adoroszlai opened a new pull request #2415:
URL: https://github.com/apache/hadoop/pull/2415
## What changes were proposed in this pull request?
1. Update to Hadoop 3.3.0 release.
2. And some misc updates/improvements for the docker build:
* Use current Apache Rat 0.13 in `build.sh` as 0.12 is now available only
in archive.
* Add `.dockerignore` to speed up build (avoid sending `.git` etc. to the
Docker daemon).
* Let git ignore `build` dir (created by `build.sh`).
* Add some MapReduce-related env to docker config to allow running MR
examples.
https://issues.apache.org/jira/browse/HADOOP-17320
## How was this patch tested?
Built the new image locally:
```
$ ./build.sh
...
Successfully built 2adf1981fb31
Successfully tagged apache/hadoop:3
```
and tested it with the included sample Docker Compose cluster:
```
$ docker-compose up -d --scale datanode=3 --scale nodemanager=3
$ docker-compose exec resourcemanager yarn jar
/opt/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-3.3.0.jar pi 3 3
...
Job Finished in 26.524 seconds
Estimated value of Pi is 3.55555555555555555556
```
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