nwangtw opened a new pull request #3251: Check invalid number of container in round robin packing algorithm URL: https://github.com/apache/incubator-heron/pull/3251 Currently if number of containers is set to an invalid value, we get the following exception which is not ideal. ``` [2019-04-29 15:17:05 -0700] [FINE] org.apache.heron.scheduler.SubmitterMain: Exception when submitting topology java.lang.NullPointerException at org.apache.heron.packing.roundrobin.RoundRobinPacking.getRoundRobinAllocation(RoundRobinPacking.java:385) at org.apache.heron.packing.roundrobin.RoundRobinPacking.packInternal(RoundRobinPacking.java:149) ``` After the change, we would expect "Invlaid number of container: %d" runtime exception.
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