Github user felixcheung commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/727#issuecomment-189016612
Maybe pre-caching is the only way to make this more stable.. I have seen
more than a few times download fails even after 3 tries either from timing out
or partial/corrupted file
```
+tar zxf spark-1.4.1-bin-hadoop2.3.tgz
gzip: stdin: unexpected end of file
tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now
[31;1mThe command "./testing/downloadSpark.sh 1.4.1 2.3" failed 3
times.[0m
```
https://s3.amazonaws.com/archive.travis-ci.org/jobs/111662284/log.txt
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