Github user AhyoungRyu commented on the issue:
https://github.com/apache/zeppelin/pull/1227
CI failure with below error
```
Summary
-------
Generated at: 2016-07-25T16:46:38+00:00
Notes: 3
Binaries: 152
Archives: 0
Standards: 108
Apache Licensed: 106
Generated Documents: 0
JavaDocs are generated and so license header is optional
Generated files do not required license headers
2 Unknown Licenses
*******************************
Unapproved licenses:
scripts/docker/spark-cluster-managers/spark_standalone/Dockerfile
scripts/docker/spark-cluster-managers/spark_standalone/entrypoint.sh
```
It will be gone if you add apache license header to each docker files :)
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