GitHub user Leemoonsoo opened a pull request:
https://github.com/apache/incubator-zeppelin/pull/26
ZEPPELIN-22 PySparkInterpreter hanging without error message
When something goes wrong, like misconfiguring spark.home property,
%pyspark is hanging.
This PR makes Zeppelin prints some error instead of waiting forever.
Here's example of error message printed when it failed to load py4j
package. Previously it was just hanging.

You can merge this pull request into a Git repository by running:
$ git pull https://github.com/Leemoonsoo/incubator-zeppelin ZEPPELIN-22
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-zeppelin/pull/26.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 #26
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commit 59108255602f476d854d1e6e2291190101b80b0b
Author: Lee moon soo <[email protected]>
Date: 2015-04-03T04:54:28Z
ZEPPELIN-22 handle pyspark initialize error and print error message
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