Source code

git clone https://github.com/apache/kylin.git -b kylin-on-parquet-v2
# Compile 
mvn clean install -DskipTests

Environment on the dev machine

Install Maven

The latest maven can be found at http://maven.apache.org/download.cgi, we create a symbolic so that mvn can be run anywhere.

cd ~
wget http://xenia.sote.hu/ftp/mirrors/www.apache.org/maven/maven-3/3.2.5/binaries/apache-maven-3.2.5-bin.tar.gz
tar -xzvf apache-maven-3.2.5-bin.tar.gz
ln -s /root/apache-maven-3.2.5/bin/mvn /usr/bin/mvn

Install Spark

Manually install the Spark binary in in a local folder like /usr/local/spark. Kylin  support community version of Spark. You can go to apache spark official website and download spark2.4.6 .

How to Debug

There are two modes to debug source code : Debug with local metadata(recommend) and debug with hadoop sandbox.

Configuration

Debug with local metadata 

1. Edit the properties of $KYLIN_SOURCE_DIR/examples/test_case_data/sandbox/kylin.properties

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   VM options "-Dspark.local=true"   is for query engine.

Debug with Hadoop sandbox

Local configuration must be modified to point to your hadoop sandbox (or CLI) machine.

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An alternative to the host replacement is updating your hosts file to resolve sandbox and sandbox.hortonworks.com to the IP of your sandbox machine.

Launch Kylin Web Server

Copy server/src/main/webapp/WEB-INF to webapp/app/WEB-INF

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Check Kylin Web at http://localhost:7070/kylin (user:ADMIN, password:KYLIN)

Setup IDE code formatter

In case you’re writting code for Kylin, you should make sure that your code in expected formats.

For Eclipse users, just format the code before committing the code.

For intellij IDEA users, you have to do a few more steps:

1. Install “Eclipse Code Formatter” and use “org.eclipse.jdt.core.prefs” and “org.eclipse.jdt.ui.prefs” in core-common/.settings to configure “Eclipse Java Formatter config file” and “Import order”Image Removed

2. Go to Preference => Code Style => Java, set “Scheme” to Default, and set both “Class count to use import with ‘*’” and “Names count to use static import with ‘*’” to 99.Image Removed

3. Disable intellij IDEA’s “Optimize imports on the fly”Image Removed

4. Format the code before committing the code.

Setup IDE license header template

Each source file should include the following Apache License header

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.

The checkstyle plugin will check the header rule when packaging also. The license file locates under dev-support/checkstyle-apache-header.txt. To make it easy for developers, please add the header as Copyright Profile and set it as default for Kylin project.

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How to Package and Deploy

cd ${KYLIN_SOURCE_CODE}
# For HDP2.x
./build/script/package.sh

# For CDH5.7
./build/script/package.sh -P cdh5.7
# After finished, the package will be avaliable in the directory ${KYLIN_SOURCE_CODE}/dist/

# If running on HDP, you need to uncomment the following properties in kylin.properties
kylin.engine.spark-conf.spark.driver.extraJavaOptions=-Dhdp.version=current
kylin.engine.spark-conf.spark.yarn.am.extraJavaOptions=-Dhdp.version=current
kylin.engine.spark-conf.spark.executor.extraJavaOptions=-Dhdp.version=current

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