Use NM_HOST to determine hostname #97
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Some clusters have infiniband enabled, which may get picked up by `InetAddress` when determining the application-master hostname/IP. Infiniband is not currently supported by gRPC, so this would result in failures. Instead of trying to more robustly determine the IP for a supported network interface, we rely on the `NM_HOST` environment variable, which is always set and must resolve correctly on all nodes for hadoop to properly work.
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Some clusters have infiniband enabled, which may get picked up by
InetAddresswhen determining the application-master hostname/IP.Infiniband is not currently supported by gRPC, so this would result in
failures. Instead of trying to more robustly determine the IP for a
supported network interface, we rely on the
NM_HOSTenvironmentvariable, which is always set and must resolve correctly on all nodes
for hadoop to properly work.