What is SmallFS?

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The number of files that HDFS NameNode can manage is restricted by the node's heap memory. A large number of small files (more small files indicate less data blocks) generated during the use of services can rapidly consume NameNode memory and slow NameNode running.
A background small file merging feature (namely, SmallFS) is developed to solve this problem. SmallFS automatically detects small files in the system based on the file size threshold, merges them, and stores metadata to a local LevelDB to reduce the NameNode load. Moreover, it provides a new FileSystem interface for users to transparently access these small files.

Other related questions:
What is AS
Auto Scaling (AS) is a service that automatically adjusts resources based on your service requirements and configured AS policies. You can specify AS configurations and policies based on service requirements. These configurations and policies free you from repeatedly adjusting resources to keep up with service changes and demand peaks, which helps you reduce the required resources and workforce.

What is Beamforming
The beamforming or Transmit Beam Forming (TxBF) technology produces the strong directional radiation pattern based on the strong correlation of the spatial channel and wave interference principle, making the main lobe of the radiation pattern adaptive to point to the wave direction. This technology improves the SNR, system capacity, and coverage range. Beamforming or TxBF is an optional feature in the 802.11n standard. Beamforming includes explicit beamforming and implicit beamforming. Explicit beamforming requires the receive end to send information about the received signal to an AP. The AP then adjusts the transmit power to the optimal value according to the signal information. This function increases the SNR of the receive end and improves the receiving capability. Implicit beamforming allows an AP to automatically adjust the transmit power to increase the SNR of the receive end based on channel parameters without requiring the receive end to work with the AP. Currently, mainstream terminals do not support beamforming.

What is MIMO
Multiple input multiple output (MIMO) is an antenna system that consists of M transit antennas and N receive antennas. The MIMO technology allows spaces to become the resources used to improve performance and increases the coverage range of the wireless system. The MIMO system generates multiple spatial flows with each antenna generating a maximum of one spatial flow. The single in single out (SISO) system sends or receives one spatial flow (one copy of signals) at a time. The MIMO technology allows multiple antennas to send and receive multiple spatial flows (multiple copies of signals) simultaneously and to differentiate the signals sent to or received from different spaces. An 802.11n device supports up to 4x4 MIMO, a maximum of four spatial flows, with a rate of up to 600 Mbit/s.

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