What are the advantage and disadvantage of Loader compared with conventional ETL?


Compared with conventional Extract-Transform-Load (ETL), Loader has the following advantage and disadvantage:
1. Advantage:
Loader uses a MapReduce-based parallel computing architecture as the underlying architecture, which delivers a faster data processing speed than ETL.
2. Disadvantage:
Compared with ETL, Loader focuses more on the data import and export function of FusionInsight Hadoop and is weak in data conversion.

Other related questions:
What are the advantages of HBase compared with conventional databases
Advantages of HBase compared to conventional databases: 1. HBase uses the column-based storage mode. When multiple records are added, the data is stored by column. Conventional databases use the row-based storage mode. When multiple records are added, the data is read and stored by row. 2. HBase supports horizontal expansion, automatic splitting, and linear performance improvement. Conventional databases require manual configuration and are difficult to expand and maintain. 3. HBase performance remains unchanged when massive sets of data are concurrently read or written. In the same situation, conventional database performance drops dramatically. Conventional databases do, however, perform better in small-scale data read/write scenarios. 4. HBase data is stored in triplicate on HDFS, eliminating single points of failure and implementing cluster-level active/standby reliability. Conventional databases use active/standby mode to ensure reliability. 5. HBase supports dynamic expansion of columns while conventional databases do not. 6. CTBase in HBase supports correlation query and secondary indexing. Conventional databases only support basic conditional querying. 7. CTBase/Phoenix supports visual GUIs. Conventional databases use a visual query system. 8. HBase supports read/write permissions of tables and columns. Conventional databases only support basic rights control. 9. HBase is applicable to TB- and PB-level data, while conventional databases are not. Disadvantages of HBase compared to conventional databases: 10. HBase does not support simultaneous transaction authoring for multiple records. This means that data rollbacks need to be performed on related applications. Conventional databases support this function. 11. HBase only supports the character data type. Conventional databases support various data types.

What Are the Advantages and Disadvantages of FHSS and DSSS
The direct sequence spread spectrum (DSSS) technology has advantages in high-reliability applications, whereas the frequency hopping spread spectrum (FHSS) technology has advantages in low-cost applications. Generally, DSSS fast transmits data in full-band mode, and allows for a higher transmission frequency in the future. The DSSS technology applies to a fixed environment or applications requiring high transmission quality. Therefore, DSSS wireless products are usually used in wireless plants, wireless hospitals, network communities, and campus networking. The FHSS technology applies to the endpoints requiring fast mobility. Because the FHSS transmission range is small, more FHSS devices than DSSS devices are required in the same transmission environment, which requires a high cost.

What are advantages and disadvantages of direct forwarding and tunnel forwarding
Direct forwarding: Packets do not need to be encapsulated and decapsulated. Therefore, the forwarding efficiency is high, and it is easy for network administrators to locate faults. However, user packets may be intercepted during transmission, threatening information security. In addition, packets of service VLANs need to be transparently transmitted, which increases maintenance workload on the Layer 2 network between ACs and APs. Tunnel forwarding: Packets are encrypted using the Datagram Transport Layer Security (DTLS) protocol, which prevents attackers from intercepting packets transmitted on the network. Therefore, tunnel forwarding has a high security. The configuration is also simple because only packets of the management VLAN need to be transparently transmitted between APs and ACs. However, encrypted packets make fault location difficult. Moreover, the forwarding efficiency is lower than that in direct forwarding because data packets must be encapsulated with a CAPWAP header.

What are advantages and disadvantages of WAPI authentication
WLAN authentication and Privacy Infrastructure (WAPI) has three independent elements: STA, AP, and Authentication Service Unit (ASU), to ensure authentication security. Encryption keys are generated after negotiation. WAPI authentication uses the SMS4 algorithm and supports 802.1X authentication applying to a large-scale network. WAPI applies to scenarios requiring high security level. In WAPI authentication, the ASU server must check certificates, which requires support from STAs. Currently, a few STAs support WAPI. STA hardware needs to be upgraded to support WAPI. Software application is not widely used because of its low efficiency.

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