LOG.info("Connecting to JobManager at: " + jobManagerAddress);
// Create RPC connections to the JobManager
JobManagerProtocol jobManager = null;
InputSplitProviderProtocol splitProvider = null;
ChannelLookupProtocol channelLookup = null;
AccumulatorProtocol accumulators = null;
// try/finally block to close proxies if anything goes wrong
boolean success = false;