Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/1639
@felizbear After you modified maven options, heap was increase
```
// before
[INFO] Zeppelin: Server ................................... SUCCESS [
12.294 s]
[INFO] Zeppelin: Packaging distribution ................... SKIPPED
[INFO] Zeppelin: R Interpreter ............................ SKIPPED
[INFO] Zeppelin: Scalding interpreter ..................... SKIPPED
[INFO] Zeppelin: Beam interpreter ......................... SKIPPED
[INFO] Zeppelin: Examples ................................. SKIPPED
[INFO] Zeppelin: Example application - Clock .............. SKIPPED
[INFO] Zeppelin: Example application - Horizontal Bar chart SKIPPED
[INFO]
------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO]
------------------------------------------------------------------------
[INFO] Total time: 09:15 min
[INFO] Finished at: 2016-11-16T03:58:06+00:00
[INFO] Final Memory: 169M/457M
[INFO]
------------------------------------------------------------------------
[ERROR] Java heap space -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions,
please read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/OutOfMemoryError
// after
[INFO] Zeppelin: BigQuery interpreter ..................... SUCCESS [
0.870 s]
[INFO] Zeppelin: Alluxio interpreter ...................... SUCCESS [
2.634 s]
[INFO] Zeppelin: Scio ..................................... SUCCESS [
40.645 s]
[INFO] Zeppelin: web Application .......................... SKIPPED
[INFO] Zeppelin: Server ................................... SKIPPED
[INFO] Zeppelin: Packaging distribution ................... SKIPPED
[INFO] Zeppelin: Examples ................................. SKIPPED
[INFO] Zeppelin: Example application - Clock .............. SKIPPED
[INFO] Zeppelin: Example application - Horizontal Bar chart SKIPPED
[INFO]
------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO]
------------------------------------------------------------------------
[INFO] Total time: 07:10 min
[INFO] Finished at: 2016-11-18T06:19:37+00:00
[INFO] Final Memory: 167M/1903M
[INFO]
------------------------------------------------------------------------
[ERROR] PermGen space -> [Help 1]
```
But now PermGen is not enough. I guess, it is because of too large heap
size since each travis build has memory limitation.
So what about decrease heap size (but more than `457M`)?
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