some subtle fail with test_parse_manyfiles_fvec.py. Just one gz file, but 2 or 3 jvms. Doesn't always fail
+                                  java.util.concurrent.ExecutionException: java.lang.NullPointerException
+                                   at jsr166y.ForkJoinTask.get(ForkJoinTask.java:961)
+                                   at water.Futures.blockForPending(Futures.java:67)
+                                   at water.fvec.Frame.vecs(Frame.java:83)
+                                   at water.Value.isRawData(Value.java:244)
+                                   at water.api.Parse$ExistingCSVKey.parse(Parse.java:90)
+                                   at water.api.Parse$ExistingCSVKey.parse(Parse.java:65)
+                                   at water.api.RequestArguments$Argument.check(RequestArguments.java:546)
Merge branch 'master' of github.com:0xdata/h2o