public Integer getNumClientThreads(String systemName) {
    return getInt(String.format(CONFIG_SYSTEM_NUM_CLIENT_THREADS, systemName), DEFAULT_CONFIG_SYSTEM_NUM_CLIENT_THREADS);
  }
Get the number of client threads, This is used to create the ThreadPool executor that is passed to the
{@link EventHubClient#createFromConnectionStringSync}
@param systemName Name of the system.
@return Num of client threads to use.
samza-azure/src/main/java/org/apache/samza/system/eventhub/EventHubConfig.java