Wang Qing 8e8e123777 [Java] Simplify Java worker configuration (#2938) ... ## What do these changes do? Previously, Java worker configuration is complicated, because it requires setting environment variables as well as command-line arguments. This PR aims to simplify Java worker's configuration. 1) Configuration management is now migrated to [lightbend config](https://github.com/lightbend/config), thus doesn't require setting environment variables. 2) Many unused config items are removed. 3) Provide a simple `example.conf` file, so users can get started quickly. 4) All possible options and their default values are declared and documented in `ray.default.conf` file. This PR also simplifies and refines the following code: 1) The process of `Ray.init()`. 2) `RunManager`. 3) `WorkerContext`. ### How to use this configuration? 1. Copy `example.conf` into your classpath and rename it to `ray.conf`. 2. Modify/add your configuration items. The all items are declared in `ray.default.conf`. 3. You can also set the items in java system prosperities. Note: configuration is read in this priority: System properties > `ray.conf` > `ray.default.conf` ## Related issue number N/A		2018-09-26 20:14:22 +08:00
..
src/main/java/org/ray/api	[Java] Simplify Java worker configuration (#2938)	2018-09-26 20:14:22 +08:00
pom.xml	[Java] Simplify Java worker configuration (#2938)	2018-09-26 20:14:22 +08:00