GitHub user AlexanderShoshin opened a pull request:
https://github.com/apache/zeppelin/pull/2206
[ZEPPELIN-1856] Flaky Test:
InterpreterRestApiTest.testRestartInterpreterPerNote
### What is this PR for?
A _NullPointerException_ occurs occasionally in
`InterpreterRestApiTest.testRestartInterpreterPerNote()` test when
`p.getResult()` returns _null_ in the following line of test method:
```
assertEquals(p.getResult().message().get(0).getData(),
getSimulatedMarkdownResult("markdown"));
```
It happens when we recieve an _OUTPUT_UPDATE_ALL_ event in
_RemoteInterpreterEventPoller_ after `RemoteInterpreter.interpret(..)` is done.
The `Paragraph.result` which already contains its final value is setted to
_null_ by `NotebookServer.onOutputClear(..)` method. As a result we recieve a
_NPE_ in assertion.
### What type of PR is it?
Bug Fix
### Todos
* [ ] - To fix this issue we need to ignore an _OUTPUT_UPDATE_ALL_ event
after job is finished.
### What is the Jira issue?
[ZEPPELIN-1856](https://issues.apache.org/jira/browse/ZEPPELIN-1856)
### 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/AlexanderShoshin/zeppelin ZEPPELIN-1856
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zeppelin/pull/2206.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 #2206
----
commit bcf01bd999fc853e08058a77443153338f85c5d4
Author: Alexander Shoshin <alexander_shos...@epam.com>
Date: 2017-03-24T13:27:35Z
do not clear a paragraph output if the paragraph is already done
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