[GitHub] zeppelin pull request #2622: ZEPPELIN-2990. Matplotlib sometimes fails in IP...

[asfgit]

Github user asfgit closed the pull request at:

https://github.com/apache/zeppelin/pull/2622


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[GitHub] zeppelin pull request #2622: ZEPPELIN-2990. Matplotlib sometimes fails in IP...

[zjffdu]

GitHub user zjffdu opened a pull request:

https://github.com/apache/zeppelin/pull/2622

ZEPPELIN-2990. Matplotlib sometimes fails in IPythonInterpreter

### What is this PR for?
Trivial fix for matplotlib fail in `IPythonInterpreter`. Besides that, I 
also make some minor changes on zeppelin code to improve logging. 

### What type of PR is it?
[Bug Fix]

### Todos
* [ ] - Task

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-2990


### How should this be tested?
UT is added.

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No


You can merge this pull request into a Git repository by running:

$ git pull https://github.com/zjffdu/zeppelin ZEPPELIN-2990

Alternatively you can review and apply these changes as the patch at:

https://github.com/apache/zeppelin/pull/2622.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 #2622


commit 8f696cd4274cc15b700e8b86879e48747e227637
Author: Jeff Zhang 
Date:   2017-10-13T07:41:01Z

ZEPPELIN-2990. Matplotlib sometimes fails in IPythonInterpreter




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