GitHub user jasonxh opened a pull request:
https://github.com/apache/zeppelin/pull/1286
[ZEPPELIN-1294] Implement one-way sync for notebook repos
### What is this PR for?
Currently, if there are two notebook storages configured, the sync process
treats them equally and can pull changes from either storage. This can cause
confusions if there is a clear distinction between primary and secondary
storages, and the primary storage is managed outside of Zeppelin itself, such
as a local folder that's git controlled. If a notebook is deleted or reverted
to an older version in the primary storage behind Zeppelin's back, the sync
process will overwrite the change with data from the secondary storage, likely
against the user's intention.
The proposal is to enable the scenario with a one-way sync flag, where the
primary storage is treated as the only source of truth and the secondary
storage is merely a mirror of the primary.
### What type of PR is it?
Improvement
### Todos
### What is the Jira issue?
<https://issues.apache.org/jira/browse/ZEPPELIN-1294>
### How should this be tested?
1. Setup two notebook storages through `ZEPPELIN_NOTEBOOK_STORAGE`, with
the first is local file storage, i.e.
`org.apache.zeppelin.notebook.repo.VFSNotebookRepo`. The second storage can be
anything, e.g. `org.apache.zeppelin.notebook.repo.zeppelinhub.ZeppelinHubRepo`.
2. Add `export ZEPPELIN_NOTEBOOK_ONE_WAY_SYNC=true` to `zeppelin-env.sh`.
3. Start Zeppelin server.
4. Delete a notebook directly from the notebook folder.
5. Refresh notebooks from Zeppelin UI.
6. Observe from the secondary storage that the notebook has been deleted.
### Screenshots (if appropriate)
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? Documentation for the new flag has been
added to `install.md`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/optimizely/zeppelin hao/one-way-sync
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zeppelin/pull/1286.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1286
----
commit 566b0ed44541383079efeac0c8e754e549fa19cb
Author: Hao Xia <h...@optimizely.com>
Date: 2016-08-04T21:08:50Z
Implement one-way sync for notebook repos
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