Github user felixcheung commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/803#issuecomment-202604105
test failure was:
```
+tar zxf spark-1.3.1-bin-hadoop2.3.tgz
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now
[31;1mThe command "./testing/downloadSpark.sh 1.3.1 2.3" failed 3
times.[0m
```
Spark release download corruption/timeout.
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