Updated README.

Author: johannestang

README.md

@@ -2,12 +2,14 @@
 
 Big data stack running in pseudo-distributed mode with the following components:
 
- - Hadoop
- - Minio
- - Hive
- - Presto
- - Superset
- - Hue
+ - Hadoop 2.8.5
+ - Minio RELEASE.2018-12-27T18-33-08Z
+ - Hive 2.3.4
+ - Presto 0.215
+ - Superset 0.28.1
+ - Hue 4.3.0
+
+For more details see the following [post](https://johs.me/posts/big-data-stack-running-sql-queries/).
 
 ## Quick start
 
@@ -16,4 +18,41 @@ suitable directory (persistent storage for all containers). Bring up the stack:
 ```
 docker-compose up -d
 ```
+and initialize the databases for Superset and Hue:
+```
+./scripts/init-hue.sh
+./scripts/init-superset.sh
+```
+The stack should now be up and running and the following services available:
+
+ - Hadoop namenode: [http://localhost:50070](http://localhost:50070)
+ - Minio: [http://localhost:9000](http://localhost:9000)
+ - Presto: [http://localhost:8080](http://localhost:8080)
+ - Superset: [http://localhost:8088](http://localhost:8088)
+ - Hue: [http://localhost:8888](http://localhost:8888)
+
+## Contents
+
+The stack uses update/modified Docker images from [Big Data Europe](https://github.com/big-data-europe),
+ [shawnzhu](https://github.com/shawnzhu/docker-prestodb), and [Cloudera](https://github.com/cloudera/hue). See
+Dockerfiles for details.
+
+All needed images are on Docker Hub, but if you want to build the updated/modified images yourself, just run `build-local.sh`
+in the different sub-directories.
+
+Changes compared to original images:
+
+ - Hadoop updated to version 2.8.5
+ - Hive update to version 2.3.4
+ - S3 support added
+ - Presto update to 0.215
+ - Presto JDBC driver added to Hue
+
+The scripts directory contains some helper scripts:
+
+ - `beeline.sh`: Launch Beeline (Hive CLI) in Hive container 
+ - `hadoop-client.sh`: Start container with Hadoop utilities (host filesystem mounted as `/host`). Useful for moving files to HDFS.
+ - `init-hue.sh`: Initialize Hue database
+ - `init-superset.sh`: Initialize Superset database and add Presto as data source
+ - `presto-cli.sh`: Launch Presto CLI (downloads jar if needed)