GitHub user zjffdu opened a pull request:
https://github.com/apache/zeppelin/pull/1795
ZEPPELIN-1851. LazyOpenInterpreter would open interpreter multiple times
when open fails
### What is this PR for?
Change `opened` to be `volatile` as it would be accessed by multiple
threads. And check `opened` in `getProgress` rather than call `open()`
### What type of PR is it?
[Bug Fix]
### Todos
* [ ] - Task
### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-1851
### How should this be tested?
Tested manually on livy interpreter (change the livy configuration to make
livy fails to create session).
### 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-1851
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zeppelin/pull/1795.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 #1795
----
commit e800932d9070e9c82b96802592ae4a6a0cfe0000
Author: Jeff Zhang <zjf...@apache.org>
Date: 2016-12-23T03:14:32Z
ZEPPELIN-1851. LazyOpenInterpreter would open interpreter multiple times
when open fails
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