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CI tests have been failing sporadically lately, more often than not. I'm pretty sure this is caused by the kernel's OOM killer, given this line in the log:
16/04/29 23:57:37.254 ContextLauncher-1: Child process exited with code 137.^M
That's a SIGKILL. We can look at a few things, including:
- lower memory settings for the test processes (currently -Xmx4g)
- lower memory settings for launched Spark processes (currently the default, 1g per process)
- switch to a larger env (see https://docs.travis-ci.com/user/ci-environment/, trusty provides ~7G).
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