Github user felixcheung commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/697#issuecomment-185996538
it looks like this might have broken the build?
```
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR]
/home/travis/build/apache/incubator-zeppelin/zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/repo/AzureNotebookRepo.java:[43,8]
org.apache.zeppelin.notebook.repo.AzureNotebookRepo is not abstract and does
not override abstract method checkpoint(java.lang.String,java.lang.String) in
org.apache.zeppelin.notebook.repo.NotebookRepo
```
https://travis-ci.org/apache/incubator-zeppelin/builds/110268133
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