Helping Hand Questions for H13-711_V3.0

ZKFC (ZKFailoverController) is used as a Zookeeper cluster client to monitor the status information of NameNodel

The ZKFC process needs to be deployed in NameNodel's node and Zookeeper's Leader node

Standby NameNodej perceives the status of Active NameNodel through Zookeeper. Once the Active NameNode is down, the Standby NameNode will perform the main upgrade operation.

The ZKFC of HDFS NameNodel connects to Zookeeper, and saves the host name and other information in Zookeeper

Flexible and convenient ETL

Only supports MapReduce computing engine

Direct access to HDFS files and HBase

Easy to use and easy to program

container

jar

application-attempt

Aapplication

High throughput application scenarios

Application scenarios requiring full ACD characteristics

Semi-structured data application scenarios

Mass data (TB, PB) application scenarios