Github user bzz commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/497#issuecomment-161514669
In 5d7ffea `.close()` lifecycle method was introduced for the
`NotebookRero` to cleanup the resources that storage implementation might have
occupied.
As this is an API change \cc @khalidhuseynov and @Leemoonsoo who worked on
this before, as I recall, to take a quick look.
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