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Publishing Scala Packages to Nexus/Maven

Currently 3 Packages from the above generated are published to Maven. `mxnet_full_2.11-{platform}`.

The following flags are used to build the MXNet Backend(derived from mxnet pip compiler flags)

Building on OS-X

Setup GPG Keys https://www.apache.org/dev/openpgp.html#key-gen-install-latest-gnupg 

Export/Import GPG Keys

gpg --export-secret-keys -a xxx@apache.org > ~/Downloads/keys.asc
gpg --import /tmp/keys.asc
#list the keys to make sure they are there.
gpg --list-keys
#you will need this to enter your gpg-key password
sudo apt install gnupg-agent

Build MXNet backend on OSX

Clone MXNet repo and checkout the release branch

export YOURFORK=whatever
export RELEASE_VERISON=1.2.0
git clone https://github.com/$YOURFORK$/incubator-mxnet
git remote add upstream https://github.com/apache/incubator-mxnet
git fetch upstream $RELEASE_VERSION && git checkout -b $RELEASE_VERSION --track upstream/$RELEASE_VERSION

Install necessary libraries

brew install lapack
brew install openblas

Build MXNet Backend

brew install lapackbrew install openblas#This will build the MXNet backend with the tested configuration for publishing MXNet-Scala to Maven.
scala-package/dev/compile-mxnet-backend.sh osx-x86_64-cpu ./

Maven Publish

Follow Maven Publish Link https://www.apache.org/dev/publishing-maven-artifacts.html to setup repo settings, etc., before you proceed

#if you don't set this it will fail with the error "gpg: signing failed: Inappropriate ioctl for device"
export GPG_TTY=$(tty)

#make sure everything is working as expected
make scalarelease-dryrun
# Releases to Apache Snapshot
make scaladeploy 
# Verify that the package has been uploaded in https://repository.apache.org/content/repositories/snapshots/
# Preparing the release will create the new tag, automatically checking in on your behalf.(We have disabled CheckIn)
make scalarelease-prepare
# this will upload to the staging repository and make it ready for closing
make scalarelease-perform

Build MXNet backend on Linux-CPU

To build for linux-cpu platform, we use the AWS Deep Learning Base AMI that comes built with all the necessary 

libraries such as opencv/cudnn etc,.

Install Maven on Ubuntu

sudo apt-get install -y maven

setup all the flags

Note: compiling with USE_SIGNAL_HANDLER throws a segmentation fault on both OSX and Linux platforms

Debugging Info

[INFO] Stack trace returned 10 entries: [INFO] [bt] (0) /home/ubuntu/incubator-mxnet/scala-package/init-native/linux-x86_64/target/libmxnet-init-scala-linux-x86_64.so(dmlc::StackTrace[abi:cxx11]()+0x1bc) [0x7f0afcea735c] [INFO] [bt] (1) /home/ubuntu/incubator-mxnet/scala-package/init-native/linux-x86_64/target/libmxnet-init-scala-linux-x86_64.so(+0x2fc40af) [0x7f0aff99e0af] [INFO] [bt] (2) /lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7f0be3a204b0] [INFO] [bt] (3) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x8797bd) [0x7f0be0fed7bd] [INFO] [bt] (4) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x3dac73) [0x7f0be0b4ec73] [INFO] [bt] (5) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x40594d) [0x7f0be0b7994d] [INFO] [bt] (6) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x3ed3a0) [0x7f0be0b613a0] [INFO] [bt] (7) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x4047ac) [0x7f0be0b787ac] [INFO] [bt] (8) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x4032ce) [0x7f0be0b772ce] [INFO] [bt] (9) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x3de959) [0x7f0be0b52959] [INFO] Stack trace returned 10 entries: [INFO] [bt] (0) /home/ubuntu/incubator-mxnet/scala-package/init-native/linux-x86_64/target/libmxnet-init-scala-linux-x86_64.so(dmlc::StackTrace[abi:cxx11]()+0x1bc) [0x7f0afcea735c] [INFO] [bt] (1) /home/ubuntu/incubator-mxnet/scala-package/init-native/linux-x86_64/target/libmxnet-init-scala-linux-x86_64.so(+0x2fc40af) [0x7f0aff99e0af] [INFO] [bt] (2) /lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7f0be3a204b0] [INFO] [bt] (3) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x3dfe3a) [0x7f0be0b53e3a] [INFO] [bt] (4) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x323ac4) [0x7f0be0a97ac4] [INFO] [bt] (5) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x323e12) [0x7f0be0a97e12] [INFO] [bt] (6) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x324b07) [0x7f0be0a98b07] [INFO] [bt] (7) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x4768db) [0x7f0be0bea8db] [INFO] [bt] (8) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0x478717) [0x7f0be0bec717] [INFO] [bt] (9) /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so(+0xa12217) [0x7f0be1186217]

Testing with Intel MKL

Install instructions here: 

https://software.intel.com/en-us/articles/installing-intel-free-libs-and-python-apt-repo

USE_BLAS=mkl wget https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2019.PUB sudo apt-key add GPG-PUB-KEY-INTEL-SW-PRODUCTS-2019.PUB sudo wget https://apt.repos.intel.com/setup/intelproducts.list -O /etc/apt/sources.list.d/intelproducts.list sudo sh -c 'echo deb https://apt.repos.intel.com/mkl all main > /etc/apt/sources.list.d/intel-mkl.list' sudo apt-get update sudo apt-get install intel-mkl-2018.2-046

Failed with Segfault:

git push --force --delete ./ refs/heads/mxnet-parent_2.11-1.2.0
git tag -d mxnet-parent_2.11-1.2.0

If you face an issue because of gpg such as  ```Enter passphrase: gpg: gpg-agent is not available in this session```

sudo apt-get install gnupg2
sudo mv /usr/bin/gpg /usr/bin/gpg.1
sudo ln -s /usr/bin/gpg2 /usr/bin/gpg

gpg: signing failed: Inappropriate ioctl for device

```export GPG_TTY=$(tty)```

Note: compiling with USE_SIGNAL_HANDLER throws a segmentation fault on both OSX and Linux platforms

Publishing to Maven

export GPG_TTY=$(tty) make scalapkg make scalarelease-dryrun