppc64le-musl-lib-so>/librocksdbjni-linux-ppc64le-musl.so java/target/librocksdbjni-linux-ppc64le-musl.so
+    cp <path-to-arm-lib-so>/librocksdbjni-linux-aarch64.so java/target/librocksdbjni-linux-aarch64.so
+    cp <path-to-arm-musl-lib-so>/librocksdbjni-linux-aarch64-musl.so java/target/librocksdbjni-linux-aarch64-musl.so
+    FROCKSDB_VERSION=1.0 PORTABLE=1 ROCKSDB_DISABLE_JEMALLOC=true DEBUG_LEVEL=0 make frocksdbjavastaticreleasedocker
+
+*Note, we disable jemalloc on mac due to https://github.com/facebook/rocksdb/issues/5787*.
+
+Once finished, there should be a directory at `java/target/frocksdb-release` with the FRocksDB jar, javadoc jar, sources jar and pom in it. You can inspect the jar file and ensure that contains the binaries, history file, etc:
+
+```
+$ jar tf frocksdbjni-6.20.3-ververica-1.0.jar
+META-INF/
+META-INF/MANIFEST.MF
+HISTORY-JAVA.md
+HISTORY.md
+librocksdbjni-linux-aarch64-musl.so
+librocksdbjni-linux-aarch64.so
+librocksdbjni-linux-ppc64le-musl.so
+librocksdbjni-linux-ppc64le.so
+librocksdbjni-linux32-musl.so
+librocksdbjni-linux32.so
+librocksdbjni-linux64-musl.so
+librocksdbjni-linux64.so
+librocksdbjni-osx.jnilib
+librocksdbjni-win64.dl
+...
+```
+
+*Note that it contains linux32/64.so binaries as well as librocksdbjni-osx.jnilib*.
+
+## Push to Maven Central
+
+For this step, you will need the following:
+
+- The OSX Crossbuild artifacts built in `java/target/frocksdb-release` as above.
+- A Sonatype account with access to the staging repository. If you do not have permission, open a ticket with Sonatype, [such as this one](https://issues.sonatype.org/browse/OSSRH-72185).
+- A GPG key to sign the release, with your public key available for verification (for example, by uploading it to https://keys.openpgp.org/)
+
+To upload the release to the Sonatype staging repository:
+```bash
+VERSION=<release version> \
+USER=<sonatype user> \
+PASSWORD=<sonatype password> \
+KEYNAME=<gpg key name> \
+PASSPHRASE=<gpg key passphrase> \
+java/publish-frocksdbjni.sh
+```
+
+Go to the staging repositories on Sonatype:
+
+https://oss.sonatype.org/#stagingRepositories
+
+Select the open staging repository and click on "Close".
+
+The staging repository will look something like  `https://oss.sonatype.org/content/repositories/xxxx-1020`. You can use this staged release to test the artifacts and ensure they are correct.
+
+Once you have verified the artifacts are correct, press the "Release" button. **WARNING: this can not be undone**. Within 24-48 hours, the artifact will be available on Maven Central for use.

java/publish-frocksdbjni.sh

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+#!/usr/bin/env bash
+################################################################################
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+################################################################################
+
+# fail on errors
+set -e
+
+PREFIX=java/target/frocksdb-release/frocksdbjni-${VERSION}
+
+function deploy() {
+  FILE=$1
+  CLASSIFIER=$2
+  echo "Deploying file=${FILE} with classifier=${CLASSIFIER} to sonatype with prefix=${PREFIX}"
+  sonatype_user="${USER}" sonatype_pw="${PASSWORD}" mvn gpg:sign-and-deploy-file \
+   --settings java/deploysettings.xml \
+   -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ \
+   -DrepositoryId=sonatype-nexus-staging \
+   -DpomFile=${PREFIX}.pom \
+   -Dfile=$FILE \
+   -Dclassifier=$CLASSIFIER \
+   -Dgpg.keyname="${KEYNAME}"  \
+   -Dgpg.passphrase="${PASSPHRASE}"
+}
+
+PREFIX=java/target/frocksdb-release/frocksdbjni-${VERSION}
+
+deploy ${PREFIX}-sources.jar sources
+deploy ${PREFIX}-javadoc.jar javadoc
+deploy ${PREFIX}.jar