GitHub user bzz opened a pull request:
https://github.com/apache/zeppelin/pull/1033
Python: fix for 'run all' paragraphs
### What is this PR for?
Switch to FIFO scheduler as in current implementation `.interpret()` is not
thread-safe and so in parallel one 'Run All' fails some paragraphs with NPE in
logs
### What type of PR is it?
Bug Fix | Improvement
### How should this be tested?
'Run All' passes without NPE in logs i.e on this [Zeppelin notebook for
python](https://www.zeppelinhub.com/viewer/notebooks/aHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL2J6ei9pbmN1YmF0b3ItemVwcGVsaW4vMTkyZjU3YjZjMGZkMjc4NzgwZDI3NDAzMGY1YmJlOTZlZThkNzdiYi9ub3RlYm9vay8yQlFBMzVDSlovbm90ZS5qc29u)
### 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/bzz/incubator-zeppelin fix/python-run-all
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zeppelin/pull/1033.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 #1033
----
commit 72e9d62406b8525ac81deef7a04165be03441e02
Author: Alexander Bezzubov <b...@apache.org>
Date: 2016-06-17T04:59:50Z
Python: switch to FIFO scheduler
In current implementation `.interpret()` is not thread-safe and so in
parallel one (esp on empty or graph paragraphs) 'Run All' fails with NPE in
logs
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